After wiring up the HEPI L4-Cs to confirm they were good, I saw that two were not like the other two.  So I though they were bad and did some wiring swaps to troubleshoot the problem.  This told me it was indeed the L4-C or its local wiring.  Then I leveled them and they look fine now.  Did not realize it would be so obvious.  3 of 4 corners now level with the SE corner 3 still to do.  More visuals on the morrow.

Prep for move:
- last nights TFs corrupted by "reversed"  magnets 
- cable swap fixed the situation  (LF/RT and F2/F3)
- bosch frame wrapped in foil to calm the air current effect on TMS
- genie left out to get the best isolation for TMSX TFs

Other:
- picture of one 2" optic on TMS ISC table shows some particulate
- particulate seen on all 2" optics
- level of particulate is low enough that blowing off the surface is sufficient

In preparation for helping Cheryl clean the TMS assembly prior to its move out of the lab, I hauled a Tiger Vac and accoutrements down to the End Station. I wiped down various parts, assembled the vacuum,and applied a C-3 hose cover. The vacuum, a custom Class B attachment, and other items were placed in the lab, ready for use.

Activities from today:

H1 PSL Shutter closed (Mike/Justin)

LLO Xarm Pcal Periscope craned/crated today (Rick, Pablo, Colin)

HAM6 HEPI work:  Elec check, L4C adjustment, Actuator work. (HUGH)

Tour around 1115-noon

Starting PSL Models

SUS reboot to reproduce matrix problem (Dave)

GV6 work with aux.pump cart noise this afternoon (Kyle)

TMS crew (Jeff, Andres, Cheryl) working at EX.  The Bosch Stand is now wrapped in foil (to limit winds).

Chris Soike and I spent the afternoon de-suspending the last three iLIGO large optics (2@MMT and 1@RM) from suspensions. The optics were placed in cake tins and verified ready for shipment to CIT for storage. 

HEPI:
I checked out the HEPI system. It looks good however the horizontal actuator in corner 3 seems to be a little bit weaker (15%) than the other horizontal actuators. It's not an issue since it will be corrected with the actuator symmetrization filters.

ISI:
Due to the HEPI rewiring, I recomputed the feedforward filters from the HEPI to the ISI.

To investigate the matrix settings problem I restarted all the models on h1sush56 (including the IOP) many times. I was not able to reproduce the problem. These models are now running and burt restored to their safe.snap.

WP4093 Christina, Patrick and Dave.

We restarted the H1 PSL models h1psliss and h1pslpmc with new code Christina installed yesterday.

[Patrick, Christina]

We did a level 3 maintainance of the high power oscillator, this includes an optimization of the pump diode currents as well as the temperature of each diode. Afterwards we set the the diode currents to 100% again. This increased the output power by about 15% inside the oscillator box. 

Next step is to check the calibration of the photo diode signals.

Started TMSX transfer functions from DTT. Measurement will run overnight

[Dave Kiwamu Arnaud]

Today, we discovered that top mass OSEM2EUL matrices were set to 0 for TMSX and IM1. Also, they were frozen, and would go back to 0 right after trying to set a value in any of the slots. The recorded burt files show that values were 0 since august 30th, when rcg was updated to 2.7.

The problem was fixed by restarting the models

Stuart has been reporting a similar issue at Livingston

Picomotor controller 5 is not sending the correct readback to beckhoff, (the power on, pin 7 on the readback cable for example).  I pulled the unit and it is in the shop, I will find a tester for it in the morning.  Controller 4 is having similar problems, but I did not pull it. 

- PCAL working on LLO-Y periscope

- PSL crew work ongoing

- Sprague spraying down beam tube enclosure

- TMS crew at EX

- EY ion pump signal goes down for rerouting cables

- LN2 delivery at EX

- Kyle at GV5

- Cyrus reconfiguring and rebooting the vacuum LX VME crate

- Upgrade H1 PSL front end models

CP2 overfilled following Cyrus' reboot and BURT restore of the LX VE rack this morning -> The instrument air for CP2 indicated red or "STOP" on the MEDM screen as expected but was actually enabled as if in the "START" state -> Normally, we would be required to manually enable or "START" this via the MEDM screen following a reboot/restore and it would then indicate green -> Investigation showed a "fail" light associated with a 2210 card was on following the initial reboot -> Cyrus replaced this card, rebooted and BURT restored again -> I confirmed that the LLCV valve was now closed when the MEDM indicated "STOP" -> Later I noted that the LLCV remained closed even with 100% open PID output and with the instrument air "START" condition, i.e., the LLCV was not opening regardless of the PID output value or the enable state of the instrument air -> I confirmed that there weren't any rack fuses "lit" or open 

For now, I manually filled CP2 to 105% (boil-off rate ~2.5%/hour) and will come in early in the morning and manually fill again etc. until we find the problem.

