18:23 UTC lockloss alog85433

Mon Jun 30 10:12:57 2025 INFO: Fill completed in 12min 53secs

M. Todd, R. Crouch, E. Capote, S. Dwyer

After 5 minutes or so from stepping the CO2 lasers from 1.7W to 0.9W, we began to see the 13Hz ring-up again before losing lock.

We believe this to be PRCL losing gain because of the change in the CO2s. I'm also wondering if the CO2s may be miscentered and causing some roll modes via differential heating of the fibers -- the frequenices do not exactly match up I think but need to check on this.

15:40 UTC lockloss while we were running the CO2 stepper. alog85429

I ran the DARM offset stepping script using Jennie Wright's instructions from 85136.

Writing data to
/ligo/gitcommon/labutils/darm_offset_step/data/darm_offset_steps_2025_Jun_30_15_06_50_UTC.txt

TITLE: 06/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 4mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.07 μm/s
QUICK SUMMARY:

• We've been locked for just udner 19 hours
  • SQZing doesn't look the best, particularly at high frequency
• Low wind, secondary microseism is starting to creep up a little
• PI24 rang up 6 times overnight, but was damped
• Commissioning is planned from 15:00 - 19:00 UTC today

FRS34130

Upgrading Pylon on h1digivideo[4,5,6] has fixed the problem whereby camera processes continued to open files until they eventually reached the OS num_files limit and the camera crashed (new files were opened each time connection to the camera was restored, old files were not cleaned up).

Since the upgrade Tuesday 24 June 2025 the number of files open per process has remained static. Details in FRS, this ticket has been closed.

TITLE: 06/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

IFO is in NLN and OBSERVING since 19:42 UTC (9 hr lock!)

An extremely calm shift in which the circumstancial lock-killing culprits of the world evidently and collectively decided to take a nap. In other words, there have been no earthquakes, the secondary microseism is as low as can be, wind is under 10mph, no SQZ locklosses, no ETM LLs.

The only thing worth commenting on is that the SQZ angle is probably not ideal but according to past instructions from Sheila, we shouldn't go to comissioning if there are other IFOs observing. Since this was the case the entire shift, I did not drop out to try and optimize SQZ so this will have to wait till tomorrow/another lock.

LOG:

None

Link to DQ Shift Summary

• The duty cycle for this week was 54.9%
• h(t) spectrograms were showing continuous high amplitude noise around 140Hz for all the days. 
• Seismic, wind and ground motion remained relatively low with some occasional exceptions being here and there, which cause noise in the PEMs. 
• Glitchgram showed large amount of high SNR glitches for some days with increase in glitch rate. 
• Corner BSC2 [Y[ chamber experience very high amplitude noise at below 10 hz continuously for all days. 
• FScan plots were available except for Sunday, June 29 with the line count remaining at around 2400 well below the threshold.

TITLE: 06/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 12mph Gusts, 5mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING since 19:42 UTC (3.5 hr lock)

Ryan C reports a very calm shift with the only comment that he had to run 2x initial alignments. I had to do this also a few days ago despite good DRMI flashes.

TITLE: 06/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: One lockloss, I had to run 2 alignments to get DRMI to lock.
LOG: No log.

• 16:25 UTC PI24 rang up but was successfully damped back down.
• 16:38 UTC lockloss
  • 17:16 UTC I ran an alignment after not being able to get PRMI
  • Still couldn't lock DRMI or PRMI despite having good flashes around 100
  • 18:32 UTC trying another alignment
  • DRMI locked quickly now, I also adjusted the OPO temp while relocking
  • 19:42 UTC Observing

Sun Jun 29 10:13:36 2025 INFO: Fill completed in 13min 32secs

16:38 UTC lockloss

TITLE: 06/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 2mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.06 μm/s
QUICK SUMMARY:

• We've been locked for just under 14hours!
  • 2 superevents overnight
• Low wind, low microseism
• The range has dipped a little bit over the past ~3 hours, seems SQZ related

TITLE: 06/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 00:40 UTC (4 hr lock)

A very calm shift in which we were able to lock fully automatically following an ETM Glitch Lockloss at the beginning of the shift (alog 85413). Otherwise, our range has remained mostly steady.

We also surtvived a 4.6 EQ from Northern California (and 2 of its similar aftershocks),.

LOG:

None

TITLE: 06/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Two locklosses, mostly automated relock on the first one. We are relocking at DRMI currently.
LOG: No log.

• 13:25 UTC lockloss
  • 15:53 UTC Observing
  • 18:23 UTC Superevent S250628am
  • 19:00 - 19:31 UTC dropped observing to run a calibration measurement
• 20:43 UTC lockloss
  • 22:05 UTC observing
• 23:18 UTC lockloss

23:18 UTC lockloss

TITLE: 06/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 20mph Gusts, 8mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.06 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 22:05 UTC

IFO recovered from an ETM glitch lockloss an hour ago.