Jason, Filiberto, Fernando.

Per the WP11763

Motor/Brake cable identification was perfromed for the TIMX/ITMY/BS OPLevers. The provisional Medm was tested as well. We took advantage of this opportunity to complete the internal wiring in the BS OPLEver with the inclusion of the RJ9 patches.

The WP will remain open to perform the activity in ETMX/ETMY next Tuesday. 

WP11743 SUS DACKILL removal

Jeff, Oli, Dave:

SUS model modifications to remove DACKILL parts and install new WD systems was made to the corner station BSCs (ITMX, ITMY, BS).

New models were installed for h1susitmx, h1susitmy, h1susbs, h1susitmpi, h1isiitmx, h1isiitmy, h1isibs. DAQ restart was required.

DAQ Restart

Dave:

DAQ was restarted for model changes, no EDC restart. 0-leg restart 10:52, 1-leg restart 10:57. Both required GDS second restarts for channel list sync. No issues.

CDS SDF WAP back to O4 configuration

Oli, Dave:

The CDS WiFi WAPs are back to their O4 configuration (all OFF except MSR). I have accepted the SDF diffs.

(Betsy, Camilla)

We performed an LVEA closeout walk thru after today's Tues Maint window (and the previous weeks of vent and pump work).

Nutsinee helped tidy up the Squeezer rack power cords and auxilliary equipment which was plugged in and around the floor.  There is still a spectrum analyzer plugged in and powered up at the rack since there will be some more work there throughout the Eng Run starting tomorrow.

All HEPIs, cleanrooms, and ISC tables in proper shape.  Camilla unplugged the high lift which was still on a charger.

The high bay door to the CER on the way into the LVEA is still open, had been open during O4a legacy of some old HVAC issue.  However, Fil reports that the HVAC issue should be solved so we have closed the door now (to aid in any further electronic noise near the inner LVEA walls).

Paging system and phones all unplugged.

Oli turned off the WIFI hubs remotely.

Staff out, lights in the LVEA are off.

RickS, Daiki Tanabe, Francisco Llamas

This morning we moved the Xend pcal beams to center them on the input aperture target of the pcal Rx power sensor. This is the initial configuration for a series of pcal beam position movements to test the X/Y comparison ratio. Notes for reference attached as pdf.

09:00 local: Turned off the ALS green laser.

The outer beam was initially off-center, a bit below the target. The inner beam seemed to be centered. See first image (PXL_20240319_162539223) attached. We used the Rx power sensor, H1:CAL-PCALX_RX_PD_WATTS_OUTMON, to maximize the input power from each beam, one at a time. The first beam we maximized was the inner beam, going from 0.211 W to 0.223 W. Next, we maximized the outer beam. We unintentionally moved the outer beam to the lower target, 5 mm below center and found a maximum at 0.209 W. The total power with the target on was 0.432. This "accident" happened because no one was supervising the direction the beam was moving on the Rx input port while the mirror was being moved. The maximum value of the outer beam centered on the target was found at 0.209 W. The total power with the target on was 0.432. Our "accident" leans towards laser power measurement being independent of beam location, within a tenth of a percent. The power, once the target was removed, was 0.491 W. See second attached image (PXL_20240319_170413484) for the beam location after we finished our configuration.

10:20 local: Turned on the ALS green laser.

The connection of the X-manifold purge line to the main purge tubing system in the LVEA was finished today:

- A 20' long tube was re-used from the H2 system leftover tubes after it was proven to be clean, to lengthen the X-manifold purge line
- In the Y-manifold line, a tee was moved closer to the X-manifold, which was used for the connection
- A U-shaped H2 leftover tubing was reused as a connection element over the other tubings and conduits
- 2 more corner pieces, a straight tube, and a bellows were purchased to complete the connection

This work still needed to be done after the decommissioning of the H2 system, as without this, the X-manifold could not be purged. This line is also essential for the regeneration of CP2 in the future.

It was nice work from the vacuum team, the whole thing was done within 2 maintenance periods.

WP 11772

Repaired unit was reinstalled in the CER Rack SEI-C4 slot U40. Unit first reported with issues in alog 76466. Unit removed for repairs, alog 76467.

BSC ISI Interface Chassis (D1002432) SN S1201320

Tue Mar 19 10:10:49 2024 INFO: Fill completed in 10min 45secs

TITLE: 03/19 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.19 μm/s
QUICK SUMMARY:

Maintenance today! Looks like we were up for a good number of hours overnight.

Workstations were updated and rebooted.  Os packages were updated.  Conda package 'gwinc' was updated to 0.6.0.

TITLE: 03/18 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: None
SHIFT SUMMARY:

Shift started with Squeezer work with H1 in NLN.

