aLIGO LHO Logbook https://www-alog1.ligo-wa.caltech.edu/aLOG/ General logbook for aLIGO activities en-us Tue, 14 Oct 2025 17:55:38 -0700 H1 PSL - ISS array grounding issue (Rahul, Keita) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87477 <p>Author: keita.kawabe@ligo.org</p><p>Report ID: 87477</p><p>First attachment is a screenshot of&nbsp;<a href="http://dcc.ligo.org/D1300130">D1300130</a>&nbsp;ISS array PD assembly (which is somehow called &quot;PSL PDD MODULE&quot;).</p> <p>Each PD (part #8) is entirely retained in an aluminum cylinder called the PDD main photodiode mount (part #9) and therefore the can of the PD is conductive to the cylinder. However, the cylinder is supposed to be isolated from the ISS array plate (and therefore the entire ISS array structure) by two pieces of kapton insulators (part #10). PCB assembly, which is connected to the PD, is sandwiched between two aluminum clamps (part #2 &quot;PDD clamp&quot; and part #11 &quot;Clamping plate&quot;, which I refer to the bottom and&nbsp;the top clamp respectively), but the PCB ground is isolated from the clamps by an insulator ring (part &quot;7?&quot;).</p> <p>This way ground loop is broken even though the can of the PD is connected to the shield of two SMP coax cables on the PCB board (part #1).</p> <p>Rahul and I checked the continuity between the cylinder and the ISS array cage. (Note that this check could not be done without disconnecting all SMP cables from the preamp first, because the preamp&#39;s ground is somehow connected to the optics table, which is connected to the ISS array cage.)</p> <p><strong>Issues found on the installation spare:</strong></p> <p>Unfortunately two of the PDs on the first floor (PD 5 and 6 in our notation in the lab, see the 2nd picture for the notation even though that is the picture of the 3IFO unit) didn&#39;t pass the check.</p> <p>We also checked the grounding of the QPD and it was good.</p> <p><strong>Inspecting 3IFO, finding the same issue, and fixing it:</strong></p> <p>We quickly checked the 3IFO unit too and found that it also had a grounding issue for one of the PDs (PD 2). In the 2nd attachment, you can see that the space between the top and the bottom clamp of PD2 is smaller than the others.</p> <p>We removed the top clamp and found no insulator (3rd attachment). We disconnected the PCB from the PD and learned that:</p> <ol> <li>Disconnecting the PCB won&#39;t change the PD position. PD is somehow firmly attached to the main photodiode mount, and it won&#39;t shift unless we loosen the bottom clamp.&nbsp;</li> <li>The insulator was found on the other side of the PCB, between the PCB assy and the PEEK pin guide (part #4).</li> <li>Installing the insulator on the correct side (4th attachment) and reinstalling the top clamp, the grounding was broken.</li> </ol> <p><strong>Fixing the issue on the installation spare:</strong></p> <p>With the new knowledge about the insulator, we looked at the gap between the top and the bottom clamps of the PDs for the installation spare unit and it looked like PD5, 6, 7 had the insulator on the wrong side of the PCB even though PD7 didn&#39;t have the grounding issue.</p> <p>Sure enough, we removed the top clamp for these problematic PDs, found no insulator for any of these (5th attachment), removed the PCB and found the insulator on the wrong side (6th attachment shows you one example), installed them correctly and the grounding problem was gone.</p> <p><strong>Electrical test:</strong></p> <p>Since we have disconnected the PCB and reconnected to the PDs, we reconnected all of the PDs to the preamp again and confirmed that all PDs still respond to the light as they used to.</p> <p>We haven&#39;t measured if any one of these are much noisier than the others, which we&#39;ll check later.</p> <!--- Output file_1_87477 div --> <div id="file_1_87477" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87477 div --> </div> <!--- Output files_1_87477 div --> <div id="files_1_87477" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87477_20251014165657_Screenshot2025-10-14at164910.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87477_20251014165657_Screenshot2025-10-14at164910.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87477_20251014174429_3IFO_unit.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87477_20251014174429_3IFO_unit.jpg" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87477_20251014174519_3IFO_PD2_NoInsulation.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87477_20251014174519_3IFO_PD2_NoInsulation.jpg" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87477_20251014174610_3IFO_PD2_InsulatorInstalled.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87477_20251014174610_3IFO_PD2_InsulatorInstalled.jpg" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87477_20251014174658_H1spare_PD567_NoInsulation.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87477_20251014174658_H1spare_PD567_NoInsulation.jpg" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87477_20251014174740_InsulatorOnTheWrongSide.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87477_20251014174740_InsulatorOnTheWrongSide.jpg" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87477 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87477 keita.kawabe@ligo.org Tue, 14 Oct 2025 17:55:38 -0700 H1 PSL H1 SUS - Weekly In-Lock SUS Charge Measurement FAMIS https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87482 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87482</p><p>Closes&nbsp;<a href="https://ligo-wa.accruent.net/LB_Request_UpdateElevate.asp?RequestID=28427">FAMIS#28427</a>, last checked&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87380">87380</a></p> <p>ITMX had too low of coherence again this week so it didn&#39;t run. Everyone else is looking normal.</p> <p><a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173628_ETMX.png" target="blank">ETMX</a></p> <p><a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173631_ETMY.png" target="blank">ETMY</a></p> <p><a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173634_ITMX.png" target="blank">ITMX</a></p> <p><a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173638_ITMY.png" target="blank">ITMY</a></p> <!--- Output file_1_87482 div --> <div id="file_1_87482" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87482 div --> </div> <!--- Output files_1_87482 div --> <div id="files_1_87482" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173628_ETMX.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87482_20251014173628_ETMX.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173631_ETMY.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87482_20251014173631_ETMY.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173634_ITMX.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87482_20251014173634_ITMX.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87482_20251014173638_ITMY.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87482_20251014173638_ITMY.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87482 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87482 oli.patane@ligo.org Tue, 14 Oct 2025 17:37:02 -0700 H1 SUS H1 SUS - Comment to Sat Amps Modified: L2 (PUM) Stages for ETMX, ETMY, ITMX, and ITMY https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87481 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87481</p><p>Here&#39;s the characterization data and fit results for <a href="https://dcc.ligo.org/LIGO-S1100148">S1100148</a>, assigned to ITMY L2&#39;s ULLLURLR OSEMs.</p> <p>This sat amp is a UK 4CH sat amp, <a href="https://dcc.ligo.org/LIGO-D0900900">D0900900</a> / <a href="https://dcc.ligo.org/LIGO-D0901284">D0901284</a>. The data was taken per methods described in <a href="https://dcc.ligo.org/LIGO-T080062-v3">T080062-v3</a>, using the diagrammatic setup shown on PAGE 1 of the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/86807_20250909120059_SatAmp_PDTransimpedance_FreqResp_MeasurementDiagrams.pdf">Measurement Diagrams</a> from <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86807">LHO:86807</a>.</p> <p>The data was processed and fit using <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/</a><br /> plotresponse_S1100148_ITMY_L2_ULLLURLR_20250917.m</p> <p>Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:</p> <table border="0"> <tbody> <tr> <th><tt>Optic&nbsp;</tt></th> <th><tt>Stage&nbsp;</tt></th> <th><tt>Serial_Number&nbsp;</tt></th> <th><tt>Channel_Number&nbsp;</tt></th> <th><tt>OSEM_Name&nbsp;</tt></th> <th><tt>Zero_Pole_Hz&nbsp;</tt></th> <th><tt>R_TIA_kOhm&nbsp;</tt></th> <th><tt>Foton_Design&nbsp;</tt></th> </tr> <tr> <td><tt>ITMY</tt></td> <td><tt>L2</tt></td> <td><tt>S1100148</tt></td> <td><tt>CH1</tt></td> <td><tt>UL</tt></td> <td><tt>0.095:5.19</tt></td> <td><tt>120.5</tt></td> <td><tt>zpk([5.19],[0.095],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH2</tt></td> <td><tt>LL</tt></td> <td><tt>0.0957:5.24</tt></td> <td><tt>120.0</tt></td> <td><tt>zpk([5.24],[0.0957],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH3</tt></td> <td><tt>UR</tt></td> <td><tt>0.0958:5.24</tt></td> <td><tt>120.125</tt></td> <td><tt>zpk([5.24],[0.0958],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH4</tt></td> <td><tt>LR</tt></td> <td><tt>0.0967:5.28</tt></td> <td><tt>120.375</tt></td> <td><tt>zpk([5.28],[0.0967],1,&quot;n&quot;)</tt></td> </tr> </tbody> </table> <p>The attached plot and machine readable .txt file version of the above table are also found in <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/</a><br /> 2025-09-17_UKSatAmp_S1100148_D0901284-v5_fitresults.txt</p> <p>Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from <a href="https://dcc.ligo.org/LIGO-G2501621">G2501621</a>, a la what was done for PR3 and SR3 top masses in <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86222">LHO:86222</a> and <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=84531">LHO:84531</a> respectively.</p> <!--- Output file_0_87481 div --> <div id="file_0_87481" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87481 div --> </div> <!--- Output files_0_87481 div --> <div id="files_0_87481" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87481_20251014172205_2025-09-17_UKSatAmp_S1100148_D0901284-v5.pdf" target="blank">2025-09-17_UKSatAmp_S1100148_D0901284-v5.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87481 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87481 oli.patane@ligo.org Tue, 14 Oct 2025 17:22:19 -0700 H1 SUS H1 SUS - Comment to Sat Amps Modified: L2 (PUM) Stages for ETMX, ETMY, ITMX, and ITMY https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87479 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87479</p><p>Here&#39;s the characterization data and fit results for <a href="https://dcc.ligo.org/LIGO-S1100127">S1100127</a>, assigned to ETMY L2&#39;s ULLLURLR OSEMs.</p> <p>This sat amp is a UK 4CH sat amp, <a href="https://dcc.ligo.org/LIGO-D0900900">D0900900</a> / <a href="https://dcc.ligo.org/LIGO-D0901284">D0901284</a>. The data was taken per methods described in <a href="https://dcc.ligo.org/LIGO-T080062-v3">T080062-v3</a>, using the diagrammatic setup shown on PAGE 1 of the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/86807_20250909120059_SatAmp_PDTransimpedance_FreqResp_MeasurementDiagrams.pdf">Measurement Diagrams</a> from <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86807">LHO:86807</a>.</p> <p>The data was processed and fit using <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/</a><br /> plotresponse_S1100127_ETMY_L2_ULLLURLR_20250916.m</p> <p>Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:</p> <table border="0"> <tbody> <tr> <th><tt>Optic&nbsp;</tt></th> <th><tt>Stage&nbsp;</tt></th> <th><tt>Serial_Number&nbsp;</tt></th> <th><tt>Channel_Number&nbsp;</tt></th> <th><tt>OSEM_Name&nbsp;</tt></th> <th><tt>Zero_Pole_Hz&nbsp;</tt></th> <th><tt>R_TIA_kOhm&nbsp;</tt></th> <th><tt>Foton_Design&nbsp;</tt></th> </tr> <tr> <td><tt>ETMY</tt></td> <td><tt>L2</tt></td> <td><tt>S1100127</tt></td> <td><tt>CH1</tt></td> <td><tt>UL</tt></td> <td><tt>0.0963:5.26</tt></td> <td><tt>121.25</tt></td> <td><tt>zpk([5.26],[0.0963],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH2</tt></td> <td><tt>LL</tt></td> <td><tt>0.0958:5.24</tt></td> <td><tt>121.25</tt></td> <td><tt>zpk([5.24],[0.0958],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH3</tt></td> <td><tt>UR</tt></td> <td><tt>0.0952:5.2</tt></td> <td><tt>121.25</tt></td> <td><tt>zpk([5.2],[0.0952],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH4</tt></td> <td><tt>LR</tt></td> <td><tt>0.0954:5.21</tt></td> <td><tt>121.25</tt></td> <td><tt>zpk([5.21],[0.0954],1,&quot;n&quot;)</tt></td> </tr> </tbody> </table> <p>The attached plot and machine readable .txt file version of the above table are also found in <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/</a><br /> 2025-09-16_UKSatAmp_S1100127_D0901284-v5_fitresults.txt</p> <p>Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from <a href="https://dcc.ligo.org/LIGO-G2501621">G2501621</a>, a la what was done for PR3 and SR3 top masses in <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86222">LHO:86222</a> and <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=84531">LHO:84531</a> respectively.</p> <!--- Output file_0_87479 div --> <div id="file_0_87479" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87479 div --> </div> <!--- Output files_0_87479 div --> <div id="files_0_87479" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87479_20251014172116_2025-09-16_UKSatAmp_S1100127_D0901284-v5.pdf" target="blank">2025-09-16_UKSatAmp_S1100127_D0901284-v5.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87479 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87479 oli.patane@ligo.org Tue, 14 Oct 2025 17:21:18 -0700 H1 SUS H1 SUS - Comment to Sat Amps Modified: L2 (PUM) Stages for ETMX, ETMY, ITMX, and ITMY https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87478 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87478</p><p>Here&#39;s the characterization data and fit results for <a href="https://dcc.ligo.org/LIGO-S1100119">S1100119</a>, assigned to ETMX L2&#39;s ULLLURLR OSEMs.</p> <p>This sat amp is a UK 4CH sat amp, <a href="https://dcc.ligo.org/LIGO-D0900900">D0900900</a> / <a href="https://dcc.ligo.org/LIGO-D0901284">D0901284</a>. The data was taken per methods described in <a href="https://dcc.ligo.org/LIGO-T080062-v3">T080062-v3</a>, using the diagrammatic setup shown on PAGE 1 of the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/86807_20250909120059_SatAmp_PDTransimpedance_FreqResp_MeasurementDiagrams.pdf">Measurement Diagrams</a> from <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86807">LHO:86807</a>.</p> <p>The data was processed and fit using <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/</a><br /> plotresponse_S1100119_ETMX_L2_ULLLURLR_20250916.m</p> <p>Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:</p> <table border="0"> <tbody> <tr> <th><tt>Optic&nbsp;</tt></th> <th><tt>Stage&nbsp;</tt></th> <th><tt>Serial_Number&nbsp;</tt></th> <th><tt>Channel_Number&nbsp;</tt></th> <th><tt>OSEM_Name&nbsp;</tt></th> <th><tt>Zero_Pole_Hz&nbsp;</tt></th> <th><tt>R_TIA_kOhm&nbsp;</tt></th> <th><tt>Foton_Design&nbsp;</tt></th> </tr> <tr> <td><tt>ETMX</tt></td> <td><tt>L2</tt></td> <td><tt>S1100119</tt></td> <td><tt>CH1</tt></td> <td><tt>UL</tt></td> <td><tt>0.0949:5.19</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.19],[0.0949],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH2</tt></td> <td><tt>LL</tt></td> <td><tt>0.0971:5.32</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.32],[0.0971],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH3</tt></td> <td><tt>UR</tt></td> <td><tt>0.0964:5.27</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.27],[0.0964],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH4</tt></td> <td><tt>LR</tt></td> <td><tt>0.0957:5.23</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.23],[0.0957],1,&quot;n&quot;)</tt></td> </tr> </tbody> </table> <p>The attached plot and machine readable .txt file version of the above table are also found in <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/</a><br /> 2025-09-16_UKSatAmp_S1100119_D0901284-v5_fitresults.txt</p> <p>Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from <a href="https://dcc.ligo.org/LIGO-G2501621">G2501621</a>, a la what was done for PR3 and SR3 top masses in <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86222">LHO:86222</a> and <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=84531">LHO:84531</a> respectively.</p> <!--- Output file_0_87478 div --> <div id="file_0_87478" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87478 div --> </div> <!--- Output files_0_87478 div --> <div id="files_0_87478" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87478_20251014171911_2025-09-16_UKSatAmp_S1100119_D0901284-v5.pdf" target="blank">2025-09-16_UKSatAmp_S1100119_D0901284-v5.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87478 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87478 oli.patane@ligo.org Tue, 14 Oct 2025 17:19:13 -0700 H1 SUS H1 SUS - Comment to Sat Amps Modified: L2 (PUM) Stages for ETMX, ETMY, ITMX, and ITMY https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87480 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87480</p><p>Here&#39;s the characterization data and fit results for <a href="https://dcc.ligo.org/LIGO-S1100118">S1100118</a>, assigned to ITMX L2&#39;s ULLLURLR OSEMs.</p> <p>This sat amp is a UK 4CH sat amp, <a href="https://dcc.ligo.org/LIGO-D0900900">D0900900</a> / <a href="https://dcc.ligo.org/LIGO-D0901284">D0901284</a>. The data was taken per methods described in <a href="https://dcc.ligo.org/LIGO-T080062-v3">T080062-v3</a>, using the diagrammatic setup shown on PAGE 1 of the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/86807_20250909120059_SatAmp_PDTransimpedance_FreqResp_MeasurementDiagrams.pdf">Measurement Diagrams</a> from <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86807">LHO:86807</a>.</p> <p>The data was processed and fit using <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/</a><br /> plotresponse_S1100118_ITMX_L2_ULLLURLR_20250916.m</p> <p>Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:</p> <table border="0"> <tbody> <tr> <th><tt>Optic&nbsp;</tt></th> <th><tt>Stage&nbsp;</tt></th> <th><tt>Serial_Number&nbsp;</tt></th> <th><tt>Channel_Number&nbsp;</tt></th> <th><tt>OSEM_Name&nbsp;</tt></th> <th><tt>Zero_Pole_Hz&nbsp;</tt></th> <th><tt>R_TIA_kOhm&nbsp;</tt></th> <th><tt>Foton_Design&nbsp;</tt></th> </tr> <tr> <td><tt>ITMX</tt></td> <td><tt>L2</tt></td> <td><tt>S1100118</tt></td> <td><tt>CH1</tt></td> <td><tt>UL</tt></td> <td><tt>0.0966:5.27</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.27],[0.0966],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH2</tt></td> <td><tt>LL</tt></td> <td><tt>0.0961:5.25</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.25],[0.0961],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH3</tt></td> <td><tt>UR</tt></td> <td><tt>0.0963:5.26</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.26],[0.0963],1,&quot;n&quot;)</tt></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td><tt>CH4</tt></td> <td><tt>LR</tt></td> <td><tt>0.097:5.3</tt></td> <td><tt>120</tt></td> <td><tt>zpk([5.3],[0.097],1,&quot;n&quot;)</tt></td> </tr> </tbody> </table> <p>The attached plot and machine readable .txt file version of the above table are also found in <a href="https://svn.ligo.caltech.edu/svn/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/">${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/</a><br /> 2025-10-14_UKSatAmp_S1100118_D0901284-v5_fitresults.txt</p> <p>Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from <a href="https://dcc.ligo.org/LIGO-G2501621">G2501621</a>, a la what was done for PR3 and SR3 top masses in <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86222">LHO:86222</a> and <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=84531">LHO:84531</a> respectively.