[Stefan, Kiwamu]

 As a part of the commissioning wrap up porjects we characterized the IMC ASC control.

Adjustment of UGF:

• UGF of the all 6 loops was adjusted to be about 0.08 Hz, measured with an impulse response method
  • we had a difficulty in exciting the suspension with swept sine signals and ended up with the impulse response technique where we inject a step function at the error point and see the behavior of the error signal.
  • Later Stefan managed to measre the open loop with swep sine. See tha attachement.

Change in servo shapes:

• Looking at the spectrum of the WFS error signals we noticed there was a sharp peak at 1 Hz which is a pitch resonance of the triple suspension.
  • The height was about 10 times higher that the floor around this frequency
• We impleted a notch filter at 1 Hz with Q of 2 and heiht of 30 dB.
• Instead of enabling FM6(0.06, 0.1) we decided to go with this simple notch filter.

Adjustment of Output matrix for DOF3:

• We put non-zero numbers in the cross-coupling elements in the outmatrix for DOF3.
  • We have been using only PZT for feedabck, but this made the response of the control slow because DOF1 and 2 needed to wait and follow the movement of DOF3.
  • Instead of doing this cascaded loop we tried a simpler scheme by feeding the signal back also on the suspensions.
  • This worked well.

Some other changes :

• we increased the whitening gain of IM4 TRANS from 15 to 45 dB.
• we enabled the top two whitening stages for each WFS

Leaking joint that had been externally "VacSealed" a few weeks ago may still be leaking, albeit less than it had been -> 9 x 10-8 torr*L/sec helium background rose to 1.1 x 10-7 torr*L/sec after 150 seconds of helium applied to the bagged joint -> This needs to be repeated to confirm -> ideally the background should be lower in relation to the leak being measured for better confidence

Christina, Patrick

Yesterday, we aligned the DBB for both input beams and started checking on the measurement scripts. A tiny misalignment of the PMC input was also fixed. 

In the morning the position of the photo diode inside the Front End was changed due to ECR E1300621-v1. During that the laser was shut down because of the lid-overwrite. We restarted the laser, the power of the oscillator droped a little on the MEDM screen. However we couldn't find the reason. Now that photo diode is hit properly, the status of the noise eater can be watched on the laser MEDM screen.  

We found that the reference cavity was misaligned a little, thus, we optimized that. 

The DBB scripts were fixed and we run all the measurements for both laser systems. We also run the ISS measurement script. The performance of the lasers seems to be good. The out-of-loop noise of the ISS is a little to high, but the inloop performance indicates that the loop is working correctly. (At the moment the show references in the pdf are the measurements from Livingston. We will create our own references soon.)

BOSEMS:

- cabling issue found this AM

- BOSEMS installed and tested - two were replaced - TMSX now has 6 good BOSEMS

- BOSEM channel LEFT is reading a known good BOSEM (20K+ counts on any other channel) as 13K counts
--- Filiberto is at EX tracking down the issue.  Last info from him was that all cables have checked out OK, and he's looking at the electronics.


PREP FOR MOVE:

- telescope safety support beams attached to the top assembly


STILL TO DO - before transfer functions:
- LEFT BOSEM channel fix
- center BOSEMS
- remove protective wipes from the table, note some have visible particulate from installation activities
- check cables are not touching wires
- lower genie to allow TMS to hang freely

I have to leave for a dentist appt. but expect to resume leak checking GV6 when I return (1530?) -> The Corner vacuum equipment is being pumped only via the YBM Turbo pump which is being backed by a leak detector and CP2.  IP1, IP2, IP5 and IP6 are valved-out.  This is a temporary pumping arrangement.  Also, the instrument air used to control CP2 is not enabled currently which is also a temporary state.