Andrei, Naoki, Sheila

Following the aLOG 78726, we've calculated the Optical Gain [counts/μm] from FC_IR_OLTF following steps in Diagram. This transfer function will be used to calibrate the FC mirror movement from its Error signal for later use in RIN estimation and backscattering measurements. Inferred Optical Gain plot can be found here: inferred_OG_with_fit.png. Cavity pole frequency is estimated as 34 Hz.

A reminder that the current EX Timing System error is expected due to a mismatch in the timing card firmware version for h1susex's timing card. To verify that this is the only timing error at EX, I have added a check in the CDS STAT system. It will report an error is an additional timing error occurs.

I have annoted the timing system top level MEDM with this information, and included a related display button to open the CDS STAT MEDM (see attached).

When the timing system is updated to expect the new firmware version and remove the EX error, I will remove these temporary measures.

The exhaust fans that serve the LEXC bathrooms were not commanding on. We searched for any sign of power local to the fan and none could be found. All circuits that serve the fan were not tripped. At this time we have manually forced them on at the FMCS. We suspect the failed AHU in LEXC zone 2 sets the occupancy schedule for these fans. The fans will continue to be operated manually until PHP-02 (dead Daiken) is repaired.

B. Gateley E. Otterman T. Guidry 

MX, EX, MY all received approximately 130 gallons of glycol between the 3. Line pressures were set to their desired levels.

T. Guidry E. Otterman C. Soike

Sheila, Tony, Jenne, Camilla. Details in 78828.

At 14:44 UTC h1sush2b suffered a timing error and had to be restarted. 

The timing error happened when work was being done in the same rack in the CER, see https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78823.

The timing error was a "long cycle" of 50 milliseconds.

Started well pump to top off fire water tank. Pump will run for 4 hrs and auto off.

TITLE: 07/03 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 16mph Gusts, 12mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:
DIAG_MAIN says : CONNECTION ERRORS, See SPM DIFFS for dead channels.
CDS_OVERVIEW shows:
H1OPSUSHA is clearly having a hardtime as described in Oli's alog: 78823 . Erik is saying that this is a bad 18 bit DAC.C

Erik, Oli

Got a call from IFO_NOTIFY - there was ground motion that caused the HAM2 ISI (11:56:26 UTC), SEI SW (11:56:28 UTC), and Hepi (11:56:31 UTC) watchdogs to trip. Along with/causing this (or by coincidence?) is an error with H1IOPSUSH2A, and the GDS screen was showing 'LTDS' in red. The front end needs to be either power-cycled, or possibly a card replaced, so Erik will be heading into site in a bit to see about fixing the errors. I manualed ISC_LOCK into IDLE, and either me or the DAY operator will get the ifo back up once the CDS issue is resolved.

TITLE: 07/03 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Spent most of the shift down from the high winds. Currently relocking at DHARD_WFS

Lock 1: Alignments and PRC1 bypass

• 00:46 UTC NORCO came through the gates
• After the IA finished I held us in down and ran the PSL rotation stage calibration following RyanS instructions/alog. Relocking afterwords we did 1 round of PRMI after we initially couldn't get DRMI but we lost lock at the same point in the code (ISC_DRMI) 3 times in a row right after PRC1 went on. Jenne got us past this by taking the loop out alog78818
• 01:46 UTC back to NLN, where I had to accept some SDF diffs, PSL diffs
• 01:50 UTC Observing
• 02:53 UTC lockloss

Lock2: Windy, 42mph Gusts, 33mph 5min avg

• Spent a while in Environment (Wind) ops mode
• 06:40 I noticed the wind looked to be dropping (20mph gusts, ~10mph 5min avg) so I started trying again, ALS is doing better now but not much luck on DRMI/PRMI
• 07:25 started an IA after 2 rounds of CHECK_MICH didn't give anything on PRMI, finished at 07:46 UTC

General:

• MC2, PR2, PRM cameras are blue from Roberts viewport work
• DIAG_MAIN messages
  • EXT-ALERT: stand down query failure, it seems related to the leap second issue alog78724, it's run on cdsioc0 (Tagging CDS). I tried restarting the process which didn't fix it
    • "RuntimeError: Error loading leap file: https://www.ietf.org/timezone>"
  • PSL_FSS_TPD refcav transmission is low (PSL)
  • ISCTEX fiber beam shutter is open, since around 07/02/24 22:30 UTC

LOG:                                                                                                                                  

I did some trending of the some LSC and ASC signals during the 3 DRMI locklosses from earlier. Here we have the 1st, 2nd, and 3rd lockloss and an example of a good lock from the last long lock before maintenance. I can see that the LSC INMON signals looked maybe twice as strong now compared to before. ASC_PRC1_YAW looks especially different than it did last night, ASC_PRC1_PIT_OUTMON seems to have changed sign to negative from positive. The PRM OSEMS don't look particularly different, a good lock from yesterday, DRMI LL from today.

https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1404010437

The wind has picked up a decent amount since the last lock aquisition so ALS will most likely have trouble staying locked. Gust are  >= 40 mph

[Jenne, Sheila, Tony]

The PMC swap work earlier today (alog 78813) resulted in a slight shift of the alignment of the beams coming out of the PMC. 

After Ryan and Jason finished getting the ref cav aligned and locked, the IMC alignment looked poor.  I was able to mostly get it back by hand-moving the sliders for the PZT at the PSL periscope.  I touched MC2 a tiny bit, and then the IMC was able to lock.  I lowered the IMC WFS thresholds (eg  H1:IMC-IMC_TRIGGER_THRESH_ON and _OFF) so that it would take over alignment.  Once the alignment was pretty nearly finished, I used the IMC_LOCK guardian to offload the IMC WFS.  I saved in the safe.snap file for IMCASC the PZT offsets that had been offloaded.

In parallel, Sheila worked on the ALS system.  The initial goal was to check and adjust the PSL pickoff portion of the COMM beatnote, however Sheila noted that the ALS Xarm couldn't lock, since the end station PLLs weren't getting enough light from the PSL.  Sheila lowered the threshold of H1:ALS-C_FIBR_INTERNAL_DC_LOW from 0.05mW to 0.02mW, and also lowered H1:ALS-X_FIBR_LOCK_FIBER_LAUNCHLIM from 0.3 to 0.2 .  After this, the ALS Xarm was able to lock, and Sheila went out to ISCT1 and got the COMM beatnote up to about -1 dBm.  We then convinced ALS Yarm to lock after lowering H1:ALS-Y_FIBR_LOCK_FIBER_LAUNCHLIM from 0.3 to 0.2.  Sheila also changed H1:SQZ-FIBR_TRANS_DC_LOW from 0.2 to 0.05 mW and H1:SQZ-FIBR_LOCK_FIBER_LAUNCHLIM from 0.3 to 0.15, after which she was able to get the squeezer all locked up, so it seems like the squeezer should work fine when we get to that point this evening. 

Attached is the SDF screenshot that Sheila took for the squeezer thresholds.  The other ALS thresholds were also accepted in their safe.snap files.  All of these will need to be accepted in the Observe.snap SDFs in order for us to get to Observing. 

I helped the initial alignment a bit, by moving IM4 and PR2 a bit for the Input_align, and then moving PRM for PRC_align.  After that, initial alignment seemed to finish on its own. 

Particularly since we have been having ALS beatnote issues lately (see alog 78806 for some notes), we will almost certainly want to go into the PSL tomorrow to tweak the alignment of the optic that directs the beam to the fiber for the fiber distribution box, so that we can undo all these threshold changes.  Jason makes the good point that the longest part of doing that tweak will be garbing up for going into the PSL, so it should be quite easy.