I have been running opportunistic noise budget injections:

• Pitch and yaw jitter injections on June 5
• MICH P and Y, DC6 P on June 18
• Frequency noise, CHARD P and Y, DHARD P and Y, PRC2 P and Y, and intensity noise on June 23

So far there seems to be no noise contribution from DC6 P and PRC2 P and Y. CHARD noise contributions are also down significantly with the ISI in place.

Lockloss at 2025-06-23 19:58 UTC. A commissioner was running a jitter noise injection at the time of the lockloss, but doesn't think that was the cause of the lockloss.

We took 20 minutes of no-squeezing data for a cross correlation measurement today. I ran a script to collect the full 524 kHz data from DCPD A and B. The data is currently saved in 1 second hdf5 frames in /ligo/home/elenna.capote/OMC_DCPD/252306-092558_xcorr_data

Mon Jun 23 10:11:08 2025 INFO: Fill completed in 11min 4secs

Lockloss at 2025-06-23 17:18 UTC during commissioning after nearly 14 hours of being Locked. Unknown cause

Elenna, Sheila, Kevin, Matt, Camilla

For some thermalization tests, at 17:05UTC we stepped CO2 powers down from 1.7W to 0.9W each into IFO. Expect majority of thermalization to take ~1hour.

Beforehand, Sheila plugged in the freq noise injection cables in the LVEA PSL racks and Elenna turned on the AWG_LINES guardian.

Last week 85000, NLG was measured to be 18.9, now it's measured to be <8. We will look into why is it low.

Ran SCAN_SQZANG_FDS before doing a CO2 step.

TITLE: 06/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 142Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.07 μm/s
QUICK SUMMARY:

Observing at 140Mpc and have been locked for just over 11 hours. We have commissioning today starting at 15:00UTC.

TITLE: 06/23 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: One lockloss this shift which took a while to come back from, but overall a fairly quiet evening. H1 has been locked for 1.5 hours.

• 00:59 - Lockloss - alog85232
• 03:33 - Low Noise
  • Convincing SQZ to work (see above alog)
• 03:45 - Observing

Lockloss @ 00:59 UTC after almost 23 hours locked - link to lockloss tool

No obvious cause.

TITLE: 06/22 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 15mph Gusts, 5mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY: H1 has been locked for 19.5 hours and all's quiet.

• Wind is low, microseism falling
• All other systems nominal

TITLE: 06/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

A nice very quiet shift!  H1 has been humming along (currently at 19.5hr lock), and no intervention was needed during the shift.  Breezes have increased slightly through the day.
LOG:  n/a

Sun Jun 22 10:09:56 2025 INFO: Fill completed in 9min 52secs

Measurement NOTES:

• Posted heads up reminder for the Sat Morning Calibration on the IGWN channel on Mattermost.
• Following instructions (link)
• H1 at NLN for for almost 2hrs55min (over 3hrs at 60W).
• Calibration_Monitor medm screenshot is attached
• 1830-1859 utc Out of Observing for CALIBRATION
•  Broadband measurement started at 1434565843.086414 (18:30:25utc)
  • Measurement at:  /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20250621T183025Z.xml
•  Simullines measurement
  • gps START time:  1434566163.985407 (18:35:45utc)
  • gps STOP time: 1434567563.816039 (18:59:95utc)
  •  File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20250621T183546Z.hdf5
  • File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20250621T183546Z.hdf5
  • File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20250621T183546Z.hdf5
  • File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20250621T183546Z.hdf5
  • File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/
• 1859 ISC_LOCK taken back to NLN for observing

Attached is a screenshot of the Calibration Monitor + pdf of Pydarm Report

Oli, Elenna

Oli and I combed through some of the recent locklosses by hand, and noticed that there are at least two that have a 13 Hz oscillation in the LSC channels just before the lockloss.

1434317297

1434276630

This is reminiscent to us of PRCL losing gain due to thermalization which has caused 11 Hz ring ups before. We should keep an eye out. Note that one of the above locklosses has the "earthquake" tag, but it's very clear that the ring up caused the lockloss.

Oli and I went back about 1 week and checked the NLN locklosses by eye and only found these two so far.

To start, we can periodically check PRCL OLG or other LSC OLGs during thermalization to make sure we aren't losing significant optical gain. Or we can inject a line during commissioning.

At 16:14:31 PDT h1daqdc0 crashed. Its EPICS IOC stopped running resulting in white boxes on MEDM. Last log was 15:56.

I connected a monitor to its VGA port, its console was showing the login prompt. The cursor was not flashing and an attached keyboard was unresponsive.

Erik and I rebooted the machine by pressing the front panel RESET button. It booted and started with no problems.

Currently we don't know why dc0 froze this way.