I did some quick reconciliation of some of the observe SDF diffs. An easy one was all dark offsets. I also accepted many of the ASC SDFs, since I am responsible for many of them. This includes things like PD phasing, new intrix values, gain changes, etc. I also accepted several LSC SDFs, which also includes PD phasing, matrix changes, feedforward changes, and the MICH filter change. The only one I am not familiar with in the attached screenshot is the MCL trig threshhold.

Headline summary: We are very nearly back to NLN, only prevented in returning by the violin modes which are too high to engage OMC whitening. We have not yet been able to calibrate because of a very fast lockloss of unknown source.

The alog was down for most of the afternoon and evening, so I will do my best here to copy mesages from the mattermost chat, which served as the temporary alog.

Minor struggles in returning to full lock:

• The first lock, we did have to by-hand reduce the CARM offset to go to CARM_TO_REFL successfully.
• We reset the green references after ASC converged.
• The next lock (after setting green references and doing an initial alignment) this worked automatically, so no changes were made to guardian.
• MICH P rang up one lockloss, so I reverted the MICH ASC control to an older high bandwidth design. We will need to check the impact on the noise later

Once we achieved full power, we proceeded to try to solve some of the final instabilities leftover from last week. Changes made to avoid locking stability problems:

• New order of states. We now run: Max Power > Low Noise Coil Drivers > Transition from ETMX > Low noise ESD ETMX > Low Noise ASC > Low noise Length Control
  • we got a lot of saturation warnings because of the amplitude of the ADS lines in coil drivers, so the guardian now turns OFF the lines completely, and then turns them back on in lownoise ESD
  • I didn't change state numbers, but I changed the order, and some of the weights to ensure this is the path taken
  • this was tested successfully
• We no longer engage the DHARD P boost in FM8. This may have some effect on the noise which must be checked later
• We tested laser noise suppression; there are no problems
• While in OMC whitening, I ran a quick DARM OLG with Fransisco. There is slightly less phase, but overall it looks fine, at least compared to the reference. However, we don't have a lot of phase margin in general, should we fix that?

The plan was to try testing simulines again, however! We have had multiple very fast locklosses with no known origin. Two have happened shortly after arriving at OMC whitening. These are not coming from ASC and I don't see any ringup in DARM or LSC loops.

TITLE: 06/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 18mph Gusts, 9mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.17 μm/s
SHIFT SUMMARY:

Covering for Ryan C.
OFI Returned to aligned... No output. Apparently this is normal.

SRM already aligned by Elenna.
Attempting to start relocking 19:00 UTC
Potential Lockloss from FIND_IR when I requested SEI_ENV to cycle between Maintenance & CALM.

Lots of saturations when we ran through LOWNOISE_COIL_DRIVERS

Unknown Lockloss from Low_Noise ASC ( We manualed over a handful of States and Ended up manualing back to this state.)

Adjusted the ALS polarization of both X and Y arms.
Ran a Manual_Initial_Alignment Finished @ 22:26 UTC

No internet do to a GC switch restart 22:40 UTC. Internet back up a few moments later.


Lots of saturations when we ran through LOWNOISE_COIL_DRIVERS again, we did not lose lock either time.

Lockloss due to DHARD P ring up while in LOW_NOISE_LENGTH_CONTROL.

LOG:

TITLE: 06/09 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 7mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

Locking work continues with H1 getting past 60W and commissioners focusing on ASC steps around LOWNOISE states (most recent lockloss was a DHARD pitch ring up. 

As for locking, it looks like H1 is locking decently, but Tony did say he ran a recent Manual Alignment.  Alignment-wise we are still running manually with PRC step only being partly run---basically take to PRX and touch up ASC-AS_A by hand via PRM (this is what we have been doing the last few weeks).

Plans are to take H1 to MAX POWER and continue ASC work.

Oh and for the forecast tonmight, we have a warning of high winds!  (We are also very hot---just under 105degF now).

I copied the contents of C:\SlowControls on h1brsex and h1brsey onto a usb stick. I committed changes local to h1brsex into svn. I ran svn update on h1brsey. I was just expecting the changes I committed from h1brsex to show up, but a whole lot more did. I guess no one had run svn update in a long time. It appeared to complete without conflicts and reported that it was now at revision 6189. I started committing files to svn on h1brsey that I thought did not conflict between the two machines, but I think I accidentally committed one that does. I committed local changes on h1brsey to /trunk/BRS2 C#/BRSReadout/configs/LHOEY.config, but afterward found that there are also local changes to the same file on h1brsex.

