We tuned FIS around 100HZ and then changed the SQZ angle +/-5deg, plot attached. Shiela thinks this could help us constrain thermal noise in the future.

Plot attached of today's data (SRCL offset at nominal -382) compared to last weeks while OM2 was hot (with SRCL offset tuned at -235). Solid lines are cold OM2, dashed lines are hot OM2. FIS is better with cold OM2 as expected.

We noticed that mean SQZ was different <100Hz with the OM2 hot vs Cold. This persisted if I changed the averages so wasn't caused by a glitch and also seemed to be increased looking at Sheila's 86736 data too. Changed SRCL offset to see if this was the cause but it didn't appear to be. Plot attached, so the cause is OM2.

Mon Sep 08 10:07:09 2025 INFO: Fill completed in 7min 5secs

Gerardo confirmed a good fill curbside. TC-A became good again at 05:56 this morning and looks nominal in today's fill.

Gerardo inspected the TCs and suspects TC-A wiring had been moved by animal activity. Why it corrected itself this morning is a mystery.

FAMIS 31102

The RefCav alignment has been drifting again this week and causing the signal on the TPD to drop, so this could use a touchup. I'll try to find some opportunistic time to do this after a lockloss either today or later this week.

No other major events of note.

TITLE: 09/08 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY:

• We've been locked for 5 hours, 1 lockloss overnight
  • Several small earthquakes overnight
• 09:25 UTC Observing
• Low wind
• Comissioning planned from 15:30 - 18:30 UTC

TITLE: 09/08 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 14:13 UTC (37 hr lock!)

LOG:

TITLE: 09/07 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 159Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: We stayed locked the whole shift, over 31 hours.
LOG: No log.

• A small earthquake from Alaska came through around 14:45 UTC
• The wind has picked up in the last 4 hours
• Looking at the noise shelf that appears in the 1-3 Hz groundmotion, EndX sees the most motion, there doesn't seem to be a noticible arrival time delay between any of the arms and the CS. Yesterday it started around 13:45 UTC and went until 20:50 UTC

TITLE: 09/07 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 14mph Gusts, 9mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.12 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 14:13 UTC (31 hr lock!)

Sun Sep 07 10:07:43 2025 INFO: Fill completed in 7min 39secs

Good fill. TC-A continues to be all over the shop, occasionally giving believable readings. Similar to yesterday it was TC-A which had a larger Delta-temp and triggered the end-of-fill, closely followed by TC-B.

TITLE: 09/07 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 4mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.12 μm/s
QUICK SUMMARY:

• We've been locked for almost 23 hours
  • We dropped Observing from 12:21 to 14:13 UTC from SQZ issues alog86797
• Some of the FOMs have a notification about wanting to be restarted due to obsolete binaries for "MEDM, caRepeater, xterm, and python"

Oli, Camilla (Oli did the work, I just wrote down what they did!)

Oli had been troubleshooting SQZ and found that when the OPO ISS tried to engage, it go to 10V and then unlocked. The OPO Trans output was only ~50uW on LOCKED_CLF_NO_ISS. This was meaning the ISS was maxing out it's 0-10V range to get to the nominal setpoint of 80uW. 

We could see on SQZT0 medm that the SHG output power was 81.2mW when nominal is ~ 100mW. This will reduce the available power to the OPO path. We followed the wiki to increase the SHG power (I should make the instructions of when to do this clearer) by adjusting the SHG SETTEMP. Doing this, Oli brought SHG power up from 81mW to 92mW. 

Then the OPO Trans output was ~65uW on LOCKED_CLF_NO_ISS (nominal 80uW). So Oli moved the waveplate between the +200MHz AOM and the SHG Rejected PD in the "to OPO" path to increase the available power sent into SHG launch. Then the AOM had enough range and the OPO could lock in LOCKED_CLF_DUAL_NO_ISS. 

Then Oli had issues with getting the FC to lock in Green so followed the wiki instructions to in do that too, trending to last good alignments with ZM3 (had moved 20urad on FC lockloss from ASC turning off) and then manually locking FC and increasing power with FC2, (FC1, ZM3) alignments. Oli increased the power in the 0,0 mode form 35 to 65 with alignments. Nominally this is > 80 but it had only been at 50 in the last lock, probably from the SHG power being low. 

Back to Observing 7:13amPT. 

TITLE: 09/07 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 20:03 UTC (13 hr lock)

Quiet shift. No locklosses. No Earthquakes.

The "bycicle" oscillations where CHARD_Y and DHARD_Y signals oscillate for ~20s seem anecdotally more frequent than yesterday's shift.

LOG:

TITLE: 09/06 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: GWSTAT is still down, we've been locked for 7.5 hours.
LOG: No log

• 13:42 Lockloss
  • 15:51 UTC Observing
  • 15:54 UTC PSL laser room 0.3um red alarm which persisted throughout the day with some yellow 0.5um alarms.
  • 19:30 - 20:03 UTC Dropped observing to run a calibration measurement with L1
  • 20:50 UTC We rode though a 5.4 from the Aleutians islands of Alaska

TITLE: 09/06 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 4mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 20:03 UTC (7 hr lock)

Well behaved, quiet and locked.

Calibration monitor before the measurement, measurement report.

Broadband:

Start: 2025-09-06 19:31:00 UTC

Stop: 2025-09-06 19:36:11 UTC

File: 2025-09-06 12:31:00,345 measurement output: /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20250906T193100Z.xml

Simulines:
Start: 2025-09-06 19:37:39 UTC // 1441222677 GPS

Stop: 2025-09-06 20:01:00 UTC // 1441224078.696016 GPS

Files:

2025-09-06 20:01:00,541 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20250906T193739Z.hdf5
2025-09-06 20:01:00,548 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20250906T193739Z.hdf5
2025-09-06 20:01:00,552 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20250906T193739Z.hdf5
2025-09-06 20:01:00,557 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20250906T193739Z.hdf5
2025-09-06 20:01:00,561 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20250906T193739Z.hdf5

Sat Sep 06 10:07:21 2025 INFO: Fill completed in 7min 17secs

From TC-B it looks like a good fill. TC-A started misbehaving at 06:47 this morning, it had rejoined TC-B just prior to the fill at 09:45 before diverging again.

For reference sunrise today was 06:25. Weather is overcast.