Then there was work on PSAMs differential adjustments.  Then there was work on PR3 alignment 

For locking, we definitely appear to need to run Initial Alignment after locklosses.  
And LOWNOISE ASC was stuck in a loop for about 20-30min before I noticed it.  (see below)
LOG:

• 0205-0215 Measurement at SQZ rack (nutinsee)
• 0452 Lockloss due to PR3 work.  ETMx ISI tripped, but that was NOT related to PR3 work (evan)
• Lock Attempt #1:  Y-arm took several INCREASE FLASHES.
  • Had to run CHECK MICH FRINGES + PRMI & then DRMI locked, but would have a "DRMI Unlocked" at ENGAGE DRMI ASC (twice) or at TURN ON BS STAGE2 (once).
  • Opted to go for Initial Alignment---this was something Ibrahim suggested to me at the beginning of the shift, but I wanted to see if H1 could get past DRMI.
  • Attempting to lock instead of going immediately into an Initial Alignment took about 45min. :-/ 
• 0532-0555 (23min) Alignment notes:
  • for PRC ALIGN---PRC1_Y_out16 was notably off (~7000counts) more than others (PRC1_P_out16 & PRC1_[P,Y]_inmon) which were only at 600 counts.
• Lock #2:  Made it through DRMI w/ no problem (POP90 was lower for this lock than the (3) DRMI locks I had for Lock#1.)
  • Noticed ISCLOCK was stuck in a loop for LOWNOISE ASC:
    •       elif self.counter==9 and self.timer['LoopShapeRamp']:
                  ezca['ASC-AS_A_DC_YAW_OFFSET'] = -0.15
                  ezca.switch('ASC-AS_A_DC_YAW', 'OFFSET', 'ON')
                  self.timer['LoopShapeRamp'] = 10
• Leaving with H1 at the NLN state, but it appears to not be squeezing.  And we are waiting for VIOLIN DAMPING to kick in.
• Louis is setting up his measurement to run in 3hrs if H1 is locked.

Naoki, Camilla, Evan, Sheila, Julian, Nutsinee

Many things happened with the squeezer this afternoon. A quick summary is we are back to 5 dB at kHz and we should be able to do this repeatedly. No PSAMs adjustment required at this time.

- When the IFO relocked this afternoon we adjusted ZM5 alignment to optimize ADF trans signal. By doing so we improved both the RF3 and the 42. However this made squeezing worse.

- We adjusted the SQZ angle. We couldn't make it better so we went the other way. This made squeezing worse and ADS TRANS went up with it. Note that this is the IQSUM channel. We didn't think that was a sensible behavior but we've seen it before.

- Sheila and Julian then optimized the crystal tempeature. The NLG for today was 17.3.

- Naoki measured the SQZ IFO sensing matrix. We found a big cross coupling between ZM5 P to AS42 B Y. Other than then everything else was sensible. A new improved sensing matrix has been implemented. 

- We lost hours tracking down why the filter cavity failed to lock on green. A reminder to check SDF next time we run into mysterious problems.

- After everything went back to normal we recovered 5 dB of squeezing. DARM plot said so. BLRMS seemed slightly off. We tried turning the ASC loop off and optimizing the ZM alignment by hand to see if we could do any better than the loop. We couldn't. SQZ IFO ASC loop now works as it should.

- We also optimized the filter cavity offset. Mostly to double checked that we were sitting at a good place. An offset of -28 (where we started) gave the best squeezing at low frequency.

We haven't got to increase CLF power today. 

After a new CLF VCO installed we should revert the CLF sign to make sure everything was the same as before. In theory this shouldn't do anything. 

Jennie, Naoki, Evan, Gabriele

WE stepped the two PSAMS differentially, to find a better position. There is some evidence that a value of 150 / 90 is better than the original 120 / 120. Noise i a 200-250 Hz region is about 4% lower. More details will follow.

We tried a small common step after the differential tuning, but saw little effect

Jennie, Naoki, Evan, Gabriele

We changed the SRCL offset between -250 and 0 counts, and optimizd the squeezing angle at each value. We see an effect at high frequency (worsening when the offset is different than the nominal -175) but not noticeable change in the bucket.

Evan, Naoki, Nutsinee, Camilla

Today Sheila added nodes.set_managed() in INIT state of SQZ_FC guardian and let SQZ_FC guardian go through the INIT state. However, the FC2 M1 offload filter in the INIT state was old filter setting in 68914, which caused GR_SUS_LOCKING failure. We reverted it as shown in the attachment and updated the FC2 M1 offload filter in INIT state.

Updated ASC-AS_A_DC_YAW_OFFSET to be -0.15 instead of OFF at 00:09:36 UTC as even though this change has now been put in the guardian we have not lost lock since this was done by Sheila and so the offset was still off. I checked with the squeezers first.

I edited ISC_LOCK LOWNOISE_ASC state to engage the -0.15 offset in AS_A_YAW_DC that was found 76407, I have just loaded it now so it should happen the next time we lock the IFO.

I tested again the OMC aligment with low frequency lines, as in 76335

It looks like there is still some modulation of the DARM line amplitude at 410.x Hz. There is also some effect on the pitch jitter line amplitude, but no effect on the yaw jitter line amplitude.

New offsets that simultaneously make the DARM calibration line maximum and the pitch jitter minimum:

I put those offsets in. The range dropped. So they are not good. I don't understand why. I reverted them. The range went back. A step in the other directions did not change the range much, but KAPPAC dropped.