</p> <!--- Output file_0_87480 div --> <div id="file_0_87480" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87480 div --> </div> <!--- Output files_0_87480 div --> <div id="files_0_87480" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87480_20251014171847_2025-10-14_UKSatAmp_S1100118_D0901284-v5.pdf" target="blank">2025-10-14_UKSatAmp_S1100118_D0901284-v5.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87480 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87480 oli.patane@ligo.org Tue, 14 Oct 2025 17:18:49 -0700 H1 SUS H1 ISC - Apparent camera offset change https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87473 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87473</p><p>Jenne, Elenna, Oli, Ryan S, Ryan C, Matt</p> <p>Today the engagement of the camera servos significantly reduced the buildups. The <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014163944_camera_servo_engagement.png">first attachment</a> shows how the PRG, REFL LF and circ power signals dropped as the camera servo guardian engaged the cameras. After reengaging the ADS, we saw that the buildups increased again, although not to the exact same level that they were before the camera engaged. This suggested to us that the camera servos were not going to the same camera set point as before. Oli spoke to the vacuum team that had been doing work at EY and found out that the EY camera cable had been very taut and they tried to loosen it. It&#39;s possible they bumped the camera during their work.</p> <p>While we were considering what to do, we noticed that OMC DCPD sum was increasing rapidly. We realized this was due to a PI ringing up at <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170958_OMC_PI_10p2.png">10.2 kHz</a>. It&#39;s not a PI we usually damp, so there were no PI guardian warnings, and we didn&#39;t know how to damp it. Matt thinks this is a PI that we usually see ring up early in the lock, but with a relatively small amplitude, as the Y arm mode passes by. It usually does not need damping. We started getting DCPD saturations warnings, and we were certain we were going to lose lock. We thought perhaps that if we were in a slightly different beam position, that could cause this PI to ring up more than usual. Matt also pointed out that the CO2s had stayed on much longer for commissioning today. I had also held the IFO at 25 W before and after moving spots to perform some ASC measurements. So this was definitely not a normal locking process. However, the PI started to turn around on its own (we think), and we held the lock.</p> <p>Jenne and I tried engaging the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170623_camera_spot_move.png">camera servos again</a>, and saw that indeed doing so does reduce the buildups. Our thinking is that if the EY camera got bumped, the digital offset we normally use has probably changed. We also noticed that the low frequency sensitivity was slightly worse than usual, suggesting that wherever the beam was, the A2L decoupling was bad. So, we decided to move the EY camera offsets to see if we could regain the buildups, following the assumption that something had changed at EY. We looked at the camera offset value that was present when the ADS lines were on. We changed the ETMY pitch and yaw offset values. This resulted in a 2 count change for ETMY pitch, from -230 to -228 and a 0.5 ct change in yaw from -349.5 to -349. Changing to these new offsets increased the buildups again. We also saw that the ADS had taken the ETMX camera error signal to a slightly different offset, so we tried changing the ETMX pitch value, but this had no change on the buildups so we reverted.</p> <p>Even though this whole process was designed to bring us back to the nominal ETMY spot position, it appeared that the low frequency sensitivity was still bad, I ran the A2L script. I watched TJ&#39;s <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170630_A2L_script_run.png">A2L script scope</a> and noticed that the A2L starting value for ETMY pitch was very far from zero, so the script never took the A2L value to the minimum. Jenne and I ended up guesstimating what a good A2L value was so that the starting point would be close enough to the minimum that the script steps would go there. This results in a significantly different A2L gain than before for ETMY pitch. I copied the tables below for each A2L script attempt. The nominal ETMY pitch value before was 5.62 and now it is 6.43. According to the a2l lookup script, this is a 3.8 mm change in spot position. The ETMX A2L gains also updated slightly, as you can see below. I did not make any changes to the gains where the diff between final and inital was 0.01 in magnitude.</p> <p>Now that we have been in NLN for 3.5 hours, the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170627_arm_power_kappa_c_compare.png">buildups still seem lower than usual</a>. Circulating powers usually read about 382 &quot;kW&quot;, but they are currently reading about 374 &quot;kW&quot;. Kappa C is also 0.975, and it is usually 0.98. I&#39;m not convinced that the beam is in the correct spot.</p> <p>Jenne suggested that we could try going back to the old A2L gains, and then adjusting the camera offset until the ADS lines are minimized, which I think is a good idea. However, I do want to point out that our range is currently reading 160 Mpc on sensmon clean.</p> <p>The new ETMY camera offsets and the updated A2L gains are saved in lscparams and loaded in ISC_LOCK. First try:</p> <table> <thead> <tr> <th>Optic</th> <th>DOF</th> <th style="text-align:right">Initial</th> <th style="text-align:right">Final</th> <th style="text-align:right">Diff</th> </tr> </thead> <tbody> <tr> <td>ETMX</td> <td>P</td> <td style="text-align:right">3.07</td> <td style="text-align:right">3.13</td> <td style="text-align:right">0.06</td> </tr> <tr> <td>ETMX</td> <td>Y</td> <td style="text-align:right">4.79</td> <td style="text-align:right">4.85</td> <td style="text-align:right">0.06</td> </tr> <tr> <td>ETMY</td> <td>P</td> <td style="text-align:right">5.54</td> <td style="text-align:right">5.54</td> <td style="text-align:right">0</td> </tr> <tr> <td>ETMY</td> <td>Y</td> <td style="text-align:right">1.42</td> <td style="text-align:right">1.37</td> <td style="text-align:right">-0.05</td> </tr> <tr> <td>ITMX</td> <td>P</td> <td style="text-align:right">-0.45</td> <td style="text-align:right">-0.46</td> <td style="text-align:right">-0.01</td> </tr> <tr> <td>ITMX</td> <td>Y</td> <td style="text-align:right">3.16</td> <td style="text-align:right">3.15</td> <td style="text-align:right">-0.01</td> </tr> <tr> <td>ITMY</td> <td>P</td> <td style="text-align:right">0.19</td> <td style="text-align:right">0.2</td> <td style="text-align:right">0.01</td> </tr> <tr> <td>ITMY</td> <td>Y</td> <td style="text-align:right">-2.75</td> <td style="text-align:right">-2.75</td> <td style="text-align:right">0</td> </tr> </tbody> </table> <p>Second try:</p> <table> <thead> <tr> <th>Optic</th> <th>DOF</th> <th style="text-align:right">Initial</th> <th style="text-align:right">Final</th> <th style="text-align:right">Diff</th> </tr> </thead> <tbody> <tr> <td>ETMX</td> <td>P</td> <td style="text-align:right">3.13</td> <td style="text-align:right">3.12</td> <td style="text-align:right">-0.01</td> </tr> <tr> <td>ETMX</td> <td>Y</td> <td style="text-align:right">4.85</td> <td style="text-align:right">4.85</td> <td style="text-align:right">0</td> </tr> <tr> <td>ETMY</td> <td>P</td> <td style="text-align:right">6.3</td> <td style="text-align:right">6.43</td> <td style="text-align:right">0.13</td> </tr> <tr> <td>ETMY</td> <td>Y</td> <td style="text-align:right">1.37</td> <td style="text-align:right">1.37</td> <td style="text-align:right">0</td> </tr> <tr> <td>ITMX</td> <td>P</td> <td style="text-align:right">-0.46</td> <td style="text-align:right">-0.46</td> <td style="text-align:right">0</td> </tr> <tr> <td>ITMX</td> <td>Y</td> <td style="text-align:right">3.15</td> <td style="text-align:right">3.16</td> <td style="text-align:right">0.01</td> </tr> <tr> <td>ITMY</td> <td>P</td> <td style="text-align:right">0.2</td> <td style="text-align:right">0.19</td> <td style="text-align:right">-0.01</td> </tr> <tr> <td>ITMY</td> <td>Y</td> <td style="text-align:right">-2.75</td> <td style="text-align:right">-2.75</td> <td style="text-align:right">0</td> </tr> </tbody> </table> <!--- Output file_1_87473 div --> <div id="file_1_87473" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87473 div --> </div> <!--- Output files_1_87473 div --> <div id="files_1_87473" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014163944_camera_servo_engagement.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87473_20251014163944_camera_servo_engagement.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170623_camera_spot_move.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87473_20251014170623_camera_spot_move.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170627_arm_power_kappa_c_compare.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87473_20251014170627_arm_power_kappa_c_compare.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170630_A2L_script_run.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87473_20251014170630_A2L_script_run.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87473_20251014170958_OMC_PI_10p2.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87473_20251014170958_OMC_PI_10p2.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87473 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87473 elenna.capote@ligo.org Tue, 14 Oct 2025 17:10:25 -0700 H1 ISC H1 General - OPS Tuesday Day shift summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87459 <p>Author: ryan.crouch@ligo.org</p><p>Report ID: 87459</p><p><strong>TITLE:</strong> 10/14 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 153Mpc<br /> <strong>INCOMING OPERATOR:</strong> Oli<br /> <strong>SHIFT SUMMARY: </strong>We ran into some issues after relocking following maintenance, but everything is stable currently. Is it in the best setup/orientation? Maybe not.<br /> <strong>LOG:</strong>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</p> <table> <tbody> <tr> <th>Start Time</th> <th>System</th> <th>Name</th> <th>Location</th> <th>Lazer_Haz</th> <th>Task</th> <th>Time End</th> </tr> <tr> <td>22:52</td> <td>SAF</td> <td>Laser HAZARD</td> <td>LVEA</td> <td>YES</td> <td>LVEA is Laser HAZARD \u0d26\u0d4d\u0d26\u0d3f(\u239a_\u239a)</td> <td>15:51</td> </tr> <tr> <td>14:34</td> <td>FAC</td> <td>Eric</td> <td>Mech room</td> <td>N</td> <td>FAC checks</td> <td>14:55</td> </tr> <tr> <td>14:35</td> <td>FAC</td> <td>Randy</td> <td>Yarm</td> <td>N</td> <td>Beam tube inspection, midy to corner</td> <td>18:39</td> </tr> <tr> <td>15:08</td> <td>SUS</td> <td>Jeff</td> <td>CR</td> <td>N</td> <td>ETMX measurements, prep for satamp swap</td> <td>16:08</td> </tr> <tr> <td>15:08</td> <td>SUS</td> <td>Matt</td> <td>CR</td> <td>N</td> <td>ITM measurements</td> <td>15:25</td> </tr> <tr> <td>15:12</td> <td>TCS</td> <td>Matt</td> <td>LVEA</td> <td>Y</td> <td>Turn off sidebands</td> <td>15:25</td> </tr> <tr> <td>15:18</td> <td>FAC</td> <td>Chris</td> <td>Out buildings</td> <td>N</td> <td>FAMIS checks</td> <td>16:59</td> </tr> <tr> <td>15:24</td> <td>FAC</td> <td>Kim</td> <td>EndX</td> <td>N</td> <td>Tech clean</td> <td>16:39</td> </tr> <tr> <td>15:24</td> <td>FAC</td> <td>Nellie</td> <td>EndX</td> <td>N</td> <td>Tech clean</td> <td>16:38</td> </tr> <tr> <td>15:25</td> <td>VAC</td> <td>Gerardo, Jordan</td> <td>EY</td> <td>N</td> <td>Purge air</td> <td>17:15</td> </tr> <tr> <td>15:28</td> <td>FAC</td> <td>Tyler</td> <td>Yarm</td> <td>N</td> <td>Termination slab checks</td> <td>19:04</td> </tr> <tr> <td>15:31</td> <td>EE</td> <td>Fil</td> <td>CER</td> <td>Y</td> <td>ITM work</td> <td>16:11</td> </tr> <tr> <td>15:35</td> <td>OPS</td> <td>RyanS</td> <td>LVEA</td> <td>Y -&gt; N</td> <td>HAZARD TRANSITION, to safe</td> <td>15:51</td> </tr> <tr> <td>16:04</td> <td>FAC</td> <td>Richard</td> <td>LVEA</td> <td>N</td> <td>Safety checks</td> <td>16:25</td> </tr> <tr> <td>16:05</td> <td>VAC</td> <td>Anna</td> <td>LVEA</td> <td>N</td> <td>Join RGA team</td> <td>17:15</td> </tr> <tr> <td>16:06</td> <td>VAC</td> <td>Travis</td> <td>MidX</td> <td>N</td> <td>Emergency pump checks</td> <td>17:11</td> </tr> <tr> <td>16:13</td> <td>SUS</td> <td>Jeff</td> <td>CR</td> <td>N</td> <td>ETMY measurement</td> <td>16:51</td> </tr> <tr> <td>16:14</td> <td>EE</td> <td>Fil</td> <td>Ends, X -&gt; Y</td> <td>N</td> <td>Satamp swap, EY at 16:38 UTC</td> <td>17:22</td> </tr> <tr> <td>16:32</td> <td>ISC</td> <td>Sam</td> <td>LVEA</td> <td>N</td> <td>Measure stuff</td> <td>17:13</td> </tr> <tr> <td>16:33</td> <td>&nbsp;</td> <td>Keita, Alicia, Joan-Rene</td> <td>LVEA</td> <td>N</td> <td>Tour, take pictures</td> <td>17:14</td> </tr> <tr> <td>16:42</td> <td>PSL</td> <td>Rahul, Jennie</td> <td>Optics lab</td> <td>LOCAL</td> <td>ISS PD array</td> <td>18:23</td> </tr> <tr> <td>16:43</td> <td>FAC</td> <td>Nellie, Kim</td> <td>LVEA</td> <td>N</td> <td>Tech clean</td> <td>18:21</td> </tr> <tr> <td>16:51</td> <td>SUS</td> <td>Jeff</td> <td>LVEA</td> <td>N</td> <td>ITMX SAT amp measurement</td> <td>17:03</td> </tr> <tr> <td>17:00</td> <td>FAC</td> <td>Chris</td> <td>LVEA</td> <td>N</td> <td>FAMIS checks</td> <td>17:25</td> </tr> <tr> <td>17:22</td> <td>EE</td> <td>Marc, Fil</td> <td>LVEA HAM5</td> <td>N</td> <td>SUS R7 rack work, chassis installations</td> <td>18:59</td> </tr> <tr> <td>17:04</td> <td>SUS</td> <td>Jeff</td> <td>LVEA</td> <td>N</td> <td>SR75 measurement in the Biergarten ITMX</td> <td>18:05</td> </tr> <tr> <td>17:11</td> <td>VAC</td> <td>Travis</td> <td>MidY</td> <td>N</td> <td>Emergency pump checks</td> <td>17:42</td> </tr> <tr> <td>17:31</td> <td>FAC</td> <td>Richard, Alicia, Joan-Rene</td> <td>OSB roof</td> <td>N</td> <td>Admire the view</td> <td>17:47</td> </tr> <tr> <td>17:33</td> <td>VAC</td> <td>Janos, Anna</td> <td>LVEA</td> <td>N</td> <td>Move parts</td> <td>18:01</td> </tr> <tr> <td>17:35</td> <td>VAC</td> <td>Jordan</td> <td>LVEA</td> <td>N</td> <td>1000 amu RGA</td> <td>18:01</td> </tr> <tr> <td>17:48</td> <td>IMC</td> <td>Matt</td> <td>CR</td> <td>N</td> <td>IMC injections</td> <td>17:54</td> </tr> <tr> <td>17:56</td> <td>IMC</td> <td>Matt</td> <td>LVEA</td> <td>N</td> <td>Sidebands back on</td> <td>17:58</td> </tr> <tr> <td>18:00</td> <td>TCS</td> <td>Matt</td> <td>LVEA</td> <td>N</td> <td>Turn back on TCS Y</td> <td>18:10</td> </tr> <tr> <td>18:27</td> <td>VAC</td> <td>Jordan, Anna</td> <td>LVEA</td> <td>N</td> <td>YARM manifold rga</td> <td>19:02</td> </tr> <tr> <td>19:00</td> <td>TCS</td> <td>Matt</td> <td>LVEA</td> <td>N</td> <td>Reset both CO2 lasers</td> <td>19:04</td> </tr> <tr> <td>19:03</td> <td>OPS</td> <td>RyanS</td> <td>LVEA</td> <td>N</td> <td>LVEA sweep</td> <td>19:14</td> </tr> <tr> <td>19:24</td> <td>ASC</td> <td>Elenna</td> <td>CR</td> <td>N</td> <td>Soft ASC loops measurement</td> <td>21:06</td> </tr> <tr> <td>19:49</td> <td>PSL</td> <td>Rahul, Keita</td> <td>Optics lab</td> <td>N</td> <td>ISS Array work, laser safe</td> <td>21:46</td> </tr> <tr> <td>19:50</td> <td>FAC</td> <td>Randy</td> <td>Yarm beamtube</td> <td>N</td> <td>Beamtube inspection</td> <td>21:46</td> </tr> <tr> <td>20:42</td> <td>EE</td> <td>Fil</td> <td>MidY</td> <td>N</td> <td>Grab electronics parts</td> <td>21:42</td> </tr> <tr> <td>21:56</td> <td>&nbsp;</td> <td>Matt</td> <td>Vac prep lab</td> <td>N</td> <td>Grab a part</td> <td>22:06</td> </tr> <tr> <td>21:56</td> <td>PSL</td> <td>Jennie</td> <td>Optics lab</td> <td>N</td> <td>Double check something</td> <td>22:11</td> </tr> </tbody> </table> <ul> <li>15:32 UTC SUS PR3 and SR3 model restarts</li> <li>15:47 UTC GRD reboot&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87463">alog87463</a></li> <li>16:00 UTC SAT amp swaps, QUADs L2 (ITMY, ITMX, ETMX, ETMY)&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87469">alog87469</a></li> <li>16:43 UTC Norco arrived at the gate, CP2</li> <li>18:00 UTC TCS CO2Y trips off IR alarm</li> <li>18:08 UTC Back to regular locking <ul> <li>18:19 UTC IA</li> </ul> </li> <li>18:54 UTC CO2 X &amp; Y OUTPUT OFF &quot;Power too low&quot; <ul> <li>2 seconds before there was a HAM7 cps glitch that tripped the ISI</li> </ul> </li> <li>19:18 UTC I followed the wiki and minimized the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87459_20251014123237_SGH_FIBR_REJ_20251014_123219.png">SHG_FIBER_REJECTED_DC</a> as we relocked</li> <li>20:24 UTC we finished up the ASC loop measurements</li> <li>20:46 UTC GRB-Short <a href="https://gracedb.ligo.org/events/E610126/view/">E610126</a></li> <li>20:50 UTC While we were investigating the buildups dropping once the camera servo turned on a PI started to ring up around ~10.2k</li> <li>22:08 UTC Observing</li> </ul> <!--- Output file_1_87459 div --> <div id="file_1_87459" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87459 div --> </div> <!--- Output files_1_87459 div --> <div id="files_1_87459" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87459_20251014123237_SGH_FIBR_REJ_20251014_123219.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87459_20251014123237_SGH_FIBR_REJ_20251014_123219.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87459 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87459 ryan.crouch@ligo.org Tue, 14 Oct 2025 16:29:17 -0700 H1 General H1 General - Ops EVE Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87476 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87476</p><p><strong>TITLE:</strong> 10/14 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 154Mpc<br /> <strong>OUTGOING OPERATOR:</strong> Ryan C<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 12mph Gusts, 7mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.03 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.18 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p>Observing at 155Mpc and have been locked for almost three hours. Everything looking good.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87476 oli.patane@ligo.org Tue, 14 Oct 2025 16:17:09 -0700 H1 General H1 CDS - Comment to CDS Maintenance Summary: Tuesday 14th October 2025 https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87475 <p>Author: david.barker@ligo.org</p><p>Report ID: 87475</p><p>Tue14Oct2025<br /> LOC TIME HOSTNAME &nbsp; &nbsp; MODEL/REBOOT<br /> 08:32:35 h1sush2a &nbsp; &nbsp; h1suspr3 &nbsp; &nbsp;&lt;&lt;&lt; model restarts<br /> 08:33:06 h1sush56 &nbsp; &nbsp; h1sussr3 &nbsp; &nbsp;</p> <p><br /> 08:34:52 h1daqdc0 &nbsp; &nbsp; [DAQ] &lt;&lt;&lt; 0-leg restart<br /> 08:35:05 h1daqfw0 &nbsp; &nbsp; [DAQ]<br /> 08:35:05 h1daqtw0 &nbsp; &nbsp; [DAQ]<br /> 08:35:06 h1daqnds0 &nbsp; &nbsp;[DAQ]<br /> 08:35:13 h1daqgds0 &nbsp; &nbsp;[DAQ]<br /> 08:36:17 h1daqgds0 &nbsp; &nbsp;[DAQ] &lt;&lt;&lt; GDS0 needed 2nd restart<br /> 08:41:11 h1daqdc1 &nbsp; &nbsp; [DAQ] &lt;&lt;&lt; 1-leg restart<br /> 08:41:20 h1daqfw1 &nbsp; &nbsp; [DAQ]<br /> 08:41:21 h1daqtw1 &nbsp; &nbsp; [DAQ]<br /> 08:41:24 h1daqnds1 &nbsp; &nbsp;[DAQ]<br /> 08:41:30 h1daqgds1 &nbsp; &nbsp;[DAQ]<br /> 08:52:28 h1daqfw1 &nbsp; &nbsp; [DAQ] &lt;&lt;&lt; FW1 spontaneously restarted itself<br /> &nbsp;</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87475 david.barker@ligo.org Tue, 14 Oct 2025 15:24:37 -0700 H1 CDS H1 CDS - CDS Maintenance Summary: Tuesday 14th October 2025 https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87474 <p>Author: david.barker@ligo.org</p><p>Report ID: 87474</p><p><strong>WP12827 SUS HLTS Estimator</strong></p> <p><em>Jeff, Oli, Brian L, Edgard, Dave, Ryan C:</em></p> <p>New h1suspr3 and h1sussr3 models were installed. Slow channels had been renamed and therefore a DAQ restart was required.