Kyle - replace transducer at EX

TMSX measurements lst night

TMSX - Keita and Corey in AM - Betsy, Jeff, Andres in PM - gone now - TF running

BS - alignment in LVEA test stand - some alarms

IMC - Jamie working on Guardian, IMC has drifted out of alignment, WFS won't engage, left off waiting fix

After modifying the signs of the gains from the medm, I took a new set of transfer functions of phase 3b (under vacuum) M2 mass of the beamsplitter over the last week end (cf alog 7677 and 7693). During the measurement, the ISI was damped. The plots of the attached document are described below :

- H1 SUS BS M2-M2 undamped transfer functions phase 3b with corrected gain signs (Sept 06th 2013 19:00, in black) compared against H1 SUS BS M2-M2 undamped tf (Sept 06th 2013 15:00, in orange) against the model in blue.

The last measurements are showing a very good match with the model

Will fix tomorrow (after wasp hive relocated)

Last Friday, I was mainly searching for the 6.18Hz in the HEPI and ISI actuators/sensors. There was no real conclusion from the study except that the 6.18Hz was not coming from HEPI and it was visible mainly in the vertical degrees of freedoms.

Then, the SUS was suspected. Few tests were done:
- The damping loop and the coil drivers were unplugged. The 6.18Hz didn’t show up in the ISI spectra.
- The coil drivers were re-plugged. The 6.18Hz didn’t show up in the ISI spectra.
- Then, the damping loops were turned on independently. It appears that main chain damping loops using the left and right OSEMs create the vertical motion at 6.18Hz. Then, this motion is transmitted to the ISI and spectra show a 6.18Hz feature.

Two MO OSEM sensor spectra are presented in attachment. In both cases, the ISI is isolated.
- Without SUS Damping (first figure)
- With SUS Damping

J.K and A.P are taking open loop transfer functions.

During the hunt, I saw some excess noise on R0 OSEM RT

Added h1iscex channels to the DAQ. 

Stopped h1fw1 writing frames and un-mounted disk system. Dan then replaced both controller cards on the MSR SATABOY RAID. Once the file system was available again, I re-mounted and restarted h1fw1. The data gap on this frame writer is from 11:33 to 13:43 local time. h1fw0 was writing frames the whole time.

Created a new MEDM screen to show GPS diagnostics for the Timing Master unit. It was attached to the SITEMAP via a new SYS related display button. On the next DAQ restart these channels will be added to the frames.

Restarted the h1fe-cds EPICS gateway to see if this sped up the reconnection of MEDM to the Guardian IOCs. It did help somewhat but the reconnection is still slow.

At End X, we relocated the garbing clean room back to the E-module, replaced the curtains and restocked.
Tyler assisted Thomas Vo and Lisa Austin with Ham 4 & 5 baffle assemblies.

We're done with in-vac cable test.

Tomorrow Corey needs to re-rout the cables on ISI back to the intended position (i.e. closer to the real feedthrough).

I spoke to the folks at Craftsman today. The trim pieces have been ordered and are due in next Tuesday, 17 September. Installation is scheduled for that day as well.

Transfer functions of the ITMX at the test-stand have been running overnight yesterday, after last alignement. The attached plots are showing :

(1) M0-M0 undamped transfer functions for the 6 dofs, compared against  "wire rehang" model

(2) R0-R0 undamped transfer functions for the 6 dofs, compared against "thincp" model

Main chain was showing source of rubbing (all dofs of first attachement, except yaw). It turned out that during those measurements, an EQ stop was touching the top of the M0 test mass (main chain). It has been pulled back this morning. Reaction chain looks similar to the model, except for pitch, which we assume

(3) Spectra of ITMX in euler basis for main and reaction chain :

-after alignement of main chain, reaction chain not aligned (blue curve Sept 04th )

-after alignement of main and reaction chain, EQ stop touching the test mass (green curve Sept 10th)

-after alignement of main and reaction chain, after pulling back the EQ stop (red curve Sept 10th)

Looking at the vertical dof of main chain for eg, page 9, we can see that the frequency of the first mode of vertical (0.55Hz) reappeared after the EQ has been moved. 

