J. Kissel

After chamber closeout, and subsequent close up, I've gathered a set of TFs for H1 SUS ETMX. I attach the results, all looks quite well, and ready for pump-down! I've left the ISI ETMX undamped with the MASTERSWITCH ON, and H1 SUS ETMX and H1 SUS TMSX are damped.

Of interesting note -- checkout the P to P transfer function comparison between the main chains for H1 ETMX, H1/H2 ETMY, and L1 ETMX, on pg 5 of allquads_2013-12-04_Phase3a_H1SUSETMX_ChamberCloseout_ALL_ZOOMED_TFs.pdf. It appears the 2nd Pitch mode (modeled to be at 1.31 [Hz]), whose motion is the top-three masses pitching in concert, differentially with the test mass, is different from the model, and different between these three examples. The one just measured here, H1 ETMX, seems to have the lowest frequency mode of the three, but all are within 6% of the model (-5.34%, 1.37%, 2.90%, respectively). Definitely not a show stopper, but something to consider when designing high-performance damping filters for this DOF -- the gain bump for this mode will have to be reasonably wide if we wanna use the same filter for every ETM.

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Details:

Data was taken with DTT, using the following templates,
${SusSVN}/sus/trunk/QUAD/H1/ETMX/SAGM0/Data/
2013-12-04_0146_H1SUSETMX_M0_Mono_WhiteNoise_L_0p01to50Hz.xml
2013-12-04_0146_H1SUSETMX_M0_Mono_WhiteNoise_P_0p01to50Hz.xml
2013-12-04_0146_H1SUSETMX_M0_Mono_WhiteNoise_R_0p01to50Hz.xml
2013-12-04_0146_H1SUSETMX_M0_Mono_WhiteNoise_T_0p01to50Hz.xml
2013-12-04_0146_H1SUSETMX_M0_Mono_WhiteNoise_V_0p01to50Hz.xml
2013-12-04_0146_H1SUSETMX_M0_Mono_WhiteNoise_Y_0p01to50Hz.xml

${SusSVN}/sus/trunk/QUAD/H1/ETMX/SAGR0/Data/
2013-12-05_0152_H1SUSETMX_R0_WhiteNoise_L_0p01to50Hz.xml
2013-12-05_0152_H1SUSETMX_R0_WhiteNoise_P_0p01to50Hz.xml
2013-12-05_0152_H1SUSETMX_R0_WhiteNoise_R_0p01to50Hz.xml
2013-12-05_0152_H1SUSETMX_R0_WhiteNoise_T_0p01to50Hz.xml
2013-12-05_0152_H1SUSETMX_R0_WhiteNoise_V_0p01to50Hz.xml
2013-12-05_0152_H1SUSETMX_R0_WhiteNoise_Y_0p01to50Hz.xml

Data was exported, processed, saved, using the usual tools,
${SusSVN}/sus/trunk/QUAD/Common/MatlabTools/
plotquad_dtttfs.m
plotallquad_tfs.m
the latter of which has had its measurement list updated, and is now committed to the repo as with all the above mentioned data and plots.

Post closeout transfer functions will be running on BSC-ETMX, once SUS is done, starting from 9.30 PCT tonight.

Clean room was moved from BSC 6 to BSC 10, work platform disassembled at BSC 6 and reassembled around BSC 10.
Clean room then moved back over BSC 10.
E module relocated to east side of test stand clean room (only 3 bolts per leg) and in position. TIGHT FIT
West door installed on BSC 9 and bolts torqued. Only 4 bolts in dome and east door, remainder to be installed and torqued tomorrow.

After the ACB crew finished this morning, Travis, Jim and I finished the rest of the closeout work:

- Reapplied FC to ETMx-HR thin alignment windows

- Set and secured all 72 ETMx SUS EQ stops

- Set 4 top stage BOSEMs to counter upcoming buoyancy shift under vac (Left, Right BOSEMs on M0 and R0)

- Removed the ACB locking bracket and 4 screws

- Performed chamber inspection for tools, FC on viewports, tokk a few pix, etc.