</p> <p><strong>WP12835 h1guardian1 reboot</strong></p> <p><em>TJ:</em></p> <p>h1guardian1 was rebooted, all nodes now have the latest userapps files and changes will be tracked by GRD-CFC.</p> <p><strong>DAQ Restart</strong></p> <p><em>Dave, Jonathan:</em></p> <p>The DAQ was restarted for the model changes. GDS0 needed a second restart. FW1 spontaneously restarted itself soon after the 1-leg restart.</p> <p>&nbsp;</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87474 david.barker@ligo.org Tue, 14 Oct 2025 15:16:18 -0700 H1 CDS H1 IOO - ISS measurements - 10th -14th October https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87466 <p>Author: jennifer.wright@ligo.org</p><p>Report ID: 87466</p><p>Jennie W, Keita, Rahul</p> <p>&nbsp;</p> <p>On Friday, Keita and Rahul and I tried moving PDs 2 and 6 to align them better with the others. As can be seen from the scans we did of the DC voltage of the diodes as we moved the input alignemnt in horizontal translation and yaw from alog #<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87290">87290</a>, 2 and 6 have a range of alignment that is shifted relative to the other 6.</p> <p>We also&nbsp;checked this with a IR sensitive camera with a zoom lens.</p> <p>One person used the camera with a zoom lens to check the spot on the PDs as another person loosened the screws from behind the array and the third person held the barrel of the PD assembly to stop it moving or rotating in an undesired direction.</p> <p>There is not a lot of space as 2 and 6 are in a column and are very close to diodes 1 and 5 on the right.</p> <p>The horizontal scan we took after these moves showed we had made things worse, see <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87466_20251014123943_20251010_post_moving_PD2and6_hori_scan.png">this</a> image.</p> <p>Later that afternoon, Keita moved the PD 2 back and checked the alignment and it looks better.</p> <hr /> <p>The alignment as of yesterday (Monday)&nbsp;was 143mm in pitch (as read out by the allen key in the PZT mirror pitch actuator wheel)&nbsp;and 0.4145 inches in horizontal translation as read out by the translation stage the PZT mirror sits on.</p> <p>Keita measured the coupling (after finding an error in my code from the previous coupling measurement I plotted last Thursday (alog #<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87400">87400</a>)).</p> <p>The coupling in both vertical and horizontal is below 10, so this should be good enough for install if all else checks out.</p> <p>&nbsp;</p> <p>Yesterday afternoon, Rahul and I did the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87466_20251014135829_20251013_vertical_scan_4162thou.png">vertical scan</a> (slightly off from the horizontal reference position of 0.4145 inches that Keita had aligned to). The data in this graph was collected at a horizontal translation stage reading of 0.4162 inches.</p> <p>We had to redo the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87466_20251014135840_20251014_hori_scan_143mm.png">horizontal scan</a> today as I missed out some scan values yesterday. The data was collected with the pitch indicator at 143mm (the allen key on the pitch wheel actuator).</p> <p>&nbsp;</p> ISC, PSL <!--- Output file_1_87466 div --> <div id="file_1_87466" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87466 div --> </div> <!--- Output files_1_87466 div --> <div id="files_1_87466" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87466_20251014123943_20251010_post_moving_PD2and6_hori_scan.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87466_20251014123943_20251010_post_moving_PD2and6_hori_scan.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87466_20251014130257_Screenshot2025-10-13at124738.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87466_20251014130257_Screenshot2025-10-13at124738.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87466_20251014135829_20251013_vertical_scan_4162thou.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87466_20251014135829_20251013_vertical_scan_4162thou.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87466_20251014135840_20251014_hori_scan_143mm.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87466_20251014135840_20251014_hori_scan_143mm.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87466 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87466 jennifer.wright@ligo.org Tue, 14 Oct 2025 14:00:41 -0700 H1 IOO H1 SEI - Comment to SEI_ENV node testing with High ASC gain testing https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87470 <p>Author: ryan.crouch@ligo.org</p><p>Report ID: 87470</p><p>It looks like we lost it from a big DHARD_P oscillation and it corresponds to CHARD_P gain increasing back to nominal right as the P filters are reset? I also made plots of the filter bits from Oli&#39;s filter history right click tool.</p> <!--- Output file_1_87470 div --> <div id="file_1_87470" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87470 div --> </div> <!--- Output files_1_87470 div --> <div id="files_1_87470" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87470_20251014132208_asc_filtergain_changes_lockloss.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87470_20251014132208_asc_filtergain_changes_lockloss.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87470 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87470 ryan.crouch@ligo.org Tue, 14 Oct 2025 13:23:31 -0700 H1 SEI H1 SUS - Sat Amps Modified: L2 (PUM) Stages for ETMX, ETMY, ITMX, and ITMY https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87469 <p>Author: filiberto.clara@ligo.org</p><p>Report ID: 87469</p><p>WP <a href="https://services2.ligo-la.caltech.edu/LHO/workpermits/view.php?permit_id=12836" style="color:#0563c1; text-decoration:underline">12836</a><br /> ECR <a href="https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?.submit=Identifier&amp;docid=E2400330&amp;version=" style="color:#0563c1; text-decoration:underline">E2400330</a><br /> Modified List&nbsp;<a href="https://dcc.ligo.org/T2500232-x0" style="color:#0563c1; text-decoration:underline">T2500232</a></p> <p>The following SUS SAT Amps were upgraded per ECR E2400330.&nbsp;Modification improves the&nbsp;whitening stage to reduce ADC noise from 0.05 to 10 Hz.</p> <table cellspacing="0" style="border-collapse:collapse; height:171px; width:469px"> <tbody> <tr> <td style="height:8px; text-align:center; vertical-align:middle; width:80px">Suspension</td> <td style="height:8px; text-align:center; vertical-align:middle; width:20px">Old</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">New</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">OSEM</td> </tr> <tr> <td style="height:8px; text-align:center; vertical-align:middle; width:80px">ETMX L2 (PUM)</td> <td style="height:8px; text-align:center; vertical-align:middle; width:20px">S1100146</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">S1100119</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">ULLLURLR</td> </tr> <tr> <td style="height:8px; text-align:center; vertical-align:middle; width:80px">ETMY L2 (PUM)</td> <td style="height:8px; text-align:center; vertical-align:middle; width:20px">S1100137</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">S1100127</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">ULLLURLR</td> </tr> <tr> <td style="height:8px; text-align:center; vertical-align:middle; width:80px">ITMX L2 (PUM)</td> <td style="height:8px; text-align:center; vertical-align:middle; width:20px">S1100135</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">S1100118</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">ULLLURLR</td> </tr> <tr> <td style="height:8px; text-align:center; vertical-align:middle; width:80px">ITMY L2 (PUM)</td> <td style="height:8px; text-align:center; vertical-align:middle; width:20px">S1000277</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">S1100148</td> <td style="height:8px; text-align:center; vertical-align:middle; width:60px">ULLLURLR</td> </tr> </tbody> </table> <p><br /> F. Clara, J. Kissel, O. Patane</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87469 filiberto.clara@ligo.org Tue, 14 Oct 2025 13:11:40 -0700 H1 SUS H1 PEM - Comment to H1 & L1 Down Due to M7.6 EQ (+also some high-ish winds) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87468 <p>Author: ryan.crouch@ligo.org</p><p>Report ID: 87468</p><p>We lost lock ~3 seconds after CHARD_Y filters bits are <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87468_20251014130519_Screenshot_20251014_130458.png">changed</a>, there&#39;s also a big jump in ground motion at the same time, and it was gusting &gt;30mph at the corner station.</p> <!--- Output file_1_87468 div --> <div id="file_1_87468" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87468 div --> </div> <!--- Output files_1_87468 div --> <div id="files_1_87468" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87468_20251014130148_Screenshot_20251014_130137.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87468_20251014130148_Screenshot_20251014_130137.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87468_20251014130519_Screenshot_20251014_130458.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87468_20251014130519_Screenshot_20251014_130458.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87468 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87468 ryan.crouch@ligo.org Tue, 14 Oct 2025 13:05:29 -0700 H1 PEM H1 General - LVEA Swept Post-Maintenance https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87467 <p>Author: ryan.short@ligo.org</p><p>Report ID: 87467</p><p>After maintenance wrapped up this morning, I swept through the LVEA to prep for observing. I unplugged an unused extension cord near the PSL racks and the scissor lift in the vertex/west bay area. Everything else looked okay.</p> <p>Jeff also mentioned that he moved an SR785 from the PSL racks into the Biergarten for his work this morning, but it&#39;s unplugged (in case someone goes looking for it later).</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87467 ryan.short@ligo.org Tue, 14 Oct 2025 12:51:14 -0700 H1 General H1 CDS - Guardian Pending Source File System (GRD-CFC) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87465 <p>Author: david.barker@ligo.org</p><p>Report ID: 87465</p><p>I have created an&nbsp;EPICS IOC which reports any Guardian nodes which use source file(s) which have&nbsp;been modified in userapps but have&nbsp;not been loaded into the nodes. On the next restart of such nodes (e.g. guardian reboot) the new code will be automatically loaded, and so this system permits us to load new code in a scheduled and orderly way, for example by the code-author/node-manager during Tuesday maintenance.</p> <p>This is similar to the front-end filter-module configuration file change (CFC) system, so I&#39;ve called this GRD-CFC.</p> <p>The CDS Overview MEDM has a &quot;GRD&nbsp;CFC&quot; button at the bottom showing the GRD-CFC status as GREEN/YELLOW. Pressing this button opens the H1CDS_GUARDIAN_CFC.adl MEDM (attached).</p> <p>This MEDM has three main areas:</p> <ul> <li>Top is the system overview. the magenta box encompasses the&nbsp;CFC summary (it will be yellow if one of more nodes are in need of reloading), the STATUS shows the IOC status</li> <li>Middle is the main Guardian nodes table. The grey boxes will turn yellow if any node has one or more source files which need to be loaded</li> <li>Bottom is the IOC details&nbsp;section. the yellow box encompassing&nbsp;server start and runtime information. The red box encompasses&nbsp;the database files&#39; validity.</li> </ul> <p>If any nodes are reporting pending changes, you can get pending file details by running the shell command:</p> <p><tt>guardian_modified_not_loaded</tt></p> <p>The output from this command provides information on how to list the line differences between pending files and what is running.</p> <!--- Output file_1_87465 div --> <div id="file_1_87465" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87465 div --> </div> <!--- Output files_1_87465 div --> <div id="files_1_87465" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87465_20251014121850_new_grd_cfc.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87465_20251014121850_new_grd_cfc.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87465 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87465 david.barker@ligo.org Tue, 14 Oct 2025 12:22:04 -0700 H1 CDS LHO VE - Tue CP1 Fill https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87464 <p>Author: david.barker@ligo.org</p><p>Report ID: 87464</p><p><strong>Tue Oct 14 10:08:10 2025 INFO: Fill completed in 8min 7secs</strong></p> <p>&nbsp;</p> <!--- Output file_1_87464 div --> <div id="file_1_87464" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87464 div --> </div> <!--- Output files_1_87464 div --> <div id="files_1_87464" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87464_20251014101441_CP1-1284.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87464_20251014101441_CP1-1284.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87464 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87464 david.barker@ligo.org Tue, 14 Oct 2025 10:14:44 -0700 LHO VE H1 GRD - h1guardian1 machine rebooted https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87463 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87463</p><p>Rebooted h1guardian1 at 1547UTC so that we could start with fresh fresh and it would become easier to manage any file differences with help from some of Dave&#39;s new screens and scripts.</p> <p>All nodes started up on their own, and Ryan C helped me recover them all back to a maintenance state.</p> CDS https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87463 thomas.shaffer@ligo.org Tue, 14 Oct 2025 08:55:40 -0700 H1 GRD H1 SEI - SEI_ENV node testing with High ASC gain testing https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87462 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87462</p><p>I went to test the high gain ASC states I made for SEI_ENV this morning while we were still locked this morning. The good news is that there were no errors in the code and it did exactly what I asked of it. The bad news is that we lost lock while transitioning back to a low gain state. This wasn&#39;t a great test though because I had a brain fart and forgot to change the thresholds for the test. The high gains were turned on, then immediately turned back. So I&#39;m not entirely sure if the lock loss was from the transition back, or just the fact that we quickly flipped it back and forth.&nbsp;</p> <p>The major change between what SEI_ENV does and what the script the operators use right now is that the sleep timers between engaging/disengaging each loop are almost completly gone. At minimum for the next test it seems that we need some for the return back to low gain, or maybe increased tramps.</p> <p>On the bright side, it looks like the structure of the node and the code seems to work, just need to tune it a bit. For now I&#39;ve returned this node back to its normal operation, without the high asc states.</p> GRD, ISC <!--- Output file_1_87462 div --> <div id="file_1_87462" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87462 div --> </div> <!--- Output files_1_87462 div --> <div id="files_1_87462" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87462_20251014084707_sei_env_high_asc_test.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87462_20251014084707_sei_env_high_asc_test.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87462 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87462 thomas.shaffer@ligo.org Tue, 14 Oct 2025 08:47:19 -0700 H1 SEI H1 General - OMC scans -- 2025-10-14 https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87461 <p>Author: matthewrichard.todd@ligo.org</p><p>Report ID: 87461</p><p><em>M. Todd</em></p> <hr /> <p>Today I ran another OMC scan (following last week&#39;s instructions alog <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87316">87316</a>&nbsp;and <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87342">87342</a>) after the morning lockloss to see if could a better measurement of the hot state overlaps.</p> <p>I was still limited to about 12 minutes after the lockloss, so we expect some amount of difference in the full hot state.</p> <p>I&#39;ve <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87461_20251014084122_sc_omc_scan_20251014.png">plotted</a> the results on top of last week&#39;s scans, in yellow. Analysis of this will follow in a comment.</p> <!--- Output file_1_87461 div --> <div id="file_1_87461" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87461 div --> </div> <!--- Output files_1_87461 div --> <div id="files_1_87461" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87461_20251014084122_sc_omc_scan_20251014.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87461_20251014084122_sc_omc_scan_20251014.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87461 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87461 matthewrichard.todd@ligo.org Tue, 14 Oct 2025 08:42:42 -0700 H1 General H1 CDS - Workstations updated https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87460 <p>Author: erik.vonreis@ligo.org</p><p>Report ID: 87460</p><p>Workstations were updated and rebooted.&nbsp; This was an OS packages update.&nbsp; Conda packages were not updated.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87460 erik.vonreis@ligo.org Tue, 14 Oct 2025 08:35:14 -0700 H1 CDS LHO FMCS - LVEA Zone 3B temperature control https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87458 <p>Author: eric.otterman@ligo.org</p><p>Report ID: 87458</p>The second stage heating contactor had burned up, reducing heating capacity. This is why the zone had difficulty maintaining set point on 10/13. I replaced the ruined contactor and checked functionality. https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87458 eric.otterman@ligo.org Tue, 14 Oct 2025 08:07:38 -0700 LHO FMCS H1 General - Comment to Ops Tuesday day shift start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87457 <p>Author: ryan.crouch@ligo.org</p><p>Report ID: 87457</p><p>SQZ_OPO reports &quot;pump fiber rej power in ham7 high&quot; so I get to try adjusting that today.</p> SQZ https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87457 ryan.crouch@ligo.org Tue, 14 Oct 2025 07:59:04 -0700 H1 General H1 General - Comment to Ops Tuesday day shift start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87456 <p>Author: ryan.crouch@ligo.org</p><p>Report ID: 87456</p><p>There was a small typo in inj_params in fm_dict that I found and fixed and reloaded.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87456 ryan.crouch@ligo.org Tue, 14 Oct 2025 07:41:52 -0700 H1 General H1 General - Ops Tuesday day shift start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87455 <p>Author: ryan.crouch@ligo.org</p><p>Report ID: 87455</p><p><strong>TITLE:</strong> 10/14 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Lock Acquisition<br /> <strong>OUTGOING OPERATOR:</strong> TJ<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 15mph Gusts, 10mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.04 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.26 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <ul> <li>Secondary microseism looks to be rebounding after increasing into the night</li> <li>We&#39;ve been locked for ~19 hours <ul> <li>PEM_MAG_INJ node is in error (Key error &#39;freq_low&#39;)</li> <li>The operator WS was stuck at &quot;failed to unmount&quot; when I arrived</li> </ul> </li> <li>11:33 UTC Superevent <a href="https://gracedb.ligo.org/superevents/S251014cn/view/">S251014cn</a></li> </ul> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87455 ryan.crouch@ligo.org Tue, 14 Oct 2025 07:33:39 -0700 H1 General LHO General - OPS Eve Shift Summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87454 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87454</p><p><strong>TITLE:</strong> 10/14 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 151Mpc<br /> <strong>INCOMING OPERATOR:</strong> TJ<br /> <strong>SHIFT SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING</strong> (~10 hr lock)</p> <p>2:53 - SQZ Dropped</p> <p>4:10 - SQZ recovered, back to OBS</p> <p>Mostly quiet shift except for the SQZ dropping due to FC lockloss.