Data, script and result files will be commited on the svn after this entry.

Transfer functions for ITMX will be running again overnight

ITMY Coil driver outputs were disconnected from field satellite units to help Vincent with 6.18Hz noise search at noon. See alog:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=7609

Dave B. added h1iscex model to the DAQ, DAQ restart
10:26 Dave B. restarted the EPICS gateway between the ops and fe LANs to diagnose the guardian software.
11:07 Cyrus R. changed HVE-EX:INSTAIR_PT599.LOW to 55
11:33 Dave B. restarting fw1 for disk repair

• ITMx
  • Pitch Error: 100 µrad up
    • Actual Pitch: 519 µrad down
    • Target Pitch: 619 µrad down
    • Tolerance: ±50 µrad
    • This was deemed good enough for the cartridge alignment and will be fine tuned to within tolerance once the cartridge is installed in WBSC3
  • Yaw Error: 30 µrad CCW
    • Target Yaw: 0.0 µrad
    • Tolerance: ±50 µrad
• CPx
  • Pitch Error: 145 µrad up
    • Actual Pitch: 1.255 mrad down
    • Target Pitch: 1.4 mrad down
    • Tolerance: ±1.4 mrad
  • Yaw Error: 291 µrad CCW
    • Target Yaw: 0.0 µrad
    • Tolerance: ±1.4 mrad
• ITMx/CPx Gap: 20.33 mm
  • Target: 20.0 mm
  • Tolerance: ±0.25 mm
  • Per Betsy, this is good enough for this pilot ITMx

To be on the safe side, I left the IAS equipment set up at the test stand until we get a good set of transfer funtions.

I've updated the low level alarm level settings on h0veex at the request of Patrick/Kyle for channel HVE-EX:INSTAIR_PT599.  The old value was '59', the new value is '55' for 'HVE-EX:INSTAIR_PT599.LOW'.  The DB file has been modified on vxboot to preserve this setting across VME boots, in addition to changing the current value via caput.

TMSX transfer functions are showing a bad coherence (see the attached snapshot of the dtt session for the pitch to pitch transfer function). Excitation was uniform white noise of amplitude 2500 from 0 to 50Hz, with a 0.01Hz bandwidth for Pitch

I told Corey and Keita to go ahead for cable testing, I will try new settings when they will be done.

(Kiwamu, Alexa)

 With the ISCTEY Prometheus laser set as follows,

PPKTP Crystal @ 32.27 C

NPRO Crystal @ 24.00 C

Diode A @ 23.00 C

Diode B @ 21.00 C

we measured the Current (A) vs Power(W) out of the laser aperature for the 1064nm beam (see pdf file).

We found the optimal configuration for the laser to be,

PPKTP Crystal @ 33.81 C

NPRO Crystal @ 24.00 C

Diode A @ 23.00 C

Diode B @ 21.00 C

Current 1.503A

such that at the aperature, the power of each beam was,

1064nm: 1.371W

532nm: 40.1mW

In this optimal configuration, we measured the power after the quarter-wave plate (QWP), half-wave plate (HWP), and Faraday Isolator (FI) for the 1064nm beam, and found it to be 1.282W. Thus, we deduced that the throughput of the FI was about 93%. Then we proceeded to examine the beam profile with the nanoscan.

The first picture (1064nmNoFI.pdf) shows the beam profile immediatly following the aperature of the laser.

The second picture (1064nmFILowCurrent.pdf) shows the beam profile after the FI with the current set to 0.803A (about 10mW of power)

The third picture (1064nmFIFullCurrent.pdf) shows the beam profile after the FI with the current set to 1.503A (about 100mW of power)

In these images, the top graph is of the horizontal profile and the lower graph is of the vertical profile. Immediatly after the laser aperature, we see a nice gaussian profile for the vertical profile. As expected, the horizontal profile does not fit a guassian as nicely. After the FI, the vertical profile deviates from the guassian shape. We attempted to adjust the FI alignment in order to improve this profile; however, it only worsened the profile. (Tomorrow I will collect raw data of the beam profiling after the FI).

(Note: See D1100607-v13 for table layout as a reference)

(Note: Temporary shin was placed below FI to obtain 4in required height)