Reports until 07:43, Tuesday 26 August 2025
H1 General
anthony.sanchez@LIGO.ORG - posted 07:43, Tuesday 26 August 2025 - last comment - 13:12, Tuesday 26 August 2025(86565)
Tuesday Ops Maintenance Day

TITLE: 08/26 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 15mph Gusts, 9mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY:
H1 has been locked for 10+ hours.

Today At 14:21 UTC it appears the Magnetic Injections started.
At 14:40 UTC Back to Observing.
Down to Commissioning again at 14:45 UTC



Expected Tuesday Maintenance Work:
VAC - MX and MY pump install work continuing (booster pumps will be connected)
VAC - BSC1 AIP troubleshooting. Needs LASER SAFE condition.  Postponed
VAC - LN2 delivery: MX (CP5) and MY (CP3)
VAC - FC guage work (pumping)
Randy - North Bay - cleaning of top of eMod
Randy - East Bay - remove C3 cleanroom sock cover over HAM5 & 6
FAC - rock delivery at Staging building
CDS -Daniel - Change the whitening chassis that is currently used for the ASC-AS_C QPD
Fil - HAM5&6 racks - install of BHD stuff
LN2 - MY & MX
Charge meas't ?

 

 

Comments related to this report
anthony.sanchez@LIGO.ORG - 12:29, Tuesday 26 August 2025 (86576)
Link

SNEWS Test @ 16:59 UTC 
Vaccum Mid X Pressure alarm Low 17:53 UTC.
12 Hours ago there was an increase in CER Temps

Expected Tuesday Maintenance Work:
Done - VAC - MX and MY pump install work continuing (booster pumps will be connected)
Postponed ------ VAC - BSC1 AIP troubleshooting. Needs LASER SAFE condition. 
Done - VAC - LN2 delivery: MX (CP5) and MY (CP3)
"Done ....For Now...." ~ Gerardo - VAC - FC guage work (pumping)
Done North Bay - cleaning of top of eMod
Done  East Bay - remove C3 cleanroom sock cover over HAM5 & 6
Done -  FAC - rock delivery at Staging building 
Done - CDS -Daniel - Change the whitening chassis that is currently used for the ASC-AS_C QPD
Done - Fil - HAM5&6 racks - install of BHD stuff
Done - LN2 - MY & MX
Done - SUS Charge meas't ?
Done - Beaver Bark gravel dumps 
Done - Dust Mon Pump Swap
 

CER temps are now dropping

camilla.compton@LIGO.ORG - 13:12, Tuesday 26 August 2025 (86577)OpsInfo, SQZ
Link

Elenna noticed that we dropped from Observing 8 times last night, for around 2 minutes each time, plot. This was mainly due to the OPO loosing lock, reporting "2025-08-26_08:04:01.503798Z SQZ_OPO_LR [LOCKED_CLF_DUAL.run] USERMSG 0: OPO not really locked or maybe locked in a wrong mode" and taking itself to DOWN. I don't see a clear reason why, plot attached.

The OPO PZT was around 100V but we can operate up to 110V and the OPO ISS AOM was at it's central value of 5V. 

There is some OPO TRANS glitches where the power drops by more than 20% but the OPO stays locked, plot attached.

  • 7:10UTC OPO lost lock
  • 7:14UTC OPO lost lock
  • 7:18UTC FC lost lock
  • 8:03UTC OPO lost lock
  • 9:05UTC FC lost lock
  • 10:06UTC ISS LL counter.
    • Message "2025-08-26_10:06:12.261378Z SQZ_OPO_LR [LOCKED_CLF_DUAL.run] USERMSG 0: Disabling pump iss after 10 lockloss counter. Going to through LOCKED_CLF_DUAL_NO_ISS to turn on again."
    • The OPO ISS turned off, we see no reason why, it was at 5V, the middle of it's range, see attached plot.
  • 10:07UTC OPO lost lock
  • 10:15UTC OPO lost lock

Tagging OpsInfo, please check for drops in Observing overnight using the verbal alarms computer and tag the relevant team in your alog it it's obvious what caused the observing drop. For SQZ, there is a ndscope under sitemap > SQZ > SQZ Overview > ! SQZ Scopes > SQZ Guardians that compares the H1:GRD-IFO_OK channels to all SQZ Guardian to see if they were the reason for the observing drop.

Images attached to this comment