</p> <p>The Squeezer FC lost lock due to FC2 alignment walking away from a lockable GR_LOCKED configuration. As per the wiki, I trended the last time we had a stable lock and reset values for FC1, FC2 and ZM3 (P/Y). Then, I tuned FC2 a bit more to maximize GR_TRANS output. This worked.</p> <p>Interestingly, I first tried an alignment from a few days ago but this didn&#39;t work. I did this because FC2 has been increasing quite a bit in the last few days (screenshots) - probably worth looking into. The values I set FC suspensions to (using opticalign sliders)</p> <p>FC2 P: 1558, FC2 Y: 109.6&nbsp;</p> <p>FC1 P: -899.6, FC1 Y: -74</p> <p>ZM3 P: -66.25 ZM3 Y: -463</p> <p>I hope this issue doesn&#39;t happen again during OWL shift though the trend below from a few days ago shows FC2 P going up for the last few days seemingly with SQZ compensating in its alignment. Anecdotally, it seems related to the temperature since there&#39;s a diurnal breathing day to day (lows at night, highs in the day). <strong>Tagging SQZ to look at FC2 and FC.</strong></p> <p><strong>LOG:</strong></p> <p>&nbsp;</p> SQZ <!--- Output file_1_87454 div --> <div id="file_1_87454" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87454 div --> </div> <!--- Output files_1_87454 div --> <div id="files_1_87454" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87454_20251013220342_SQZFCIssues.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87454_20251013220342_SQZFCIssues.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87454_20251013220346_SQZFCRefVals.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87454_20251013220346_SQZFCRefVals.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87454_20251013220352_SQZFCRefValsTryAgain.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87454_20251013220352_SQZFCRefValsTryAgain.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87454 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87454 ibrahim.abouelfettouh@ligo.org Mon, 13 Oct 2025 22:04:36 -0700 LHO General LHO General - Ops Day Shift End https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87436 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87436</p><p><strong>TITLE:</strong> 10/13 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 150Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ibrahim<br /> <strong>SHIFT SUMMARY:</strong> Locked for 4 hours. We had one lock loss during commissioning time today, though it does not seem to be caused by any commissioning activites. useism is on its way up, and the wind is gusting above 30mph at times.&nbsp;<br /> <strong>LOG:</strong></p> <ul> <li>1543 Commissioning start</li> <li>1740 GRB short E609775 <ul> <li>Since we were already commissioning we will not stand down</li> </ul> </li> <li>1747 Lock loss</li> <li>1817 GRB short E609786 <ul> <li>Relocking, no stand down</li> </ul> </li> <li>1917 Observing</li> </ul> <table> <tbody> <tr> <th>Start Time</th> <th>System</th> <th>Name</th> <th>Location</th> <th>Lazer_Haz</th> <th>Task</th> <th>Time End</th> </tr> <tr> <td>22:52</td> <td>SAF</td> <td>Laser HAZARD</td> <td>LVEA</td> <td>YES</td> <td>LVEA is Laser HAZARD</td> <td>13:52</td> </tr> <tr> <td>14:36</td> <td>FAC</td> <td>Randy</td> <td>Yarm</td> <td>n</td> <td>Y arm bte checks</td> <td>18:36</td> </tr> <tr> <td>14:46</td> <td>FAC</td> <td>Kim</td> <td>Opt Lab</td> <td>n</td> <td>Tech clean</td> <td>15:10</td> </tr> <tr> <td>14:59</td> <td>FAC</td> <td>Nelly</td> <td>MY</td> <td>n</td> <td>Tech clean</td> <td>15:50</td> </tr> <tr> <td>15:11</td> <td>FAC</td> <td>Kim</td> <td>MX</td> <td>n</td> <td>Tech clean</td> <td>16:05</td> </tr> <tr> <td>15:33</td> <td>ISC</td> <td>Matt</td> <td>Prep lab</td> <td>n</td> <td>Cheeta table prep</td> <td>15:46</td> </tr> <tr> <td>16:38</td> <td>FAC</td> <td>Kim</td> <td>Prep lab</td> <td>n</td> <td>Table clean</td> <td>17:09</td> </tr> <tr> <td>16:50</td> <td>ISC</td> <td>Keita</td> <td>Opt Lab</td> <td>YES</td> <td>ISS array work</td> <td>20:54</td> </tr> <tr> <td>17:01</td> <td>SYS</td> <td>Mitchell</td> <td>MY</td> <td>n</td> <td>Checking out equipment</td> <td>17:49</td> </tr> <tr> <td>17:56</td> <td>ISC</td> <td>Matt</td> <td>Prep lab</td> <td>n</td> <td>More measurements</td> <td>18:13</td> </tr> <tr> <td>18:03</td> <td>VAC</td> <td>Janos</td> <td>EY, EX</td> <td>n</td> <td>Parts locate</td> <td>18:33</td> </tr> <tr> <td>18:07</td> <td>FAC</td> <td>Tyler</td> <td>Xarm</td> <td>n</td> <td>Checkng on X1 bte</td> <td>18:37</td> </tr> <tr> <td>20:21</td> <td>VAC</td> <td>Travis</td> <td>Mids</td> <td>n</td> <td>Measurement and prep for tomorrow</td> <td>20:50</td> </tr> <tr> <td>20:54</td> <td>ISC</td> <td>Rahul, Jennie</td> <td>Opt Lab</td> <td>YES</td> <td>ISS array work</td> <td>23:08</td> </tr> </tbody> </table> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87436 thomas.shaffer@ligo.org Mon, 13 Oct 2025 16:25:21 -0700 LHO General H1 ISC - Optical gain before and after power outage https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87453 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87453</p><p>In&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86964">86964</a>&nbsp;I ran a side by side comparison of the powers at various ports before and after the power outage so we could determine what, if anything had changed. Although it generally seemed like we had regained or even increased the powers everywhere, kappa C has indicated that the optical gain reduced. Our current kappa C has been consistently near 0.98 since the outage.</p> <p>However, I calculated the full optical gain value today from the most recent calibration report (<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87431">20251012T200500Z</a>) and the current exported report on August 23 (<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86530">20250823T183838Z</a>). Each report lists H_c in ct/m. I also chose a time just before each report was measured to calculate the OMC-DCPD_SUM/LSC-DARM_IN1 transfer function that provides the mA/ct calibration value.</p> <table border="1" cellpadding="1" cellspacing="1" style="height:86px; width:652px"> <tbody> <tr> <td><strong>Date</strong></td> <td><strong>OMC-DCPD_SUM/LSC-DARM_IN1 [mA/ct]</strong></td> <td><strong>H_c [ct/m]</strong></td> <td><strong>Optical gain [mA/pm]</strong></td> </tr> <tr> <td>10/12</td> <td>2505448</td> <td>3.423e6</td> <td>8.576</td> </tr> <tr> <td>8/23</td> <td>2465012</td> <td>3.478e8</td> <td>8.573</td> </tr> </tbody> </table> <p>It seems like our optical gain between these two times has actually stayed the same to much less than a percent. I&#39;m not sure what to make of this with regards to the calibration, given that the calibration report suggests an overall magnitude change in the sensing function (that we are correcting in the TDCFs), but in actuality the magnitude of the sensing function has remained constant.</p> CAL, IOO https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87453 elenna.capote@ligo.org Mon, 13 Oct 2025 16:21:44 -0700 H1 ISC LHO General - OPS Eve Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87452 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87452</p><p><strong>TITLE:</strong> 10/13 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 150Mpc<br /> <strong>OUTGOING OPERATOR:</strong> TJ<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 19mph Gusts, 14mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.05 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.31 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING</strong> (4 hr lock)</p> <p>Wind is pickign up. Secondary microseism is picking up. Hoping to stay quiet and locked for the shift.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87452 ibrahim.abouelfettouh@ligo.org Mon, 13 Oct 2025 16:20:41 -0700 LHO General H1 SUS - SatAmp Swap Auto Alog https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87448 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87448</p><div>When we&#39;re doing the satamp swaps, we always need to write alog comments for each serial number that was updated. The alogs have repetitive text but have multiple values that need to be changed, and it&#39;s time-consuming and easy to miss changing something. I&#39;ve written a script that automatically grabs the info and copies it to your clipboard so you can paste it into an alog.</div> <div>The script that I made for auto-generating the satamp swap alog is here as r12693:</div> <div><tt><strong>/ligo/svncommon/SusSVN/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/satampalog.py</strong></tt></div> <div>You can run it by entering the serial number of the satamp and using one of the following flags: <tt>--uk4ch</tt>, <tt>--us4ch</tt>, or <tt>--us8ch</tt> for the satamp type.</div> <div>&nbsp;</div> <div><u>Example</u>:</div> <div><tt>$ python3 satampalog_4Jeff.py&nbsp;S1100147 --uk4ch</tt></div> <div><tt>Alog for S1100147 is copied to clipboard. CRTL+V into alog and &#39;Preview&#39; or &#39;Save to Draft&#39;&nbsp;to fix formatting.</tt></div> <div>&nbsp;</div> <div>Pasting&nbsp;into an alog&nbsp;initially, it&#39;ll look like <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87448_20251013155948_before.png">this</a></div> <div> <div>Click &#39;Save to Draft&#39; to fix the formatting. It&#39;ll then look like <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87448_20251013155951_after.png">this</a></div> </div> <!--- Output file_1_87448 div --> <div id="file_1_87448" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87448 div --> </div> <!--- Output files_1_87448 div --> <div id="files_1_87448" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87448_20251013155948_before.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87448_20251013155948_before.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87448_20251013155951_after.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87448_20251013155951_after.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87448 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87448 oli.patane@ligo.org Mon, 13 Oct 2025 16:01:20 -0700 H1 SUS H1 SUS - Comment to H1SUSITMY L2DAMP P and R Open Loop Gain TFs https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87447 <p>Author: jeffrey.kissel@ligo.org</p><p>Report ID: 87447</p>FYI, we also took ITMX data for these loops as well. /ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGR0/Data 2025-07-08_2240UTC_H1SUSITMX_R0_WhiteNoise_0p02to50Hz_L2DAMP_OLGTF_P.xml 2025-07-08_2240UTC_H1SUSITMX_R0_WhiteNoise_0p02to50Hz_L2DAMP_OLGTF_R.xml <!--- Output file_1_87447 div --> <div id="file_1_87447" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87447 div --> </div> <!--- Output files_1_87447 div --> <div id="files_1_87447" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87447_20251013143014_2025-07-08_H1SUSITMX_SAGR0_L2DAMP_OLGTF_P.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87447_20251013143014_2025-07-08_H1SUSITMX_SAGR0_L2DAMP_OLGTF_P.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87447_20251013143017_2025-07-08_H1SUSITMX_SAGR0_L2DAMP_OLGTF_R.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87447_20251013143017_2025-07-08_H1SUSITMX_SAGR0_L2DAMP_OLGTF_R.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87447 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87447 jeffrey.kissel@ligo.org Mon, 13 Oct 2025 14:30:20 -0700 H1 SUS H1 SUS - Comment to SR3 P Estimator Blend filter swapped (back) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87445 <p>Author: brian.lantz@ligo.org</p><p>Report ID: 87445</p><p>Oli - Thanks for doing this test, I&#39;m looking forward to learning what happens. I think the question here is &quot;how well does it work&quot; and &quot;what do we see&quot; rather than &quot;does it work&quot;. I&#39;m hoping this will reduce the RMS a bit, although the analysis is complicated by the cross-coupling w/ length.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87445 brian.lantz@ligo.org Mon, 13 Oct 2025 13:44:29 -0700 H1 SUS H1 SUS - SR3 P Estimator Blend filter swapped (back) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87444 <p>Author: oli.patane@ligo.org</p><p>Report ID: 87444</p><p>For the SR3 P estimator, we had initially developed and installed blend filters (in <tt>H1:SUS-SR3_M1_EST_P_FUSION_MEAS_BP</tt> and <tt>H1:SUS-SR3_M1_EST_P_FUSION_MODL_BP</tt> filter banks), named <tt>pit_v1</tt>, that blended between the OSEMs on-resonance, and the estimator everywhere else (<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86452">86452</a>). After a bit, Brian Lantz made a <tt>pit_v2</tt> that included OSEM damping at two extra frequencies because we were having issues with extra resonances at 0.65 and 0.75 Hz that weren&#39;t being damped (<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86510">86510</a>)(<a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87444_20251013132050_2025-10-13_125509.png">filter comparisons</a>).<br /> Eventually we realized the reason why those two peaks weren&#39;t being damped was because we had forgotten to include the model contribution to P from L, and we installed those needed filters(<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86567">86567</a>). However, we <em>didn&#39;t</em> swap the blend filters back to <tt>pit_v1</tt> at the time.<br /> So during relocking today (<strong>2025/10/13 19:05:00 UTC</strong>), I swapped us <em>back to<tt> pit_v1</tt></em>. We will run with this until at least tomorrow morning and then verify that we don&#39;t see a difference in the damping of those two peaks.</p> SEI <!--- Output file_1_87444 div --> <div id="file_1_87444" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87444 div --> </div> <!--- Output files_1_87444 div --> <div id="files_1_87444" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87444_20251013132050_2025-10-13_125509.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87444_20251013132050_2025-10-13_125509.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87444_20251013132214_2025-10-13_120451.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87444_20251013132214_2025-10-13_120451.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87444_20251013132219_2025-10-13_121541.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87444_20251013132219_2025-10-13_121541.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87444_20251013132256_2025-10-13_120517.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87444_20251013132256_2025-10-13_120517.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87444 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87444 oli.patane@ligo.org Mon, 13 Oct 2025 13:22:58 -0700 H1 SUS H1 General - Comment to Lock loss 1747 UTC https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87443 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87443</p><p>Back to observing at 1917 UTC. Ran initial alignment, but I didn&#39;t have to do anything.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87443 thomas.shaffer@ligo.org Mon, 13 Oct 2025 12:23:14 -0700 H1 General H1 ISC - Comment to Camera spot calibration https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87442 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87442</p><p>I reran the ITMX beam spot calibration following the same method described above, but this time I checked how the beam spot moved on both ITMX and ITMY when I changed the BS camera offset. Turns out, they give the same answer, so that&#39;s good.</p> <table border="1" cellpadding="1" cellspacing="1" style="height:221px; width:777px"> <tbody> <tr> <td>&nbsp;</td> <td><strong>Camera Offset</strong></td> <td><strong>A2L gain</strong></td> <td><strong>Conversion</strong></td> </tr> <tr> <td><strong>ITMX P (ITMY P)</strong></td> <td>start: -230 ct, end: -231 ct</td> <td>start: -0.45 (0.19), end: -0.55 (0.09)</td> <td> <p>(6.41 mm - 5.96 mm)/-1 ct</p> <p><strong>= -0.45 mm/ct</strong></p> </td> </tr> <tr> <td><strong>ITMX Y (ITMY Y)</strong></td> <td>start: -236 ct, end: -237 ct</td> <td>start: 3.18 (-2.75), end: 3.06 (-2.63)</td> <td> <p>(11.26 mm - 11.70 mm)/ -1ct</p> <p><strong>= 0.44 mm/ct (-0.44 mm/ct for ITMY)</strong></p> </td> </tr> </tbody> </table> <p>&nbsp;</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87442 elenna.capote@ligo.org Mon, 13 Oct 2025 11:57:21 -0700 H1 ISC H1 General - Lock loss 1747 UTC https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87441 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87441</p><p>Lock loss <a href="https://ldas-jobs.ligo-wa.caltech.edu/~lockloss?event=1444412849">1444412849</a></p> <p>While it was during commissioning, it seems like it wasn&#39;t any of the activities going on at the time. Looks very much like the most recent lock losses we have that very quickly go.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87441 thomas.shaffer@ligo.org Mon, 13 Oct 2025 11:08:50 -0700 H1 General H1 ISC - Changing OFI temperature test https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87439 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87439</p><p>Jennie W, Elenna</p> <p>Today we changed the OFI temperature and monitored the OFI PD A power. At each temperature change, we reran Sheila&#39;s OMC fringe wrapping injection to replicate the measurement Sheila and Naoki did in alog&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78942">78942</a>.</p> <p><strong>Results:</strong> we did not see a very significant change in the OFI PD A power when we changed the OFI temperature from 37.5 C to 25.5 C. We see a smaller scattering shelf at 25.5 C than we do at 37.5 C.</p> <p>I saved Sheila&#39;s template over into my own directory as<code>&nbsp;/ligo/home/elenna.capote/OFI/OMC_fringe_wrapping.xml</code></p> <p>She had old references in that template (different from the alog) that were taken in Sept 2024. Those references indicated that an OFI temperature of 37.5 C had the smallest scattering shelf. Today, Jennie and I saw very little difference between the scattering shelves generated at 37.5 C (nominal temperature), 34.5 C and 30.5 C. Only when we measured at 25.5 C did we see the scatter shelf reduce slightly (<a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87439_20251013103517_OFI_temperature_OMC_fringe_wrapping.png">plot</a>).</p> <p>In this plot, I added in Sheila&#39;s old references that show the exact opposite result a year ago. Specifically, the 25.5 C measurement from now is very close to the old 37.5 C measurement from a year ago.</p> <p>At first, I didn&#39;t think there was much of a change in the power on OFI PD A. However, looking at the second trend, it looks like maybe the power dropped by a small amount. I might have needed to slow down this test more than I realized (<a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87439_20251013104014_OFI_temperature_PD_A.png">plot</a>). I saved this ndscope template in&nbsp;<code>/ligo/home/elenna.capote/OFI/OFI_TEC.yaml</code></p> <p>&nbsp;</p> <!--- Output file_1_87439 div --> <div id="file_1_87439" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87439 div --> </div> <!--- Output files_1_87439 div --> <div id="files_1_87439" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87439_20251013103517_OFI_temperature_OMC_fringe_wrapping.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87439_20251013103517_OFI_temperature_OMC_fringe_wrapping.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87439_20251013103637_OFI_temperature_OMC_fringe_wrapping_old_refs.