- Wiped and wiped and wiped some SUS, ACB, TMS surfaces and the floor many times ("good" IPA + alpha 10 wipes)

- Added a witness plate to the vertical holder mounted off the bottom of the front of the QUAD lower structure (LS)

- Added a 1" witness optic + PEEK holder to side of the QUAD LS

- Pulled the FC from the ETMx-HR and blew with ~10psi Top Gun N2 and inspected

- Blew the TMS telescope mirrors - didn't look great, but lots of stuff lifted with the blowing

- Unlocked the ISI

- Damped ETMx to make sure it seemed healthy

- Placed 2 witness plates (not in holders since I didn't have any with me), one directly under the QUAD, one under the front of ACB towards the tube (these should be pulled asap at next vent!)

- Left Apollo to toss the door on

Steps taken to commission the ITMY ring heater pair:
- Updated to the recently committed Beckhoff code that Joe B and Adam M worked on yesterday.
- Added the calibration values that Aidan B had recommended for running the ring heaters.
- Opened up a strip tool to monitor the vacuum pressure with the closest gauge (HVE-LY:Y1_120BTORR)
- Turned the ring heaters on to low power (~.01 Watts) to make sure that the channels were working properly
- Increased the power to 1 Watt for a 4 hour period starting at 12:00PM Pacific Time, keeping an eye on the pressure gauge previously mentioned.


Upper:
Requested Power = 1.00 Watts
Measured Voltage = 5.94 Volts
Measured Current = 0.17 Amps 
Calculated Power = .99 Watts
Calculated Resistance = 34.94 Ohms

Lower:
Requested Power = 1.00 Watts
Measured Voltage = 5.92 Volts
Measured Current = 0.16 Amps 
Calculated Power = .98 Watts
Calculated Resistance = 37.0 Ohms

A four hour trend of the pressure gauge and ring heater settings is attached.

A quick, back-of-the-envelope calculations shows that the ring heaters are working properly. The next step for measuring the thermal lensing would be to measure the beam diameter of a single reflection off of the back of ITMX independently and then changing the radius of curvature of ITMY using the ring heater to match. This requires looking at the REFL beam either in the HAM1 chamber or on the ISCT1 table, depending on how much power we are able to get out of REFL.  The Thorlabs beam profile we have on site requires a minimum of ~1e-5 Watts of incident beam power to function.

Day's Activities:

Swapping out PSL Chasis (Filiberto)

Greg craning dewar over Beam Tube in LVEA

Move ITMy Lower Structure to LVEA (Jeff/Andres)

Tumbleweed baling on X-arm

Lots of Apollo activity at EY (moving cleanrooms, platforms, E-module; installing BSC6 door, installing hard covers on Spool)

PSL work by Kiwamu (investigating mysterious RF jump by unplugging EOM cable); external shutter was also closed.  EOM was fixed in situ

PSL Shutter was replaced (Gerardo, Joe D.)

ACB work at EX (Gerardo/Mitch)

SUS work at EX (Betsy/Travis)

Had a couple of IOP SUS Watchdog INVALID alarms during shift; not really sure of the cause (also popped up window stating:  "Channel Access Exception...")

PSL Checks:

• Laser:  ON (in lower power mode), Watchdog is active/green, Status GOOD
• PMC:  6+days of lock, and reflected power at ~10%
• FSS:  locked for last 16hrs, Trans PD has been around 1V for many days
• ISS:  Diffracted power good and saturation event rate is good

Gerardo M, Mitchell R

The ETM-x Arm Cavity Baffle has been dog clamped. All class B tools and hardware has been removed from chamber. The ACB is still locked.

Bubba, Randy, Scott, Tyler, Ed, Mark, Corey, Jim

Yesterday, we completed the removal of the BSC6 cartridge. The assembly is now resting comfortably on the test-stand, 180 degrees to it's final in-chamber position (necessary for cleanroom clearances). Both suspensions are covered, and the ISI has 3 separate covers. No unusual difficulties beyond some misplaced hardware, but Apollo took an early lunch so I could scramble and find it.

Kiwamu, Stefan

Attached is a new RF return loss measurement for the EOM cable taken at the PSL rack end. This was taken after the latest RF phase jump.
As before, the marker labeled 24.08MHz is at the actual IMC modulation frequency of 24.078360MHz.

Compare this to alog 7959 (before RF jump).

Sheila and Kiwamu

We improved the clipping of the IM1 trans beam by moving the uncontrolled degree of freedom in the IMC alignment control.