Ibrahim, Rahul

Rahul and I installed the BBSS Vibration Absorbers. We then took more B&K measurements and Rahul is analyzing them. Pictures attached.

Weekly TCS Chiller Water Level Top-Off FAMIS 27815

TCSX - 30.5 No water added
TSCY - 10.5 no water added

Reported in https://dcc.ligo.org/T2200289 .

Green Refs reset now that we had all of the 2W ASC on and converged.  SDFs saved in the safe.snap

Patrick Thomas, Jonathan Hanks, David Barker,

As a followup to WP 12574 we did the software setup for the ISCT1 REFL camera.  This is replacing the analog camera with a digital IP camera.  It is now h1cam37.

The only problem we had, was when assigning dhcp addresses we had already seen this camera and assigned it to msr-test-cam... So after removing the msr-test-cam entries from DNS and DHCP the camera came up as h1cam37 and started working.

I've attached a screen shot that Patrick took which shows where it is on the camera overview plus a sample of the data.

Mon Jun 09 10:09:58 2025 INFO: Fill completed in 9min 55secs

Travis confirmed a good fill curbside.

FAMIS 31089

PMC REFL and RefCav TPD both had a bit of a drop-off over the past 3-4 days, but PMC TRANS is largely unchanged. We've seen correlation before with changing outdoor temperatures and RefCav alignment, so I suppose it's possible the recent heat wave is having an effect on the PMC as well.

The PID controller for EY CP7 cryopump has opened its liquid level control valve (LLCV) to 100% but this is proving to be insufficient to maintain a 92% fill level in the pump. The pump level started deviating from nominal around 4pm Friday 06jun2025 PDT.

Vacuum team is investigating.

Note: no alarms issued at this point, the cyropump alarm level is < 80%, CP7 currently is at 85%.

TJ, Camilla WP 12605, WP 12593

As HAM1 is now low enough in pressure, we removed the HAM1 +Y yellow VP covers, re-attached bellows and removed guillotines. ISCT1 was moved back into place on Friday 84850.

After TJ transitioned to Laser Hazard, we opened the ALS and PSL light pipes and turned back on the SQZ, CO2s and HWSs lasers.  

After okay from VAC, IMC locked without issue, PRC and MICH alignments look good enough on AS AIR camera and we will begin realigning ISCT1 soon.

TITLE: 06/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.12 μm/s
QUICK SUMMARY:

• HAM1 pressure is at 2.64e-06
• ISCT1 table realignment today

Fil, Keita, Daniel, Camilla  WP12598 WP12584

We swapped the old REFL Analog Camera to a Gige Digital Camera (Basler acA720-290g m S/N 40477593) on ISCT1 and cabled to the table feedthrough. There was no beams today so the alignment may need to be touched up.

Keita and Daniel also removed the MCL steering mirror, controller and the in-air POP-X WFS (S1300511, now stored in the EE shop) with mirror and lens from ISCT1. MLC controller and PZT will be stored in mid station storage. The beamsplitter towards the old POP-X path stayed but was blocked with the beam dump that used to be dumping the POP-X reflection.

Table layout D1201103 not yet updated. Photo of table attached. 

Randy, TJ, Fil, Richard, Camilla, WPs: 12593, 12594

After Fil and Richard un-cabled ISCT1, TJ and I added guillotines to HAM1 +Y VPs, removed bellows and attached yellow VP covers. Randy then fork-lifted ISCT1 away from HAM1 and placed it next to IOT2L.

• ITMX: Superluminescent Diode QSDM-790-5 
  • S/N 06.18.001 - removed alog#61892 - will disposition*
  • S/N 06.18.002 - removed with 0.8mW alog#66179 - will keep as used spare. 
  • S/N 07.14.254 - removed alog#44201 - will disposition*
  • S/N 07.14.256 - removed alog#41411  - will disposition*
• ITMY: Superluminescent Diode QSDM-840-5
  • S/N 03.20.479 - new in sealed box
  • S/N 06.16.005 - new in sealed box
  • S/N 11.17.126 - removed with 0.19mW alog#66179  - will disposition*

* Added to ICS DEFECT-TCS-7753, will give to Chrisitna for dispositioning once new stock has arrived.