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87439_20251013103637_OFI_temperature_OMC_fringe_wrapping_old_refs.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87439_20251013104014_OFI_temperature_PD_A.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87439_20251013104014_OFI_temperature_PD_A.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87439 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87439 elenna.capote@ligo.org Mon, 13 Oct 2025 10:41:32 -0700 H1 ISC LHO VE - Mon CP1 Fill https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87440 <p>Author: david.barker@ligo.org</p><p>Report ID: 87440</p><p><strong>Mon Oct 13 10:07:35 2025 INFO: Fill completed in 7min 32secs</strong></p> <p>&nbsp;</p> <!--- Output file_1_87440 div --> <div id="file_1_87440" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87440 div --> </div> <!--- Output files_1_87440 div --> <div id="files_1_87440" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87440_20251013103401_CP1-1283.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87440_20251013103401_CP1-1283.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87440 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87440 david.barker@ligo.org Mon, 13 Oct 2025 10:34:04 -0700 LHO VE H1 PSL - PSL 10-Day Trends https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87438 <p>Author: ryan.short@ligo.org</p><p>Report ID: 87438</p><p>FAMIS&nbsp;<a href="https://ligo-wa.accruent.net/LB_Request_UpdateElevate.asp?InstallID=2&amp;RequestID=31107">31107</a></p> <p>The main changes that can be seen this week are a result of our amplifier pump diode current adjustments on Tuesday (<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87338">alog87338</a>). Otherwise, no major events this week.</p> <!--- Output file_1_87438 div --> <div id="file_1_87438" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87438 div --> </div> <!--- Output files_1_87438 div --> <div id="files_1_87438" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87438_20251013100219_WeeklyCooling_10132025.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87438_20251013100219_WeeklyCooling_10132025.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87438_20251013100222_WeeklyEnv_10132025.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87438_20251013100222_WeeklyEnv_10132025.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87438_20251013100224_WeeklyLaser_10132025.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87438_20251013100224_WeeklyLaser_10132025.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87438_20251013100226_WeeklyStabilization_10132025.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87438_20251013100226_WeeklyStabilization_10132025.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87438 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87438 ryan.short@ligo.org Mon, 13 Oct 2025 10:02:36 -0700 H1 PSL LHO General - Ops Day Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87435 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87435</p><p><strong>TITLE:</strong> 10/13 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 153Mpc<br /> <strong>OUTGOING OPERATOR:</strong> Ryan S<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 17mph Gusts, 12mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.04 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.22 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong> Locked for 21.5 hours. No alarms, two GRB shorts overnight.</p> <ul> <li>0804 GRB short E609675</li> <li>0825 GRB short E609680</li> </ul> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87435 thomas.shaffer@ligo.org Mon, 13 Oct 2025 07:38:18 -0700 LHO General LHO General - OPS Eve Shift Summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87434 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87434</p><p><strong>TITLE:</strong> 10/13 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 151Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ryan S<br /> <strong>SHIFT SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING</strong> (12 hr lock)</p> <p>We were locked for the entirety of shift.</p> <p>The range came back over the course of the shiftso did not have to leave OBSERVING to touch up the squeezer.</p> <p>Wind and ground motion look good</p> <p><strong>LOG:</strong></p> <p>&nbsp;</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87434 ibrahim.abouelfettouh@ligo.org Sun, 12 Oct 2025 22:00:14 -0700 LHO General LHO General - Ops Day Shift End https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87427 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87427</p><p><strong>TITLE:</strong> 10/12 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 147Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ibrahim<br /> <strong>SHIFT SUMMARY:</strong> One lock loss that only needed initial alignment but full auto. After we thermalized I ran a calibration sweep in coordination with LLO. The range for this most recent lock looks to be trending down slightly. The SQZ blrms see it, but Ibrahim will keep an eye on things.<br /> <strong>LOG:</strong></p> <ul> <li>1515 Lock loss</li> <li>1659 Observing</li> <li>1958 Out of observing for a calibration measurement</li> <li>2029 Observing</li> </ul> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87427 thomas.shaffer@ligo.org Sun, 12 Oct 2025 16:30:35 -0700 LHO General LHO General - OPS Eve Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87433 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87433</p><p><strong>TITLE:</strong> 10/12 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 147Mpc<br /> <strong>OUTGOING OPERATOR:</strong> TJ<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 27mph Gusts, 21mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.04 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.22 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING </strong>(6 hr lock).</p> <p>Range is slowly going down seemingly due to SQZ. Wind is also picking up. If range continues to degrade, will re-tune the squeezer.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87433 ibrahim.abouelfettouh@ligo.org Sun, 12 Oct 2025 16:02:24 -0700 LHO General H1 TCS - TCS Chiller Water Level Top-Off - Biweekly https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87432 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87432</p><p>FAMIS<a href="https://ligo-wa.accruent.net/LB_Request_UpdateElevate.asp?InstallID=2&amp;RequestID=27825">27825</a></p> <p>No water added, values all looked good and were recorded into the sheet T2200289 sheet.</p> <p>I somehow missed this and its a week late, next one should run next week.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87432 thomas.shaffer@ligo.org Sun, 12 Oct 2025 15:47:11 -0700 H1 TCS H1 CAL - Calibration Sweep 1958 UTC https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87431 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87431</p><p>Coordinated a calibration measurement with LLO since we couldn&#39;t get it done yesterday. Back into observing 2029UTC</p> <p>Simulines start:</p> <p>PDT: 2025-10-12 13:04:59.811759 PDT<br /> UTC: 2025-10-12 20:04:59.811759 UTC<br /> GPS: 1444334717.811759</p> <p>Simulines end:</p> <p>PDT: 2025-10-12 13:28:25.449920 PDT<br /> UTC: 2025-10-12 20:28:25.449920 UTC<br /> GPS: 1444336123.449920</p> <p>Files:</p> <p>2025-10-12 20:28:25,294 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_<br /> SS/DARMOLG_SS_20251012T200500Z.hdf5<br /> 2025-10-12 20:28:25,302 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DA<br /> RM_SS/PCALY2DARM_SS_20251012T200500Z.hdf5<br /> 2025-10-12 20:28:25,308 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_<br /> L1_SS/SUSETMX_L1_SS_20251012T200500Z.hdf5<br /> 2025-10-12 20:28:25,312 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_<br /> L2_SS/SUSETMX_L2_SS_20251012T200500Z.hdf5<br /> 2025-10-12 20:28:25,317 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_<br /> L3_SS/SUSETMX_L3_SS_20251012T200500Z.hdf5<br /> &nbsp;</p> <!--- Output file_1_87431 div --> <div id="file_1_87431" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87431 div --> </div> <!--- Output files_1_87431 div --> <div id="files_1_87431" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87431_20251012133404_cal_after.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87431_20251012133404_cal_after.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87431 div --> </div> <!-- Output break div. --> <div class="break"></div> <!--- Output file_0_87431 div --> <div id="file_0_87431" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87431 div --> </div> <!--- Output files_0_87431 div --> <div id="files_0_87431" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87431_20251012140424_H1_calibration_report_20251012T200500Z.pdf" target="blank">H1_calibration_report_20251012T200500Z.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87431 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87431 thomas.shaffer@ligo.org Sun, 12 Oct 2025 14:04:29 -0700 H1 CAL LHO VE - Sun CP1 Fill https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87430 <p>Author: david.barker@ligo.org</p><p>Report ID: 87430</p><p><strong>Sun Oct 12 10:08:26 2025 INFO: Fill completed in 8min 22secs</strong></p> <p>&nbsp;</p> <!--- Output file_1_87430 div --> <div id="file_1_87430" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87430 div --> </div> <!--- Output files_1_87430 div --> <div id="files_1_87430" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87430_20251012102514_CP1-1282.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87430_20251012102514_CP1-1282.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87430 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87430 david.barker@ligo.org Sun, 12 Oct 2025 10:25:16 -0700 LHO VE H1 General - Comment to Lock loss 1515 UTC https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87429 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87429</p><p>1659 Observing. Needed an initial alignment, but all auto.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87429 thomas.shaffer@ligo.org Sun, 12 Oct 2025 10:00:17 -0700 H1 General H1 SUS - SRM watchdog trip thresholds updated https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87428 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87428</p><p>We&#39;ve recently been having some issues with SRM tripping during initial alignment and during DRMI acquisition, <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87370">alog87370</a> for example. After consulting with Jeff K, I&#39;ve bumped up the trip thresholds as listed below. This was based off of the last few trips, so hopefully it has enough of a buffer now. Saved in the safe and observe sdfs.</p> <table border="1" cellpadding="1" cellspacing="1" style="width:500px"> <tbody> <tr> <td>&nbsp;</td> <td>Old</td> <td>New</td> </tr> <tr> <td>M1</td> <td>150</td> <td>250</td> </tr> <tr> <td>M2</td> <td>200</td> <td>350</td> </tr> <tr> <td>M3</td> <td>225</td> <td>400</td> </tr> </tbody> </table> <p>&nbsp;</p> <!--- Output file_1_87428 div --> <div id="file_1_87428" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87428 div --> </div> <!--- Output files_1_87428 div --> <div id="files_1_87428" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87428_20251012095724_srm_wd_trip_thresholds.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87428_20251012095724_srm_wd_trip_thresholds.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87428 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87428 thomas.shaffer@ligo.org Sun, 12 Oct 2025 09:57:26 -0700 H1 SUS H1 General - Lock loss 1515 UTC https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87426 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87426</p><p>Lock loss <a href="https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/?event=1444317365">1444317365</a></p> <p>No obvious cause, ended a 29.5hour lock.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87426 thomas.shaffer@ligo.org Sun, 12 Oct 2025 08:31:41 -0700 H1 General LHO General - Ops Day Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87425 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87425</p><p><strong>TITLE:</strong> 10/12 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 154Mpc<br /> <strong>OUTGOING OPERATOR:</strong> Ryan S<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 9mph Gusts, 5mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.02 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.28 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong> Locked for 28.7 hours, range is stable, no alarms, no alerts overnight.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87425 thomas.shaffer@ligo.org Sun, 12 Oct 2025 07:27:18 -0700 LHO General LHO General - OPS Eve Shift Summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87424 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87424</p><p><strong>TITLE:</strong> 10/12 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 153Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ryan S<br /> <strong>SHIFT SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING</strong> (19 hr lock!)</p> <p>Range is stable. Environment is stable. Locked for the whole shift.</p> <p><strong>LOG:</strong></p> <p>None</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87424 ibrahim.abouelfettouh@ligo.org Sat, 11 Oct 2025 22:00:14 -0700 LHO General LHO General - OPS Eve Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87423 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87423</p><p><strong>TITLE:</strong> 10/11 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 153Mpc<br /> <strong>OUTGOING OPERATOR:</strong> TJ<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 15mph Gusts, 8mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.02 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.20 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING</strong></p> <p>Calibration sweep was not run this morning due to LLO not being thermalized. TJ plans on running it tomorrow with LLO.&nbsp;</p> <p>Otherwise, LHO has been quietyl observing for ~14 hours!</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87423 ibrahim.abouelfettouh@ligo.org Sat, 11 Oct 2025 16:34:16 -0700 LHO General LHO General - Ops Day Shift End https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87422 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87422</p><p><strong>TITLE:</strong> 10/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 153Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ibrahim<br /> <strong>SHIFT SUMMARY:</strong> Locked for almost 14hours. Range has been stable. Public tours came through, but it&#39;s been a very quiet shift.<br /> <strong>LOG:</strong></p> <ul> <li>2212 GRB short E609151</li> </ul> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87422 thomas.shaffer@ligo.org Sat, 11 Oct 2025 16:31:25 -0700 LHO General LHO General - Ops Day Mid Shift Report https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87421 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87421</p><p>Locked and observing for 9.5 hours. H1 and L1 have moved the calibration sweep to tomorrow since we could not get a coordinated time in today.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87421 thomas.shaffer@ligo.org Sat, 11 Oct 2025 12:19:57 -0700 LHO General LHO VE - Sat CP1 Fill https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87420 <p>Author: david.barker@ligo.org</p><p>Report ID: 87420</p><p><strong>Sat Oct 11 10:08:39 2025 INFO: Fill completed in 8min 36secs</strong></p> <p>&nbsp;</p> <!--- Output file_1_87420 div --> <div id="file_1_87420" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87420 div --> </div> <!--- Output files_1_87420 div --> <div id="files_1_87420" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87420_20251011102135_CP1-1281.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87420_20251011102135_CP1-1281.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87420 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87420 david.barker@ligo.org Sat, 11 Oct 2025 10:21:38 -0700 LHO VE LHO General - Ops Day Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87419 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87419</p><p><strong>TITLE:</strong> 10/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 154Mpc<br /> <strong>OUTGOING OPERATOR:</strong> Ryan S<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 6mph Gusts, 2mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.03 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.18 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong> Locked for almost 5 hours, no alarms, calm environment. Af ew GRB alerts and one lock loss over the night.&nbsp;</p> <ul> <li>0342 GRB short E608872</li> <li>0709 GRB short E608943</li> <li>0709 GRB short E608942</li> <li>0801 Lock loss</li> <li>0944 Observing</li> </ul> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87419 thomas.shaffer@ligo.org Sat, 11 Oct 2025 07:34:28 -0700 LHO General LHO General - OPS Eve Shift Summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87418 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87418</p><p><strong>TITLE:</strong> 10/11 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 150Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ryan S<br /> <strong>SHIFT SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING</strong> as of 00:38 UTC</p> <p>After the initial alignment at the start of the shift, IFO locked fully automatically. The wind has also since calmed down.&nbsp;</p> <p><strong>LOG:</strong></p> <table> <tbody> <tr> <th>Start Time</th> <th>System</th> <th>Name</th> <th>Location</th> <th>Lazer_Haz</th> <th>Task</th> <th>Time End</th> </tr> <tr> <td>22:52</td> <td>SAF</td> <td>Laser HAZARD</td> <td>LVEA</td> <td>YES</td> <td>LVEA is Laser HAZARD \u0d26\u0d4d\u0d26\u0d3f(\u239a_\u239a)</td> <td>13:52</td> </tr> <tr> <td>15:05</td> <td>fac</td> <td>randy</td> <td>y-arm</td> <td>-</td> <td>Y2 BTE inspection</td> <td>22:53</td> </tr> <tr> <td>16:38</td> <td>cheta</td> <td>matt</td> <td>CHETA.JAC</td> <td>-</td> <td>parts checks</td> <td>17:02</td> </tr> <tr> <td>17:02</td> <td>psl</td> <td>keita.jenny</td> <td>opticslab</td> <td>YES</td> <td>ISS PD Array</td> <td>00:28</td> </tr> <tr> <td>17:47</td> <td>pem</td> <td>mitch</td> <td>sitewide</td> <td>-</td> <td>dustmon famis</td> <td>18:40</td> </tr> </tbody> </table> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87418 ibrahim.abouelfettouh@ligo.org Fri, 10 Oct 2025 22:00:06 -0700 LHO General LHO FMCS - Checking HVAC Fans - Weekly FAMIS 27427 https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87417 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87417</p><p>Closes <a href="https://ligo-wa.accruent.net/LB_Request_UpdateElevate.asp?InstallID=2&amp;RequestID=27427">FAMIS 27427</a>, Last checked in <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87284">alog 87284</a></p> <p>Corner Station looks good - nothing of note</p> <p>Outstations look good too except for EX, which had a peak on Tuesday. This isn&#39;t a problem and is corroborated by Eric&#39;s <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87343">alog 87343</a>, reporting a fan bearing replacement on this fan. Everything has looked quiet since.</p> <p>Screenshots attached.</p> <!--- Output file_1_87417 div --> <div id="file_1_87417" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87417 div --> </div> <!--- Output files_1_87417 div --> <div id="files_1_87417" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87417_20251010165544_CSFanVibrometers10102025.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87417_20251010165544_CSFanVibrometers10102025.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87417_20251010165548_OutBuildingFanVibrometers10102025.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87417_20251010165548_OutBuildingFanVibrometers10102025.