david.barker@LIGO.ORG - posted 10:22, Monday 23 June 2025 (85240)
Mon CP1 Fill
Mon Jun 23 10:11:08 2025 INFO: Fill completed in 11min 4secs
Images attached to this report
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
Looks like it was due to a 13Hz ringup in the LSC channels (ndscope). Elenna and I had found a couple other recent locklosses that also had ringups at 13Hz in 85167
I took the opportunity to update h1hpiham1's safe.snap to the latest channel list, removing 47 not-found chans as part of Jim's model cleanup.
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.
I'm adding a detchar tag here in case anyone is wondering where all the lines are coming from in the data around this time- these are purposefully injected lines. If AWG_LINES is injecting, it will be in state 10. When IDLE (no injections), it is in state 2.
After Kevin did some 10kHz SQZ ADF scans, we look some SQZ FIS data. The best ASQZ and SQZ didn't look as good as usual, but we found our NLG was low. We didn't check the NLG first so that we had a direct comparison to Kevin's dataset.
Roughly following 83594 with slightly different data taken.
DTT saved as camilla.compton/Documents/sqz/templates/dtt/20250623_FIS.xml and screenshot attached.
| Type | Time (UTC) | Angle | DTT Ref |
| FIS Mean SQZ | 15:53:00 - 15:56:00 | N/A | ref 1 |
| FIS + Mid SQZ (aimed +7dB @1kHz) | 15:58:30 - 16:01:30 | (-) 242 | ref 2 |
| FIS - Mid SQZ (aimed +7dB @1kHz) | 16:03:00 - 16:06:00 | (-) 94 | ref 3 |
| FIS ASQZ | 16:08:30 - 16:11:30 | (-) 63 | ref 4 |
| FIS SQZ | 16:13:30 -16:16:30 | (-) 122 | ref 5 |
| No SQZ | 16:26:00 - 16:46:00 | N/A | ref 0 |
| OPO Setpoint | Amplified Max | Amplified Min | UnAmp | Dark | NLG | OPO Gain | Note |
| 95uW | 0.001504 | 6.71 e-5 | 0.0002828 | -2.52e-5 | 4.9 | -8 | Without changing OPO temp |
| 95uW | 0.002317 | 8.69e-5 | 0.0002828 | -2.52e-5 | 7.5 | -8 | With changing OPO temp |
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.
I measured the NLG with a few different opo pump powers to follow up on Camilla's observation that the NLG was low.
| OPO trans power [uW] | maximum | minimum | nlg |
| 95 | 2.26e-3 | 8.195e-5 | 8.5 |
| 80 | 2.25e-3 | 8.795e-5 | 8.2 |
| 60 | 1.902e-3 | 8.866e-5 | 6.93 |
dark level 2e-5, unamplified 2.914e-4
I tried to lower the seed power to see if we have some pump depletion making us underestimate the NLG, but the half wave plate was already set to minimize the seed power.
Since the NLG looks to be about the same with 80 uW as 95uW, I set it to 80 uW for now.
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.
Lockloss @ 00:59 UTC after almost 23 hours locked - link to lockloss tool
No obvious cause.
Back to observing at 03:45 UTC.
As has been the norm recently, D/PRMI took a very long time to catch despite good alignment and buildups. There were also a few low-state locklosses due to the ALS-X PLL beatnote having an error, which would then take a few minutes to fix itself, so with everything together this was a lengthy relock (but I did not need to run an alignment; just some slight adjustments of PRM and BS).
After reaching low noise, SQZ couldn't lock because the SHG PZT voltage was low at around 3.4V and Guardian would not proceed. Relocking the SHG did not seem to move the PZT to a better place, so I simply lowered the minimum SHG PZT voltage threshold in SQZ_MANAGER from 5 to 3 and loaded the Guardian. After that, the SQZ_SHG Guardian is still giving a warning about the PZT voltage being low, but SQZ_MANAGER was able to make it to 'FRED_DEP_SQZ' and otherwise things looked okay, so I took H1 into observing. This may need to be reverted or addressed properly tomorrow. [Tagging SQZ]
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.
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
TITLE: 06/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.11 μm/s
QUICK SUMMARY:
H1's been locked for almost 12.5hrs and it looks like we had a brief outage from Observing due to the SQZ dropping us out just before 1300utc/6amPDT, but SQZ MANAGER and H1 got back to OBSERVING automatically within a 5min (coincidentally, this improved the H1 Range [which had been drifting down below 150Mpc] getting it back to above 150Mpc.
Environmentally, we are doing well; useism had been above the 50th percentile and has been drifting down from this for the last 10hrs. Winds are low and it is a cloudy and cool morning.
TITLE: 06/22 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 144Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: One lockloss this evening after a very short observing segment followed by an automatic relock; quiet shift otherwise. H1 has been locked and observing for almost 3 hours.
Lockloss @ 00:23 UTC after just 4 minutes of observing - link to lockloss tool
No obvious cause, but maybe a very small ETM glitch? The lockloss tool tags wind, which was getting up to about 30mph at the time.
Back to observing at 02:10 UTC. Fully automatic relock, but there was a lockloss at DRMI and it was taking a long time to catch after.
TITLE: 06/21 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:
LOG:
TITLE: 06/21 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Earthquake
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: EARTHQUAKE
Wind: 18mph Gusts, 7mph 3min avg
Primary useism: 0.18 μm/s
Secondary useism: 0.17 μm/s
QUICK SUMMARY: H1 is recovering from a recent earthquake and has just started an initial alignment.
Almost thought there was a chance we were going to ride through this earthquake (L1 went down 14 min before us), but alas the ground motion was too much for H1 and caused a lockloss. This ended a nearly 6.5hr lock for today's shift. Observatory Mode is in the EARTHQUAKE state until we get back to NLN. Will Stay in Prep For Locking for atleast 30more min.
Back to observing at 00:19 UTC. Fully automated relock after a fully automated initial alignment.
Measurement NOTES:
Attached is a screenshot of the Calibration Monitor + pdf of Pydarm Report
I've been adding the broadband measurements to this template which exists in [userapps]/cal/h1/dtt_templates
