• 20:43:00 UTC I saw the OTR station on picket-fence start seeing some motion
• 20:43:08 UTC Verbal warned of an incoming nearby earthquake from Canada
• 20:43:10 UTC Earthquake mode activated
• 20:43:25 UTC I opened up ISI_CONFIG and saw it was a 7.3 and decided click the big red "VERY LARGE EQ" button for the first time
  • This ended up tripping the ISI on HAM7 & 8 and the OPO in HAM7.
• 20:45 - 48 UTC The S wave peaked and tripped HAM1 ISI and BS ISI ST1 & 2
  • The R wave came through a few minutes later

We had a slight power glitch similar to the Sunday Power Glitch. The control room lights flickered, but like Sunday no UPS detected the glitch. Unlike Sunday there were no HEPI pump controller trips.

20:29 UTC Lockloss

Seeing LLO had dropped observing from what looked like a SQZ issue, we briefly dropped Observing from 18:21 to 18:25 to adjust the OPO temperature then run a SQZ_ANG_ADJ. We didn't change the OPO temperature or SQZ angle very much but the high frequency BLRMs look a little better.

We've been locked for 13 hours.

Wed Jul 16 10:04:46 2025 INFO: Fill completed in 4min 42secs

The EX roof weather station wind speed anemometer stopped turning around 5th May 2025. Similar to the MX station (alog 83850 10apr2025) it started by becoming unresponsive to light winds, but unlike MX it eventually completely froze. Presumably this is a bearing issue.

Closes FAMIS37207, last checked in alog85091

Looks mostly normal, HPI-PUMP_LO_CONTROL_VOUT continues to slighty trend down. There was a small drop in EY and EX pressure on Sun the 13th, I'm assuming it was from the power glitch that tripped off the HEPI pump controllers alog85722.

TITLE: 07/16 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: SEISMON_ALERT
    Wind: 13mph Gusts, 9mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY:

• We've been locked for just over 9 hours
• Wind is low/moderate, and secondary microseism is low
• 5.0 earthquake's R waves coming in from Japan in 10 minutes

Signal railed about 6:28 PM local time, I checked trend data for PT120 and no pressure rise noted inside the main volume.  Attached is a 14 hour trend of the pump behavior and PT120 (main volume internal pressure).

System will be evaluated as soon as possible.

TITLE: 07/16 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

Currently relocking and in MOVE_SPOTS. This last relock was looking so bad up until ENGAGE_ASC_FOR_FULL_IFO, I am very surprised it made it (40min build ups). The first lock reacquisitoin of my shift, ALSX was having some issue with the crystal frequency and was losing lock a lot. Also, there were many times when it was looking really bad but would hold on (ndscope). Besides ALSX having trouble that first round of relocking, there haven't been any issues.
LOG:

21:20UTC Observing at 137Mpc and have been Locked for 29 minutes
21:23 Dropped out of Observing to touch up OPO temperature and run scan sqz ang
21:27 Observing

22:34 Lockloss
    - Alignment looked so bad during DRMI. I tried adjusting for a while, but eventually started an initial alignment
    - Multiple lockloss due to ALSX unlocking
00:52 NOMINAL_LOW_NOISE
00:55 Observing

04:12 Lockloss                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

A partial continuation of showing the characterization of the OSEM noise before versus after the satellite amplifier swaps. Today, PR2, MC2, TMSX, and ETMX M0 R0 L1 were swapped out (85770), but here I am only showing the comparison plots for PR2 and MC2. I will have to wait until we have a longer period of being in DOWN before I can get good comparisons for TMSX and ETMX because there has not been very much time after the swaps where we weren't locking or where the seismic environment wasn't set to maintenance, which results in a ton of extra noise that isn't able to be properly regressed out.

Here are the previous comparisons: 85485, 85699

PR2
Results
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PR2/SAGM1/Results/allDampRegressCompare_H1SUSPR2_M1_NoiseComparison_1435154988vs1436654703-1200.pdf
r12453
Data
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PR2/SAGM1/Data/dampRegress_H1SUSPR2_M1_1435154988_1200.mat
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PR2/SAGM1/Data/dampRegress_H1SUSPR2_M1_1436654703_1200.mat
r12453

MC2
Results
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/SAGM1/Results/allDampRegressCompare_H1SUSMC2_M1_NoiseComparison_1436631330vs1436638358-1200.pdf
r12454
Data
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/SAGM1/Data/dampRegress_H1SUSMC2_M1_1436631330_1200.mat
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/SAGM1/Data/dampRegress_H1SUSMC2_M1_1436638358_1200.mat
r12454

Lockloss at 2025-07-16 04:12 UTC after almost 3.5 hours locked

Closes FAMIS#28414, last checked 85483

The ITMX measurements actually had enough coherence this week!

ITMX

ITMY

ETMX

ETMY

9:00 - 12:30
Janos

The Kobelco compressor and drying towers have been switched on today during the maintenance period for validation purposes (similarly to the EX dry air system earlier - aLog 85469). At the X-manifold, a KF50 venting port has been opened up, and the air was flowing with full throttle during 3.5 hours. Despite of this, the compressor kept stopping, and the dew point went down nicely.
The measured data:
- Dew point right before switching off the dryer towers (measured by the in-built dew point meter): -49 deg F (=-45 deg C)
- Dew point at the end of the testing period at the X-manifold venting port (measured by our portable dew point meter): -43.6 deg C
- Particle count at the end of the testing period at the X-manifold venting port (measured by our portable particle counter): 0 for all sizes
- FTIR tests have also been taken at the vent port, and the vial is now in storage

This completes the installation and validation process for the Kobelco, and so it is now OK to use for venting (similarly to the EX system).

Lockloss at 2025-07-15 22:34 UTC from unknown causes

Using Vibration Sensors To Gauge Health Of HVAC Fans Site Wide Famis 26406

 

Monthly Dust trends FAMIS 37254

I've attached the Dust mon plots for the past month.

(Jordan V., Gerardo M.)

Today we replaced the MKS gauge at FC-C-1, this is the first 6 way cross inside the filter cavity tube enclosure, we installed serial number 390F00490, twice, yes two times.  It turns out that the flange has some scratches on the knife edge, and it was not going to seal regardless of the effort that we put into it.  Once the gauge was removed the scratches transferred to the copper gasket.  We replaced it with serial number 390F00495, this one seems to be doing good.  New conflat was leak tested and no leak was detectable above 2.42e-10 torr*l/sec.

The old gauge serial number is 390F00406 with a date code of June 2021.