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87417 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87417 ibrahim.abouelfettouh@ligo.org Fri, 10 Oct 2025 16:55:56 -0700 LHO FMCS LHO General - Fri Ops DAY Shift Summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87405 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87405</p><p><strong>TITLE:</strong> 10/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 151Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ibrahim<br /> <strong>SHIFT SUMMARY:</strong></p> <p>Started day with high winds peaking at under 40mph at 10amPDT but they never really died.&nbsp; And then in the early afternoon a huge M7.6 EQ beteween Argentina/Antartica took over most of the afternoon.&nbsp; Ended the shift starting an Initial Alignment for the hand off to Ibrahim (EQ is steadily dropping, but it&#39;s still windy).<br /> <strong>LOG:</strong></p> <ul> <li>1430-2100 Y-Arm BTE iinspection continues for Y2 (between EY &amp; MY) [randy]</li> <li>1527 Grabbing cardboard &amp; open/close Reciving Door (nellie, kim)</li> <li>1600-1615 optics lab cleaning (nellie)</li> <li>1614-1702 Parts checks in Cheta lab (matt)</li> <li><strong>1701 ISS PD Array (keita,jenny,rahul)</strong> <ul> <li><strong>1937 lunch break</strong></li> <li><strong>2124 Returning to lab</strong></li> </ul> </li> <li>1747-1840 Dust Mon FAMIS check on-site (mitch)</li> <li>2049 LOCKLOSS due to M7.6 (see alog <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87415">87415</a>)</li> <li>2302 Started an Initial Alignment, but Y-arm has been strugglign to complete....but finally got past Green Arms and on PRC ALIGN!</li> </ul> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87405 corey.gray@ligo.org Fri, 10 Oct 2025 16:32:03 -0700 LHO General H1 CAL - Checking in on the calibration- it&#39;s fine, actually https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87409 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87409</p><p>Ibrahim ran a calibration measurement last night, report attached to this alog (again, the weird bug happened where it pulled the wrong report reference so I had to regenerate). Just from the first page, we can see that the PCAL/GDS transfer function, as measured by both PCAL X and Y, show the uncertainty to be around 1% again. We can see that the modeled actuation strength matches up very well with the current model that has been running since 8/28, indicating that I corrected the drivealign gain properly (ignoring all the mistakes I made in the middle).</p> <p>The difference in the sensing function is mostly due to the loss of optical gain, this came with the power outage. There might be some small change in the spring, but it is very minimal, and that lines up with the fact that trying to adjust the SRCL offset yesterday only made things worse.</p> <p>Comparing the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87409_20251010155328_GDS_PCAL.png">GDS/PCAL broadband</a> with previous measurements, we can see that this broadband (in red, Oct 10) is almost exactly the same at the broadband taken on Aug 28 (gray reference) when we pushed this particular calibration. There are small differences at low frequency, perhaps due to some change in the spring behavior of the sensing function, and at high frequency, which I don&#39;t have a good immediate reason for.</p> <p>Given that correcting the TST actuation strength brought the calibration almost exactly back to the model, I spoke with Joe to understand then what the &quot;mysterious&quot; large deviation in the calibration was on Oct 4 (green trace). In the process, I also made a plot comparing the same measurement times, but instead looking at <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87409_20251010155332_CAL_DELTAL_PCAL.png">CAL DELTA L/PCAL</a>, so examining what our calibration would look like without TDCFs (I matched the colors with teh GDS/PCAL plot). We determined that by comparing the CAL DELTAL measurement to the GDS measurement, indeed the TDCFs are doing&nbsp;<em>something</em>&nbsp;correctly; without them on Oct 4, our uncertainty woyld be over 6%. However, they are clearly not doing a perfect job of correcting us back to model. Joe thinks that this is because the TCDF correction process may not completely account for the effect of the DARM OLG between each of the actuation TDCF measurement points. We trended what happened to kappa UIM and kappa PUM when I adjusted the L3 drivealign gain to bring kappa TST back to 1 and we see that kappa UIM dropped by 0.9% and kappa PUM by 0.4%. This is happening because the DARM OLG is changing as we adjust kappa TST, and kappa UIM and kappa PUM are seeing some frequency dependent change, but their calculation is assuming that the DARM OLG is not changing.</p> <p>In summary, the increase calibration uncertainty on Oct 4 is exactly due to the increase in kappa TST, even though the TDCFs were correcting GDS. We can can see by comparing the broadbands from Sept 27 (purple trace) and Oct 4 that at both times the TCDFs were doing an imperfect job of correcting GDS, and that scales with how large the deviation from 1 is; on Sept 27 kappa TST was about 1.02. Now that the actuation strength has been corrected, there is no need to update the calibration at this time.</p> <!--- Output file_1_87409 div --> <div id="file_1_87409" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87409 div --> </div> <!--- Output files_1_87409 div --> <div id="files_1_87409" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87409_20251010155328_GDS_PCAL.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87409_20251010155328_GDS_PCAL.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87409_20251010155332_CAL_DELTAL_PCAL.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87409_20251010155332_CAL_DELTAL_PCAL.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87409_20251010162037_TDCF_trends.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87409_20251010162037_TDCF_trends.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87409 div --> </div> <!-- Output break div. --> <div class="break"></div> <!--- Output file_0_87409 div --> <div id="file_0_87409" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87409 div --> </div> <!--- Output files_0_87409 div --> <div id="files_0_87409" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87409_20251010122416_H1_calibration_report_20251010T002302Z.pdf" target="blank">H1_calibration_report_20251010T002302Z.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87409 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87409 elenna.capote@ligo.org Fri, 10 Oct 2025 16:20:40 -0700 H1 CAL LHO General - OPS Eve Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87416 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87416</p><p><strong>TITLE:</strong> 10/10 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Earthquake<br /> <strong>OUTGOING OPERATOR:</strong> Corey<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: EARTHQUAKE<br /> &nbsp; &nbsp; Wind: 31mph Gusts, 22mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.92 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.16 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p><strong>IFO is in INITIAL_ALIGNMENT</strong></p> <p>Recovering from an M7.6 EQ in the Drake Passage ( gap between Argentina and Antarctica). Ground motion is looking good - wind is looking meh.</p> <p>Plan is to lock, observe and stay that way.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87416 ibrahim.abouelfettouh@ligo.org Fri, 10 Oct 2025 16:15:11 -0700 LHO General H1 PEM - H1 & L1 Down Due to M7.6 EQ (+also some high-ish winds) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87415 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87415</p><p>Another big EQ rolling through.&nbsp; This one is down near Antartica!&nbsp; Debated when to transition to &quot;ASC Hi Gn&quot;, since R-wave was going to be 45-60min.&nbsp; But S&amp;P waves triggered EQ Mode + saw a yellow Picket Fence---Clicked on ASC Hi Gn button, but during the transition H1 lost lock.&nbsp; This might have been too big for ASC Hi Gn regardless, but kinda wished I clicked it earlier.</p> <p>Winds were peaking just under 40mph around the lockloss as well.</p> <p>Will be hanging out here for a few hours.&nbsp;</p> <ul> <li><strong>2040 Notification of a <a href="https://earthquake.usgs.gov/earthquakes/eventpage/us6000rgf4/executive">M7.6</a> EQ down near Antartica at the Drake Passage</strong> <ul> <li>R-wave due to arrive in ~1hr and is in the yellow/red area on EQ Response plot (see attached)</li> </ul> </li> <li><u>2043 Start seeing Picket Fence</u> activity (no colors tho)</li> <li>2045 L1 goes down</li> <li>2045 Start seeing S&amp;P Wave spikes on 0.03-0.1Hz Band on nuc5</li> <li><u>2048 EQ Mode Activated and also get get yellow Picket Fence</u></li> <li><strong>2049 Turned on Hi Gain ASC</strong></li> <li><strong>2049 H1-LOCKLOSS</strong></li> <li>2050 Keeping ISC LOCK at READY while riding out EQ.</li> <li>2059 Red Picket Fences -AND- SEI_ENV to LARGE_EQ -AND- SEI_CONF goes to LARGE_EQ_NOBRSXY</li> <li>2101 V1 goes down</li> <li>2125 Saw some light <em>BLUE</em> Picket Fences!&nbsp; (which most likely corresponds with the R-Wave arrival)</li> <li>2135 R-Wave peak (Same or a little bigger than the big Philippines last night).&nbsp;</li> </ul> <p>Now we wait for R-wave which is probably due to arrive around 2135-ish utc.</p> PEM, SEI <!--- Output file_1_87415 div --> <div id="file_1_87415" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87415 div --> </div> <!--- Output files_1_87415 div --> <div id="files_1_87415" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87415_20251010135527_M78_antartica_2025-10-10_13-46-43.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87415_20251010135527_M78_antartica_2025-10-10_13-46-43.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87415 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87415 corey.gray@ligo.org Fri, 10 Oct 2025 14:10:20 -0700 H1 PEM H1 DetChar - Witness channels of the set of near-30Hz and near-100Hz combs at LHO https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87414 <p>Author: joan-rene.merou@ligo.org</p><p>Report ID: 87414</p>[Joan-Rene Merou, Alicia Calafat, Anamaria Effler, Sheila Dwyer, Robert Schofield, Jenne Driggers] We have looked at the near-30 Hz and near-100 Hz combs (<a href="https://git.ligo.org/detchar/detchar-requests/-/issues/340">Detchar issue 340</a>) in all of LHO Fscan channels (Full 148 channels list can be found in <a href="https://git.ligo.org/CW/instrumental/fscan-configuration/-/blob/main/configuration/production/O4_H1_Fscan_ch_info.yml?ref_type=heads">O4_H1_Fscan_ch_info.yml</a>) to find witnesses and also channels where the amplitude and coherence change at the same dates as DARM. The list of combs is the following one: <table border="1" cellspacing="0" cellpadding="6" style="border-collapse: collapse; text-align: right;"> <thead> <tr> <th>spacing (Hz)</th> <th>offset (Hz)</th> </tr> </thead> <tbody> <tr><td>29.9695138888</td><td>0</td></tr> <tr><td>99.99845486125</td><td>70.02888889</td></tr> <tr><td>99.99845679</td><td>0</td></tr> <tr><td>99.99846</td><td>29.9694</td></tr> <tr><td>99.9984722225</td><td>89.90847222</td></tr> <tr><td>99.99865</td><td>0</td></tr> <tr><td>99.99845</td><td>10.08992</td></tr> <tr><td>29.96952</td><td>520.17208</td></tr> <tr><td>29.9695211</td><td>589.9007589</td></tr> <tr><td>29.96951374</td><td>760.22840625</td></tr> </tbody> </table> As reported by Xuanye Fan in <a href="https://git.ligo.org/detchar/detchar-requests/-/issues/296">Detchar issue 296</a>, "it can be determined that the high-order harmonics disappeared on April 8, 2024, and reappeared on July 7, 2024". Hence, we have compared coherence with DARM in all the channels and the difference between July 1st and July 7th 2024. Following the findings by Xuanye, we have redone the comb time-evolution plots for all of these combs in order to check for dates where their amplitude changed. As can be seen in the plots below, there are two clear dates where changes in the behavior of the combs took place, April ~4th 2024 and July ~7th 2024. The attached plots to this post are similar to the ones generated by Fscan using FscanFineToothPlot plots, however, they have two differences: They use data from the non-normalized spectras instead of from the time average plots. Additionally, they compute the relative harmonic amplitude with respect to the median of the surrounding 1 Hz spectrogram. The attached plots confirm that there is a significant change in comb amplitude between April 4th and July 7th 2024. One clear example is shown here: <img src="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134208_comb_999985_offset_299694_scatter_speclong.png" alt="Comb 99.9985 Hz Offset 29.9694 Hz amplitude evolution in O4 in DARM" width="1200"> We list here the channels that do show most of these Combs. These same channels do show changes in coherence between July 1st and July 7th 2024, but do not show changes in the amplitude of the combs. - H1_IMC-F_OUT_DQ - H1_LSC-MCL_IN1_DQ - H1_LSC-MICH_IN1_DQ - H1_LSC-SRCL_IN1_DQ - H1_PEM-CS_MAG_EBAY_LSCRACK_X_DQ - H1_PEM-CS_MAG_EBAY_LSCRACK_Y_DQ - H1_PEM-CS_MAG_EBAY_LSCRACK_Z_DQ - H1_PEM-CS_MAG_LVEA_INPUTOPTICS_X_DQ - H1_PEM-CS_MAG_LVEA_INPUTOPTICS_Y_DQ - H1_PEM-CS_MAG_LVEA_INPUTOPTICS_Z_DQ In most channels, the comb amplitude tends to get quite low after ~1500 Hz. The following sets of channels show differences between X, Y and Z: - H1_PEM-CS_MAG_EBAY_SUSRACK_X_DQ (Higher amplitudes and towards higher frequencies) - H1_PEM-CS_MAG_EBAY_SUSRACK_Y_DQ (Lower comb amplitudes) - H1_PEM-CS_MAG_EBAY_SUSRACK_Y_DQ (Lower comb amplitudes) Regarding CS_MAG_LVEA_OUTPUTOPTICS, these combs can be seen best in X, weaker in Y and almost non-existent in Z. (In CS_MAG_LVEA_INPUTOPTICS they look roughly the same height) - H1_PEM-CS_MAG_LVEA_OUTPUTOPTICS_X_DQ (Strongest) - H1_PEM-CS_MAG_LVEA_OUTPUTOPTICS_Y_DQ (Weaker lines) - H1_PEM-CS_MAG_LVEA_OUTPUTOPTICS_Z_DQ (Almost no lines) Same behavior at: - H1_PEM-CS_MAG_LVEA_VERTEX_X_DQ (Strongest lines) - H1_PEM-CS_MAG_LVEA_VERTEX_Y_DQ (Weaker lines) - H1_PEM-CS_MAG_LVEA_VERTEX_Z_DQ (Almost no lines) We can see that these combs mostly appear in the corner station. The combs do not appear in neither EX nor EY channels. However, comb 99.99865 Hz offset 0.000 appears in many EX, EY channels and does become more coherent after July 7th. However, it is very close to 100 Hz so it may be influenced by other round-number combs (?) DetChar <!--- Output file_1_87414 div --> <div id="file_1_87414" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87414 div --> </div> <!--- Output files_1_87414 div --> <div id="files_1_87414" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134113_comb_299695_offset_00000_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134113_comb_299695_offset_00000_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134117_comb_299695_offset_5201721_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134117_comb_299695_offset_5201721_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134121_comb_299695_offset_5899008_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134121_comb_299695_offset_5899008_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134124_comb_299695_offset_7602284_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134124_comb_299695_offset_7602284_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134128_comb_999985_offset_00000_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134128_comb_999985_offset_00000_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134204_comb_999985_offset_100899_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134204_comb_999985_offset_100899_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134208_comb_999985_offset_299694_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134208_comb_999985_offset_299694_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134212_comb_999985_offset_700289_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134212_comb_999985_offset_700289_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134215_comb_999985_offset_899085_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134215_comb_999985_offset_899085_scatter_speclong.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87414_20251010134219_comb_999986_offset_00000_scatter_speclong.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87414_20251010134219_comb_999986_offset_00000_scatter_speclong.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87414 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87414 joan-rene.merou@ligo.org Fri, 10 Oct 2025 13:51:57 -0700 H1 DetChar LHO VE - Fri CP1 Fill https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87408 <p>Author: david.barker@ligo.org</p><p>Report ID: 87408</p><p><strong>Fri Oct 10 10:07:47 2025 INFO: Fill completed in 7min 43secs</strong></p> <p>Gerardo confirmed a good fill curbside.</p> <!--- Output file_1_87408 div --> <div id="file_1_87408" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87408 div --> </div> <!--- Output files_1_87408 div --> <div id="files_1_87408" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87408_20251010102321_CP1-1280.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87408_20251010102321_CP1-1280.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87408 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87408 david.barker@ligo.org Fri, 10 Oct 2025 10:23:24 -0700 LHO VE H1 CAL - Comment to Some attempts to fix the calibration https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87407 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87407</p><p>I also did revert the gain change in the pydarm_ini file, but forgot to mention it earlier.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87407 elenna.capote@ligo.org Fri, 10 Oct 2025 09:31:19 -0700 H1 CAL H1 PSL - PSL Status Report (FAMIS #27398) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87406 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87406</p><p>This is for FAMIS #<a href="https://ligo-wa.accruent.net/LB_Request_UpdateElevate.asp?InstallID=2&amp;RequestID=27398">27398</a>.<br /> <strong>Laser Status</strong>:<br /> &nbsp; &nbsp; NPRO output power is <strong>1.857</strong>W<br /> &nbsp; &nbsp; AMP1 output power is <strong>70.67</strong>W<br /> &nbsp; &nbsp; AMP2 output power is <strong>140.3</strong>W<br /> &nbsp; &nbsp; NPRO watchdog is <strong>GREEN</strong><br /> &nbsp; &nbsp; AMP1 watchdog is <strong>GREEN</strong><br /> &nbsp; &nbsp; AMP2 watchdog is <strong>GREEN</strong><br /> &nbsp; &nbsp; PDWD watchdog is <strong>GREEN</strong></p> <p><strong>PMC</strong>:<br /> &nbsp; &nbsp; It has been locked <strong>16</strong> days, <strong>21</strong> hr <strong>4</strong> minutes<br /> &nbsp; &nbsp; Reflected power = <strong>24.26</strong>W<br /> &nbsp; &nbsp; Transmitted power = <strong>106.6</strong>W<br /> &nbsp; &nbsp; PowerSum = <strong>130.8</strong>W</p> <p><strong>FSS</strong>:<br /> &nbsp; &nbsp; It has been locked for <strong>0</strong> days <strong>1</strong> hr and <strong>35</strong> min<br /> &nbsp; &nbsp; TPD[V] = <strong>0.538</strong>V</p> <p><strong>ISS</strong>:<br /> &nbsp; &nbsp; The diffracted power is around <strong>3.9</strong>%<br /> &nbsp; &nbsp; Last saturation event was <strong>0</strong> days <strong>3</strong> hours and <strong>40</strong> minutes ago</p> <p><br /> <strong>Possible Issues:</strong><br /> &nbsp; &nbsp; PMC reflected power is high</p> PSL https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87406 corey.gray@ligo.org Fri, 10 Oct 2025 08:17:33 -0700 H1 PSL LHO General - Fri Ops Day Transition https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87404 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87404</p><p><strong>TITLE:</strong> 10/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 152Mpc<br /> <strong>OUTGOING OPERATOR:</strong> Ryan S<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 22mph Gusts, 13mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.04 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.14 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p>Looked like the spooky shaky night continued with another Phillipines EQ of M6.7 3hrs ago.