As a result, the amount of the light detected at the trans PD went up from about 240 counts to more than 800 counts. Also the beam shape on the camera became more round-looking.

The clipping was mainly in yaw. The shift we introduced was visible in the IM4 trans QPD. The spot moved in yaw from -0.3 to 0.

The screen shots below are the current alignment settings that gives a less clipping on the IM1 trans beam. Note that we didn't touch IM1-4 suspensions.

Stefan and Kiwamu

We continued working on the alignment of IMC today. We managed to get the alignment back i.e. the beam hits the center of the IM4_TRANS QPD with all WFSs in action. It is now happiy locking.

However, we found that the IM1 trans path, which is used for a camera and trigger PD, seemed clipped. By moving the mirrors on IOT2L, we concluded that the clipping happened in chamber, namely in HAM2. This is not a critical issue as this light is used only for triggering purpose and it still gives a reasonable amount of the light. We will keep studying what is happening in the chamber. Perhaps this could be due to the uncontrolled degrees of freedom in the IMC alignment control.

What we did:

• We tried to bring the alignment back to a good-in-air-alignment which was established 18 th of November (see alog)
  • We tweaked both HEPIs and MC SUSs.
  • This didn't give a signal on MC2_TRANS, indicating that the cavity axis is quite off from the MC2_TRAN didoe.
• We tried to bring the alignment back to a good-in-vac-alignment which exhibited a nice long streach around 15 th of September.
  • This didn't give a signal on MC2_TRANS either, indicating that the cavity axis is quite off from the MC2_TRAN diode.
• We brought the alignment back to that of yesterday by typing in the numbers from the previous alog (see alog)
  • Note that the HEPI offsets were kept the same as that of September 15 th.
  • This gave a power build up of about 2 counts on MC2_TRANS. This is still way too low.
• The setting of the whitening filters for the MC2_TRANS QPD signals were found to be wrong.
  • In particular, the gain was too low. It was found to be 0 dB while it used to be 36 dB.
  • We found the same issue on the IM4 TRANS QPD and set it back to how they were.
  • MC2_TRANS became approximately 200 counts when it was resonance.
• Because the beam hit the MC2_TRANS, we became confident that the alignment was getting better.
• We moved on the WFS loops.
  • We flipped the demodulation phases by 90 deg to compensate the mysterious RF phase rotation.
  • All of them worked OK.
  • The loops recovered the spot position on MC2_TRANS and now it is centered well.
  • We ran mcwfsreleive to offload the control signals to the suspensions sides
• We realigned the optics on the IOT2L table.
• Then we found that the IM1 trans beam was clipped.

Sysadmin tasks: Patched internal machines accessible from outside of CDS. Performed nmap network scans on 10.20.0.0/24 and 10.101.0.0/24 subnets. Updated network drawings

h1asc0: Replaced the h1asctt model with the new h1sushtts model.

updated the H1EDCU_DAQ.ini file to trend status of all models. Updated autoBurt.req for DAQ frame writers to archive all EPICS channels associated with these systems.

Updated overvew MEDMs (for ASC TT change)

Multiple DAQ restarts were required to support these changes.

- FM-200 Systems (OSB and LSB), annual inspection took place today.
- Apollo at Y-End, working on extraction of cartridge out of BSC06.
- Baling crew @ Y-arm, baling tumbleweeds, now at X-Arm, opening a path.
- Kiwamu and Stefan, working on IMC recovery.
- Dave, some DAQ reboots.
- Thomas, to LVEA, connected TCS ring heater for ITMY.

Kyle, Gerardo 

Repair of the drying towers is done but the purge-air supply isn't available to the LVEA yet -> We still need to devise a method to demonstrate the effectiveness of the removal of the alumina dust before routing the dry air through the final filtration stages and on to the LVEA

HEPI common parts were updated yesterday per WP #4315

HEPI-HAM2 and HEPI-HAM3 were turned ON using the new Command scrips (Command2 Button from the overview screen).

They are running on their respective position loops, with the generic position blend filters (L4C=0, IPS=1).

Both HEPIs are aligned to the initial alignment position (aLog 7180)

HAM2 alignment TARGET (nm or nrad):

HAM3 alignment TARGET (nm or nrad):