Link to report here.

Summary:

• H1 had an average duty cycle of 83.41% for the week, which is an increase from last week (78.1%).
• A somewhat quiet (glitch and noise-wise) week for the detector.
• Nine relevant seismic events throughout the week; five of these caused lock-losses (Monday, Tuesday, Saturday, and Sunday), while the rest caused some noise in the spectrograms in the 15-50Hz frequency band (Wednesday to Saturday).
• The BNS range fluctuated from around 150 to 160Mpc throughout the week. On Wednesday, we had a significant 10MPc drop around 11:00-11:45 UTC; the corresponding aLog pointed “FC backscatter into the IFO” as the responsible.
• On Tuesday we had eight very short lock-losses due to the OPO losing lock.
• ETM glitches caused two lock-losses throughout the week (Tuesday and Thursday).
• We observed persistent violin modes (specifically fundamental at ~500Hz, and some 2nd harmonics at ~1000Hz) following large lock-losses all week but on Wednesday. The most persistent one appeared later on Thursday and did not fade away until Friday morning. Last week the fundamental modes were also reported due to their persistency.
• FScan Plots appeared everyday but on Monday. Lowest line count on Tuesday with ~2300 lines and highest on Friday with ~2900 lines.
• Relevant Round Winners:
  • H1:ASC-Y_TR_B_NSUM_OUT_DQ: Winnertwice (Monday and Saturday) and second place twice (Wednesday and Friday).
  • H1:ASC-Y_TR_B_PIT_OUT_DQ: Third place twice (Monday and Thursday) and once on second place (Saturday).
  • H1:ASC-Y_TR_A_NSUM_OUT_DQ: Third place twice (Tuesday and Sunday) and once on second place (Thursday).
  • H1:ASC-Y_TR_A_YAW_OUT_DQ: Winner once (Wednesday) and second place once (Tuesday).
  • H1:SQZ-FC_WFS_A_I_PIT_OUT_DQ: Winner once (Tuesday).
  • H1:SQZ-FC_LSC_DOF2_OUT_DQ: Winner once (Thursday).
  • H1:SQZ-FC_LSC_DOF2_IN1_DQ: Winner once (Friday).
  • H1:LSC-POP_A_RF9_I_ERR_DQ: Winner once (Sunday).

Lockloss at 2025-09-01 20:07 UTC after almost 5 hours locked

Mon Sep 01 10:08:48 2025 INFO: Fill completed in 8min 44secs

TITLE: 09/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY:

Currently Relocking and in DRMI_LOCKED_CHECK_ASC

TITLE: 09/01 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: One lockloss with an easy recovery, YARM just took a little while. We've been locked for 45 minutes.
LOG: No log

• 02:54 UTC Lockloss
  • 03:10 UTC We started getting lightning around site, as seen on the cameras

  • 04: 19 UTC Observing

Lockloss 02:54 UTC

TITLE: 08/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Currently Observing at 158 Mpc and have been Locked for 5 hours. Lockloss was fast and easy to recover from - the IFO just needed my help grabbing ALSY for the same reason we've been seeing for a while: SCAN_ALIGNMENT had taken it to a good-looking spot (above 1), but it wasn't high enough to catch. A few taps was all that was needed.
We had another test of using the ASC Hi Gains button again! During the earthquake, peakmon started creeping up above 500, and picket fence was showing multiple stations were yellow or orange. I tried to hold off on leaving Observing as long as possible since the ground motion wasn't that bad yet, but I eventually started the transition to ASC Hi Gain when I saw peakmon hit 900, but it quickly went above 900 and by the time we started transitioning over, we were above 1200 and quickly increasing. Luckily, we didn't lose lock, but we were close, so I definitely should've transitioned over sooner! This earthquake went up to 2200 on peakmon. Afterwards, the transition back went smoothly.
LOG:

14:30 UTC Observing and Locked for almost 3 hours
17:17 Lockloss
    - Had to adjust ALSY a bit for it to be able to catch
18:30 NOMINAL_LOW_NOISE
    18:33 Observing
    20:06 Earthquake mode activated
    20:17 I took us out of Observing and selected ASC Hi Gain to try and ride out the earthquake
    20:34 Back to regular NLN gains and back into Observing
 

TITLE: 08/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 7mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

• We've been locked for 4.5 hours
• Secondary microseism is decreasing, wind is low

Lockloss at 2025-08-31 17:17 UTC after 5.5 hours locked

Sun Aug 31 10:07:39 2025 INFO: Fill completed in 7min 35secs

TITLE: 08/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
OUTGOING OPERATOR: Tony
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:

Currently Observing at 156 Mpc and have been Locked for almost 3 hours.

TITLE: 08/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

H1 has been locked entire shift and NO drops from Observing (H1 locked for 7.75hrs).  Did not get to run Simulines due to L1 also being UP the whole time.
LOG:  n/a

TITLE: 08/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Observing at 158 Mpc and have been Locked for 2.5 hours. Relocking after the earthquake knocked us out was pretty easy - I just had to run an initial alignment after we lost lock in START_TR_CARM from a bad alignment.
LOG:

14:30 UTC Observing and Locked for over 13.5 hours
16:23-16:27 Small plane flying overhead Tagging DetChar
18:31 Out of Observing for Calibration suite
19:01 Lockloss during calibration sweep due to sudden local earthquake
    - Initial alignment run
21:10 NOMINAL_LOW_NOISE
    21:13 Observing

TITLE: 08/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 5mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY:

Handoff from Oli was straightforward.  I'll monitor L1 for downtime, in case H1 can have an opportunity for a Simulines Calibration opportunity (simulines failed earlier due to the Nevada EQ).  H1's currently been locked for 2.5hrs (almost thermalized). 

Lockloss at 2025-08-30 19:01 UTC due to sudden local earthquake (picket fence, ndscope) right near the end of running simulines. We had been Locked for just over 18 hours.