&nbsp; But continuing from Ibrahim&#39;s summary, after his alignment, H1 automatically made it back to NLN to observe for under 2hrs until the next <a href="https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi/event/1444116506">lockloss</a>&nbsp;(no EQ tag tho); then a brief SQZ drop (see below).&nbsp; Finally the EQ 3+hr ago which took down H1/L1.&nbsp; There were no Wake-Up calls last night.</p> <p><u>Environmentally</u>:&nbsp; watch for EQs!&nbsp; AND winds have been picking up over the last 90min with winds just under 30mph currently.</p> <p><u><strong>Overnight ISSUES</strong></u>:</p> <ul> <li>1104-1108 SQZ Unlocked due to &quot;LO Railing&quot;:</li> </ul> <p><em>2025-10-10_09:47:27.819286Z SQZ_MANAGER executing state: FREQ_DEP_SQZ (100)<br /> 2025-10-10_11:04:43.645262Z SQZ_MANAGER [FREQ_DEP_SQZ.run] Unstalling SQZ_PMC<br /> 2025-10-10_11:04:43.839754Z SQZ_MANAGER [FREQ_DEP_SQZ.run] USERMSG 0: LO railing!<br /> 2025-10-10_11:04:43.839754Z SQZ_MANAGER [FREQ_DEP_SQZ.run] LO unlocked</em></p> SQZ <!--- Output file_1_87404 div --> <div id="file_1_87404" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87404 div --> </div> <!--- Output files_1_87404 div --> <div id="files_1_87404" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87404_20251010080013_nuc31-2.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87404_20251010080013_nuc31-2.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87404 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87404 corey.gray@ligo.org Fri, 10 Oct 2025 08:00:38 -0700 LHO General LHO General - OPS Eve Shift Summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87403 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87403</p><p><strong>TITLE:</strong> 10/10 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Earthquake<br /> <strong>INCOMING OPERATOR:</strong> Ryan S<br /> <strong>SHIFT SUMMARY:</strong></p> <p><strong>IFO is LOCKING at CHECK_IR</strong></p> <p>Started as a quiet shift in which there was a coordinated calibration sweep with LLO. It ran successfully - <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87401">alog 87401</a>.</p> <p>Then we lost lock due to a 7.4 EQ from the Philippines (lockloss <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87402">alog 87402</a>) After 2.5 hours of sitting in IDLE watching peakmon, I began to relock and though we made it past FIND_IR (losing lock a few times due to ground motion), we had very bad flashes at DRMI.</p> <p>I just finished running an initial alignment and now IFO is LOCKING.</p> <p><strong>LOG:</strong></p> <p>None</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87403 ibrahim.abouelfettouh@ligo.org Thu, 09 Oct 2025 22:00:06 -0700 LHO General H1 SEI - Lockloss 01:58 UTC https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87402 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87402</p><p>Earthquake caused lockloss from an M7.4 in the Philippines. High gain was active but was (understandably) not enough. Staying in DOWN until the ground calms down (still anticipating R waves in 33 mins according to SEI_CONFIG.</p> Lockloss https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87402 ibrahim.abouelfettouh@ligo.org Thu, 09 Oct 2025 19:04:58 -0700 H1 SEI H1 CAL - Calibration Sweep 10/09 https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87401 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87401</p><p>Per today&#39;s comissioning recommendation, I ran a calibration sweep at the same time as LLO (17:15 PT). It was successful.</p> <p><strong>BB Start: </strong>1444090610</p> <p><strong>BB End: </strong>1444090920</p> <p><strong>Simulines Start: </strong>1444091000</p> <p><strong>Simulines End: </strong>1444092397</p> <p>2025-10-10 00:45:43,280 | INFO | Finished gathering data. Data ends at 1444092360.0<br /> 2025-10-10 00:45:43,486 | INFO | It is SAFE TO RETURN TO OBSERVING now, whilst data is processed.<br /> 2025-10-10 00:45:43,486 | INFO | Commencing data processing.<br /> 2025-10-10 00:45:43,486 | INFO | Ending lockloss monitor. This is either due to having completed the measurement, and this functionality being terminated; or because the whole process was aborted.<br /> 2025-10-10 00:46:19,595 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20251010T002302Z.hdf5<br /> 2025-10-10 00:46:19,602 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20251010T002302Z.hdf5<br /> 2025-10-10 00:46:19,607 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20251010T002302Z.hdf5<br /> 2025-10-10 00:46:19,612 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20251010T002302Z.hdf5<br /> 2025-10-10 00:46:19,616 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20251010T002302Z.hdf5<br /> PDT: 2025-10-09 17:46:19.750557 PDT<br /> UTC: 2025-10-10 00:46:19.750557 UTC<br /> GPS: 1444092397.750557<br /> &nbsp;</p> <p><strong>Report:</strong>&nbsp;/ligo/groups/cal/H1/reports/20251010T002302Z/H1_calibration_report_20251010T002302Z.pdf</p> <p>&nbsp;</p> <!--- Output file_1_87401 div --> <div id="file_1_87401" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87401 div --> </div> <!--- Output files_1_87401 div --> <div id="files_1_87401" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87401_20251009184852_CALIBMONITOR10082025.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87401_20251009184852_CALIBMONITOR10082025.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87401 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87401 ibrahim.abouelfettouh@ligo.org Thu, 09 Oct 2025 19:01:29 -0700 H1 CAL H1 IOO - Measurements from 8th October https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87400 <p>Author: jennifer.wright@ligo.org</p><p>Report ID: 87400</p><p>Keita, Jennie W, Rahul</p> <p>&nbsp;</p> <p>Executive Summary: The coupling for PDs &amp; and 8 is between 200 and 300 RIN per m. This is far too high. We might need to re-align to a different spot tomorrow and retake coupling measurements.</p> <p>We went back into the lab yesterday afternoon (8th October) to find a spot where the PDs were all aligned well in DC voltage.</p> <p>We found a spot (by changing PZT mirror translation horizontally across the input beam and by tilting the input mirror. The first we use to optimise the horizontal coupling to the PDs, the second we use to optimise the vertical coupling.</p> <p>The spot we arrived at for the input pointing is one which doesn&#39;t seem to have particularly bad coupling in vertical or yaw for any of the PDs. This is made more problematic as PDs 2 and 6 are mis-aligned relative to the others in pitch and yaw (see graphs of PD DC alignment in LHO alog #<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87324">87324</a>) we think so there coupling is not minimised close to where the coupling of the other 5 diodes is minimised.</p> <p>Then we&nbsp;moved the QPD to be centred on this&nbsp;new spot.</p> <p>We took coupling measurements but will do the calibration tomorrow.</p> <p>The alignment references for this position are pitch allen key = 14.7mm</p> <p>Micrometer reading on translation stage = 0.4162 inches.</p> <p>Today I calibrated the data using the calibration from Tuesday. Since we moved the QPD after that point we need to scale the calibration value.</p> <p>Attached is Keita&#39;s working for this <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170011_rn_image_picker_lib_temp_e34de368-deab-4c78-8f67-8c513699a5b0.jpg">here</a> and <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170004_PXL_20251009_221045942.jpg">here</a>.</p> <p>The processed data is shown <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170201_20251009_Data_vert_hori_opt.png">here</a> and the DC values for each PD are <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170205_20251009_DC_measurment_h_v_opt.png">here</a>.</p> <p>One can see that 7 and 8 have a very high coupling, but their DC values are ok. PDs 2 and 4 have low&nbsp;coupling but their DC values are not too low as was the case with one of the PDs on Tuesday (LHO alog #<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87373">87373</a>), so I trust these values.</p> ISC, PSL <!--- Output file_1_87400 div --> <div id="file_1_87400" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87400 div --> </div> <!--- Output files_1_87400 div --> <div id="files_1_87400" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170004_PXL_20251009_221045942.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87400_20251009170004_PXL_20251009_221045942.jpg" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170011_rn_image_picker_lib_temp_e34de368-deab-4c78-8f67-8c513699a5b0.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87400_20251009170011_rn_image_picker_lib_temp_e34de368-deab-4c78-8f67-8c513699a5b0.jpg" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170201_20251009_Data_vert_hori_opt.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87400_20251009170201_20251009_Data_vert_hori_opt.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87400_20251009170205_20251009_DC_measurment_h_v_opt.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87400_20251009170205_20251009_DC_measurment_h_v_opt.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87400 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87400 jennifer.wright@ligo.org Thu, 09 Oct 2025 17:03:47 -0700 H1 IOO H1 CAL - Comment to Some attempts to fix the calibration https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87399 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87399</p><p>Request: veto time segment listed above.</p> DetChar-Request https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87399 elenna.capote@ligo.org Thu, 09 Oct 2025 16:40:50 -0700 H1 CAL LHO General - Thurs DAY Ops Summary https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87383 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87383</p><p><strong>TITLE:</strong> 10/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 155Mpc<br /> <strong>INCOMING OPERATOR:</strong> Ibrahim<br /> <strong>SHIFT SUMMARY:</strong></p> <p>Commissioning in the morning (including a lockloss), then H1 relocked fine and has been locked the last few hours.</p> <p><u><strong>HANDOFF Note</strong></u>:&nbsp; Assuming L1 runs a calibration tonight, H1 will go out of Observing when L1 does to run another calibration since there was an update to the H1 calibration this afternoon (after this morning&#39;s calibration).&nbsp; Will let Ibrahim know about this &amp; that I confirmed this with Joe Hanson (L1 EVE operator).<br /> <strong>LOG:</strong></p> <ul> <li>1445-1800 Y-arm BTE inspection EY toward MY (randy)</li> <li>1511-1526 Optics Lab Technical Clean (nellie)</li> <li>1457-1536 Y-arm run (matt)</li> <li>1533 out of observing for COMMISSIONING <ul> <li>1533 No SQZ meas (Camilla)</li> <li>1534-1540 PEM set-up....but will be in/out during commissioning(robert)</li> <li>1547 swept sine (elenna)</li> <li>1712-1744 Calibration measurements</li> <li>1745 Robert crawling under BSC2</li> <li>1840 <strong>LOCKLOSS</strong> (Robert was crawling around BSC2) <ul> <li>Paused a few minutes to wait out BSC2 ISI WD trip from Robert &amp; then returned to locking.</li> <li>To save time, Proactively took ISC Lock to Check Mich Fringes since H1 was locked for so long &amp; assumed it would be misaligned.</li> </ul> </li> </ul> </li> <li>1553-1615 EX trip to grab a light in fan room (chris)</li> <li>1609-1631 MY parts search (travis)</li> <li>1709 Returning laptops to Cleaning Room (tony)</li> <li>2005 Back to <strong>OBSERVING</strong></li> <li>2029-2144 MY Emergency Pump work (travis)</li> <li>2107-2256 Receiving CHETA parts in JAC Lab (camilla, matt)</li> <li>2144-2148 Dropped OUT of Observing for Calibration change (elenna, jenne)</li> </ul> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87383 corey.gray@ligo.org Thu, 09 Oct 2025 16:28:45 -0700 LHO General LHO General - OPS Eve Shift Start https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87398 <p>Author: ibrahim.abouelfettouh@ligo.org</p><p>Report ID: 87398</p><p><strong>TITLE:</strong> 10/09 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 151Mpc<br /> <strong>OUTGOING OPERATOR:</strong> Corey<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 13mph Gusts, 6mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.02 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.17 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p><strong>IFO is in NLN and OBSERVING</strong></p> <p>There is a plan for coordinated calibration with LLO at 5:10 PT so will contact LLO and if ready, do a full CAL sweep.</p> <p>Nothing else of note.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87398 ibrahim.abouelfettouh@ligo.org Thu, 09 Oct 2025 16:21:45 -0700 LHO General X1 General - All 1064 [nm] HR, 45 deg AOI Optics from C2500044 Coating Run Etched with Wrong Coating Spec DCC Number https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87397 <p>Author: jeffrey.kissel@ligo.org</p><p>Report ID: 87397</p>J. Kissel, C. Gray, M. Nakano, G. Billingsley We&#39;re getting started with cleaning our 1" and 2" optics for SPI. Corey uploaded *all* of our optics (50:50 BSs, 85:15 BSs, TFPs, HR mirrors, Lenses etc.) to ICS in prep, and I reviewed the work double checking that the ICS record information makes sense. For the HR mirrors, which were part of the 2025 large custom purchase order (<a href="https://dcc.ligo.org/LIGO-C2500044">C2500044</a>) from FiveNine Optics (to be used by JAC, SQZ, the LLO TNT Lab, and SPI), he entered them into <a href="https://ics.ligo-la.caltech.edu/JIRA/secure/IssueNavigator.jspa?reset=true&&reporterSelect=specificuser&reporter=corey.gray%40ligo.org&created%3Aafter=5%2FOct%2F25&created%3Abefore=9%2FOct%2F25&customfield_10032=E1900393">ICS</a> with a key that used the DCC number that&#39;s physically etched into the barrel of the optic. HOWEVER -- the DCC number etched on the barrel of the optic is <a href="https://dcc.ligo.org/LIGO-E1900393">E1900393</a> -- E190039<b><u><font color="red">3</font></b></u>. See <a href="">attached picture</a>. That drawing number is for the coating spec of <b>0-25 deg AOI</b> HR mirrors. The physical coating spec we want, was provided, and bought was for 45 deg AOI, i.e. <a href="https://dcc.ligo.org/LIGO-E1900392">E1900392</a> -- E190039<b><u><font color="red">2</font></b></u> (one DCC number lower). So <b>these HR optics, coated with E1900392 spec, bought with C2500044, which have vendor run numbers 1895 and 1897, have the incorrect DCC number for the spec etched on the barrel.</b> If you head to the purchase order, C2500044, and look at the FNO_4787-1.pdf attachment, it clearly states (twice!) "[...] per drawing E1900392-V2. Serialization per E1900392-V2." However, if you then *read* <a href="https://dcc.ligo.org/LIGO-E1900392-v2">E1900392-v2</a>, section 8 states equally clearly "Each optic should be serialized and marked with the following code/description: 1" optics: E190039<b><u><font color="red">3</font></b></u>-v2-01 S/N:01 HR1064+532 with incremental S/N: 01, 02, 03, ... 2" optics: E190039<b><u><font color="red">3</font></b></u>-v2-02 S/N:01 HR1064+532 with incremental S/N: 01, 02, 03, ..." Thankfully we <i>know</i> the coating is the correct E1900392 coating -- (1) The PCAL team confirms via measurement at 45 deg AOI, that these have transmission at the level of ~5e-5 W/W, so these will serve excellently as HR mirrors at 45 deg AOI. See <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86699">LHO:86699</a> (2) The vendor&#39;s data, posted to <a href="https://dcc.ligo.org/LIGO-C2500186">C2500186</a>, (Even though the run numbers listed on the first page of the data for the <a href="https://dcc.ligo.org/DocDB/0202/C2500186/001/HR_mirror_main1_vendordata.pdf">First Batch</a> are quoted as "V2-<font color="red"><u><b>2</b></u>895</font>" and "V2-1897" we know the run numbers are V2-<b><u>1</u></b>895 and 1897 from what&#39;s written on the containers the optics came in; see <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87397_20251009160516_C2500044_HRMirror_Optics_Cases.jpg">attached picture</a>) show figures with captions indicating the data is from AoIs of 38, 45, and 50 deg, a reasonable range of AoI&#39;s to test for a 45 deg AoI mirror; and conversely no measurement of anything at AoIs less than 25 deg, which would be what one would report for a coating that&#39;s spec&#39;d with the *actual* E1900393 spec. (3) The E1900392 spec specificies a 45 deg AoI. So, now we just have to figure out how to keep track of this information when we&#39;re in the lab / in the chamber, 5 years later, and the optics are no where near their cases and a brand new person is using the optics. C&#39;est le vie! <!--- Output file_1_87397 div --> <div id="file_1_87397" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87397 div --> </div> <!--- Output files_1_87397 div --> <div id="files_1_87397" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87397_20251009153131_2025-10-08_FiveNines_HROptic_CoatingSpec_Etching.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87397_20251009153131_2025-10-08_FiveNines_HROptic_CoatingSpec_Etching.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87397_20251009160516_C2500044_HRMirror_Optics_Cases.jpg" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87397_20251009160516_C2500044_HRMirror_Optics_Cases.jpg" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87397 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87397 jeffrey.kissel@ligo.org Thu, 09 Oct 2025 16:13:44 -0700 X1 General H1 CAL - Comment to Some attempts to fix the calibration https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87396 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87396</p><p>It turns out that changing the&nbsp;<code>H1:CAL-CS_DARM_FE_ETMX_L3_DRIVEALIGN_L2L_GAIN</code> was the WRONG thing to do. The point was to only update the drivealign gain to bring us back to the N/ct actuation strength of the model. We lost lock shortly after I updated the drivealign gains, so I didn&#39;t realize the error until just now when I checked the grafana page and saw that the monitoring lines were reporting 10% uncertainty!</p> <p>Vlad and Louis helped me out. By going out of observing and changing the&nbsp;<code>H1:CAL-CS_DARM_FE_ETMX_L3_DRIVEALIGN_L2L_GAIN</code> back to the old value (88.285), I was able to bring the monitoring line uncertainty back down to its normal value (2%). I have undone the SDF in the CAL CS model to correct this.</p> <p>The observing time section with this error is from 1444075529 to 1444081417.</p> <p>Updating this alog after discussion with the cal team to include a detchar-request tag. Please veto the above time!</p> DetChar-Request <!--- Output file_1_87396 div --> <div id="file_1_87396" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87396 div --> </div> <!--- Output files_1_87396 div --> <div id="files_1_87396" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87396_20251009145244_CAL_CS_undo.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87396_20251009145244_CAL_CS_undo.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87396 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87396 elenna.capote@ligo.org Thu, 09 Oct 2025 15:05:24 -0700 H1 CAL H1 SEI - Earthquake response https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87395 <p>Author: thomas.shaffer@ligo.org</p><p>Report ID: 87395</p><p>I updated Jim&#39;s &quot;rasta plot&quot; with a line for when Jim thinks we should turn on the high ASC to help us ride through earthquakes. This is a guess and will need more tested times, so we will very likely make changes to this in the near future.&nbsp;<strong>Operators, please transition to the high ASC before the earthquake arrives.</strong>&nbsp;You can transition back when the earthquake has sufficiently calmed down, perhaps even waiting until the SEI_ENV node goes out of Earthquake mode.&nbsp;</p> <p>Interestingly, the M6.0 from Russia this morning would have been in the high ASC realm, but we looked to have scraped by and survived.&nbsp;</p> <p>I&#39;m ready to test the Guardian version of this high ASC switch whenever we get the chance. We had a lock loss just before trying it today, so perhaps Monday or opportunistically over the weekend. In the mean time operators will have to do the switching manually.</p> OpsInfo <!--- Output file_1_87395 div --> <div id="file_1_87395" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87395 div --> </div> <!--- Output files_1_87395 div --> <div id="files_1_87395" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87395_20251009143847_rasta_flag_w_dots.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87395_20251009143847_rasta_flag_w_dots.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87395 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87395 thomas.shaffer@ligo.org Thu, 09 Oct 2025 14:40:44 -0700 H1 SEI H1 SEI - HAM2,3,6 coupling to DARM https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87393 <p>Author: jim.warner@ligo.org</p><p>Report ID: 87393</p><p>Over the last several weeks, I have collected some HAM ISI to DARM coupling measurements. These are the only HAM ISI that don&#39;t have st0 L4C feedforward, and should have overall not as good performance as the other HAMs. Attached pdfs show the coupling to darm for the closest analogs to their associate cavity length, pitch, yaw and vertical dofs. It seems like HAM2 generally has the worst coupling, then HAM6, then HAM3. HAM2 is already planned to receive st0 l4cs in the next vent, as well as lower noise vertical CPS. HAM3 is only planned to receive the lower noise CPS, for now.&nbsp;For HAM6,&nbsp;I have been trying ground to HEPI l4c feedforward, but so far haven&#39;t found a stable filter and don&#39;t yet understand why that feedforward is not work at HAM6 yet.</p> <!--- Output file_0_87393 div --> <div id="file_0_87393" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87393 div --> </div> <!--- Output files_0_87393 div --> <div id="files_0_87393" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87393_20251009114632_ham2_darm.pdf" target="blank">ham2_darm.pdf</a></div> </div> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87393_20251009114637_ham3_darm.pdf" target="blank">ham3_darm.pdf</a></div> </div> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87393_20251009114641_ham6_darm.pdf" target="blank">ham6_darm.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87393 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87393 jim.warner@ligo.org Thu, 09 Oct 2025 12:03:51 -0700 H1 SEI H1 CAL - Some attempts to fix the calibration https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87390 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87390</p><p>We noticed that comparing the last two calibration reports that there has been a significant change in the systematic error,&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87295">87295</a>. It&#39;s not immediately obvious what the cause of this is. Two current problems we are aware of: there is test mass charge, and kappa TST is up by more than 3%, and we lost another 1% optical gain since the power outage.</p> <p>One possible source is the SRC detuning changing (not sure how this could happen, but it might change).</p> <p>Today, I tried to correct some of these issues.</p> <p><strong>Correcting actuation:</strong></p> <p>This is pretty straightforward, I measured the DARM OLG and adjusted the L3 DRIVEALIGN gain to bring the UGF back t about 70 Hz, and Kappa TST back to 1. This required about a 3.5% reduction in the drivealign gain, from 88.285 to 85.21. I confirmed that this did the right thing by comparing the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113227_DARM_OLG_charge_correction.png">DARM OLG</a> to an old reference and watching <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113230_kappa_tst_drivealign_gain.png">kappa TST</a>. I updated the guardian with this new gain, <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113234_DRIVEALIGN_SDF.png">SDFed</a>, and changed the standard calibration pydarm ini file to have this new gain. I also remembered to update this gain in the <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113647_drivealign_calcs.png">CAL CS model</a>.</p> <p><strong>Correcting sensing:</strong></p> <p>Next, Camilla took a sqz data set using FIS at different SRCL offsets,&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87387">87387</a>. We did the usual 3 SRCL offset steps, but then we were confused by the results, so we added in a fourth at -450 ct. Part of this measurement requires us to guess how much SRCL detuning each measurement has, so we spent a bunch of time iterating to make our gwinc fit match the data in <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113901_SRCL_detuning_model_vs_meas_dB.png">this plot</a>. I&#39;m still not sure we did it right, but it could also be something else wrong with the model. The <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113905_SRCL_detuning_vs_SRCL_offset_fit.png">linear fit</a> suggests we need about a -435 ct offset. We changed the offset following this result.</p> <p><strong>Checking the result:</strong></p> <p>After these changes, Corey ran the usual calibration sweep. The<a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009114232_PCAL_BB_10_9_25.png"> broadband comparison</a> showed some improvement in the calibration. However, the <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87384">calibration report</a> shows a significant spring in the sensing function. To compare how this looks relative to previous measurements, I plotted the last three sensing function measurements.</p> <p>The calibration was still with 1% uncertainty on 9/27. On 10/4, the calibration uncertainty increased. Today, we changed the SRCL offset following our SQZ measurement. <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009114621_sensing_SRCL_offset_compare.pdf">This plot</a> compares those three times, and includes the digital SRCL offset engaged at the time. I also took <a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009114624_sensing_SRCL_offset_compare_ratio.pdf">the ratio</a> of each measurement with the measurement from 9.27 to highlight the differences. It seems like the difference between the 9/27 and 10/4 calibration cannot be attributed much to a change in the sensing. And clearly, this new SRCL offset makes the sensing function have an even larger spring than before.</p> <p>Therefore, I concluded that this was a bad change to the offset, and I reverted. Unfortunately, it&#39;s too late today to get a new measurement. Since we have changed parameters, we would need a calibration measurement before we could generate a new model to push. Hopefully we can get a good measurement this Saturday. Whatever has changed about the calibration, I don&#39;t think it&#39;s from the SRCL offset. Also, correcting the L3 actuation strength was useful, but it doesn&#39;t account for the discrepancy we are seeing.</p> <!--- Output file_1_87390 div --> <div id="file_1_87390" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87390 div --> </div> <!--- Output files_1_87390 div --> <div id="files_1_87390" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113227_DARM_OLG_charge_correction.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009113227_DARM_OLG_charge_correction.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113230_kappa_tst_drivealign_gain.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009113230_kappa_tst_drivealign_gain.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113234_DRIVEALIGN_SDF.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009113234_DRIVEALIGN_SDF.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113647_drivealign_calcs.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009113647_drivealign_calcs.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113901_SRCL_detuning_model_vs_meas_dB.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009113901_SRCL_detuning_model_vs_meas_dB.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113905_SRCL_detuning_vs_SRCL_offset_fit.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009113905_SRCL_detuning_vs_SRCL_offset_fit.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009113909_displacement_spectra_SRC_detuning.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009113909_displacement_spectra_SRC_detuning.png" class="outputImg" /></a> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009114232_PCAL_BB_10_9_25.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87390_20251009114232_PCAL_BB_10_9_25.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87390 div --> </div> <!-- Output break div. --> <div class="break"></div> <!--- Output file_0_87390 div --> <div id="file_0_87390" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87390 div --> </div> <!--- Output files_0_87390 div --> <div id="files_0_87390" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009114621_sensing_SRCL_offset_compare.pdf" target="blank">sensing_SRCL_offset_compare.pdf</a></div> </div> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87390_20251009114624_sensing_SRCL_offset_compare_ratio.pdf" target="blank">sensing_SRCL_offset_compare_ratio.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87390 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87390 elenna.capote@ligo.org Thu, 09 Oct 2025 11:50:15 -0700 H1 CAL H1 General - Commissioning Lockloss at 1840utc https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87394 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87394</p><p>Just had a lockloss while Robert was out on the floor during commissioning time (ends a 20.5+hr lock).</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87394 corey.gray@ligo.org Thu, 09 Oct 2025 11:49:08 -0700 H1 General H1 SQZ - Comment to No SQZ Time, Checked NLG https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87391 <p>Author: camilla.compton@ligo.org</p><p>Report ID: 87391</p><p>Elenna noticed this OPO temp change made SQZ worse at the yellow BLRMs. I then ran SQZ_OPO_LR&#39;s SCAN_OPOTEMP state which moved the OPO temp further in the same direction. This unlocked SQZ but shouldn&#39;t have but did make the yellow BLRMs better.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87391 camilla.compton@ligo.org Thu, 09 Oct 2025 11:36:19 -0700 H1 SQZ H1 CAL - Comment to Thurs H1 Calibration Measurement (broadband headless + simulines) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87389 <p>Author: elenna.capote@ligo.org</p><p>Report ID: 87389</p><p>Still having this weird error with the report generation. I regenerated, see the attachment.</p> <p>I&#39;m unhappy with this result, but that requires more detail to explain, alog incoming. In quick summary, I don&#39;t think I will be validating this report.</p> <!--- Output file_0_87389 div --> <div id="file_0_87389" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87389 div --> </div> <!--- Output files_0_87389 div --> <div id="files_0_87389" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87389_20251009111018_H1_calibration_report_20251009T172027Z.pdf" target="blank">H1_calibration_report_20251009T172027Z.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87389 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87389 elenna.capote@ligo.org Thu, 09 Oct 2025 11:11:12 -0700 H1 CAL H1 CAL - Thurs H1 Calibration Measurement (broadband headless + simulines) https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87384 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87384</p><p><em>NOTE:&nbsp; For this particular Thurs Calibration, Commissioning work was done first for almost 2-hrs and then this Calibration was run.</em></p> <p><strong>Measurement NOTES:</strong></p> <ul> <li>Following instructions (<a href="https://cdswiki.ligo-wa.caltech.edu/wiki/TakingCalibrationMeasurements">link</a>)</li> <li>H1 at NLN for for ~19+hrs</li> <li>Calibration_Monitor medm screenshot is attached</li> <li><em>This Calibration was run after about 2.25hrs of commissioning&nbsp;</em></li> <li>&nbsp;Broadband measurement started at&nbsp; 17:12:31 utc ended 17:18:04utc</li> <li>Measurement at:&nbsp; /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20251009T171253Z.xml</li> <li>&nbsp;Simullines measurement <ul> <li>gps START time:&nbsp;1444065645.179760&nbsp; (1720utc)</li> <li>gps STOP time:&nbsp; 1444067041.828354&nbsp;(1743utc)</li> <li>&nbsp;File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20251009T172027Z.hdf5</li> <li>File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20251009T172027Z.hdf5</li> <li>File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20251009T172027Z.hdf5</li> <li>File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20251009T172027Z.hdf5</li> <li>File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20251009T172027Z.hdf5</li> </ul> </li> <li>&nbsp; utc ISC_LOCK taken back to NLN &amp; started commissioning</li> <li>PDF of PYDARM Report is attached also.</li> </ul> CAL <!--- Output file_0_87384 div --> <div id="file_0_87384" class="commentHdr"> Non-image files attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_0_87384 div --> </div> <!--- Output files_0_87384 div --> <div id="files_0_87384" class="reportDetails"> <div class="uploadedImg"> <div class="uploadedFileType"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/images/pdf.gif" class="" /></div> <div class="uploadedFileName"><a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87384_20251009105030_H1_calibration_report_20251009T172027Z.pdf" target="blank">H1_calibration_report_20251009T172027Z.pdf</a></div> </div> <!-- Output break div. --> <div class="break"></div> <!--- Close files_0_87384 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87384 corey.gray@ligo.org Thu, 09 Oct 2025 10:50:40 -0700 H1 CAL LHO VE - Thu CP1 Fill https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87388 <p>Author: david.barker@ligo.org</p><p>Report ID: 87388</p><p><strong>Thu Oct 09 10:08:21 2025 INFO: Fill completed in 8min 18secs</strong></p> <p>Gerardo confirmed a good fill curbside.</p> <!--- Output file_1_87388 div --> <div id="file_1_87388" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87388 div --> </div> <!--- Output files_1_87388 div --> <div id="files_1_87388" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87388_20251009104311_CP1-1279.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87388_20251009104311_CP1-1279.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87388 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87388 david.barker@ligo.org Thu, 09 Oct 2025 10:43:14 -0700 LHO VE H1 SQZ - SQZ FIS SRCL Offset Brontosaurus Plot https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87387 <p>Author: camilla.compton@ligo.org</p><p>Report ID: 87387</p><p><em>Elenna, Camilla, Matt</em></p> <div>We took the data for the SRCL offset SQZ brontosaurs plots as in <a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=86737">86737</a>. Plot saved in <em><code>camilla.compton/Documents/sqz/templates/dtt/20251009_SRCLSQZdata.xml&nbsp;</code></em><code>and </code><a href="https://alog.ligo-wa.caltech.edu/aLOG/uploads/87387_20251009095214_SRCL.png">attached.</a></div> <div>&nbsp;</div> <div> <table border="1" cellpadding="1" cellspacing="1" style="width:750px"> <tbody> <tr> <td><strong>Type</strong></td> <td><strong>Time (UTC)</strong></td> <td><strong>SRCL Offset</strong></td> <td><strong>Angle</strong></td> <td><strong>DTT Ref </strong></td> </tr> <tr> <td>NoSQZ</td> <td>15:34:00 - 15:42:00</td> <td>-382</td> <td>N/A</td> <td>ref 0</td> </tr> <tr> <td>FIS SQZ</td> <td>16:01:00 - 16:04:00</td> <td>-382</td> <td>(-)154.7</td> <td>ref 1</td> </tr> <tr> <td>FIS SQZ</td> <td>16:06:30 - 16:09:30</td> <td>-200</td> <td>(-)210.6</td> <td>ref 2</td> </tr> <tr> <td>FIS SQZ</td> <td>16:13:45 - 16:16:45</td> <td>0</td> <td>(+)135.6</td> <td>ref 3</td> </tr> <tr> <td>FIS SQZ</td> <td>16:49:30 - 16:52:30</td> <td>-450</td> <td>(-)144.6</td> <td>ref 4</td> </tr> </tbody> </table> </div> <p>Took above data at <strong>NLG of 21.9</strong>, measaured eariler&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87385">87385.</a></p> <!--- Output file_1_87387 div --> <div id="file_1_87387" class="commentHdr"> Images attached to this report <!-- Output break div. --> <div class="break"></div> <!--- Close file_1_87387 div --> </div> <!--- Output files_1_87387 div --> <div id="files_1_87387" class="reportDetails"> <a href="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/87387_20251009095214_SRCL.png" target="blank"><img src="https://www-alog1.ligo-wa.caltech.edu/aLOG/uploads/tn/tn_87387_20251009095214_SRCL.png" class="outputImg" /></a> <!-- Output break div. --> <div class="break"></div> <!--- Close files_1_87387 div --> </div> <!-- Output break div. --> <div class="break"></div> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87387 camilla.compton@ligo.org Thu, 09 Oct 2025 09:53:23 -0700 H1 SQZ LHO General - Comment to Thurs DAY Ops Transition https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87386 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87386</p><p>Did the Dust Monitor Check and a new (to me atleast) problem would be for DR1 (Diode Room 1).</p> PEM https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87386 corey.gray@ligo.org Thu, 09 Oct 2025 08:50:39 -0700 LHO General H1 SQZ - No SQZ Time, Checked NLG https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87385 <p>Author: camilla.compton@ligo.org</p><p>Report ID: 87385</p><p>We went into no SQZ from 15:34UTC to 15:42UTC. I checked NLG as in&nbsp;<a href="https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=76542">76542</a>.&nbsp;</p> <table border="1" cellpadding="1" cellspacing="1" style="width:700px"> <tbody> <tr> <td><strong>OPO Setpoint</strong></td> <td><strong>Amplified Max</strong></td> <td><strong>Amplified Min</strong></td> <td><strong>UnAmp</strong></td> <td><strong>Dark</strong></td> <td><strong>NLG </strong></td> </tr> <tr> <td>80</td> <td>0.0134871</td> <td>0.00017537</td> <td>0.0005911</td> <td>-2.57e-5</td> <td><strong>21.9</strong></td> </tr> </tbody> </table> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87385 camilla.compton@ligo.org Thu, 09 Oct 2025 08:43:11 -0700 H1 SQZ LHO General - Thurs DAY Ops Transition https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87382 <p>Author: corey.gray@ligo.org</p><p>Report ID: 87382</p><p><strong>TITLE:</strong> 10/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC<br /> <strong>STATE of H1:</strong> Observing at 155Mpc<br /> <strong>OUTGOING OPERATOR:</strong> TJ<br /> <strong>CURRENT ENVIRONMENT:</strong><br /> &nbsp; &nbsp; SEI_ENV state: CALM<br /> &nbsp; &nbsp; Wind: 5mph Gusts, 4mph 3min avg<br /> &nbsp; &nbsp; Primary useism: 0.08 &mu;m/s<br /> &nbsp; &nbsp; Secondary useism: 0.18 &mu;m/s&nbsp;<br /> <strong>QUICK SUMMARY:</strong></p> <p>H1&#39;s been locked 16.5+hrs (even rode through an M6.0 Russia EQ an hr ago!).&nbsp;&nbsp;</p> <p><u><strong>OVERNIGHT</strong></u>:&nbsp; SQZ dropped H1 from Observing for 4min due to the PMC.&nbsp; NO Wake up Calls!</p> <p><u><strong>ALSO</strong></u>:&nbsp; Thurs Calibration from 830-noon (local time)...where Calibration will be deferred to later in the morning for Elenna task and/or Robert task starting things off.</p> https://www-alog1.ligo-wa.caltech.edu/aLOG/index.php?callRep=87382 corey.gray@ligo.org Thu, 09 Oct 2025 07:41:18 -0700 LHO General