aLIGO LHO Logbook

H1 General - Updating TCS SIM values

matthewrichard.todd@ligo.org — Thu, 13 Nov 2025 12:41:05 -0800

Author: matthewrichard.todd@ligo.org

Report ID: 88093

M. Todd

From some of the modeling I've been doing, I've come up with a slew of estimates for coupling factors of TCS power settings to substrate and surface defocus. I've put them into TCS and SDF'd them, hoping that the next week or two we get some good confirmation of these numbers.

Images attached to this report

X1 General - Comment to All 1064 [nm] HR, 45 deg AOI Optics from C2500044 Coating Run Etched with Wrong Coating Spec DCC Number

corey.gray@ligo.org — Thu, 13 Nov 2025 12:05:26 -0800

Author: corey.gray@ligo.org

Report ID: 88092

Another bookkeeping mistake found (RyanS noticed that in ICS I marked all the 50/50 splitters with the wrong batch number. Deleted these parts from ICS and just re-uploaded with the correct batch number. We will also update their PETG containers and bags with the correct batch. (this is an easy fix unlick the errant ones which had the physical error etched on the optics themselves IRL).

Yet again, the permalink for the SPI optics has been updated. It is now this permalink.

H1 PSL - Comment to IMC_LOCK stuck in FAULT due to FSS oscillation

jason.oberling@ligo.org — Thu, 13 Nov 2025 11:07:22 -0800

Author: jason.oberling@ligo.org

Report ID: 88090

Took a look at this, see attached trends. What happened here is the FSS autolocker got stuck between states 2 and 3 due to the oscillation. The autolocker is programmed to, if it detects an oscillation, jump immediately back to State 2 to lower the common gain and ramp it back up to hopefully clear the oscillation. It does this via a scalar multiplier of the FSS common gain that ranges from 0 to 1, which ramps the gain from 0dB to its previous value (15dB in this case); it does not touch the gain slider, it does it all in block of C code called by the front end model. The problem here is that 0dB is not generally low enough to clear the oscillation, so it gets stuck in this State 2/State 3 loop and has a very hard time getting out of it. This is seen in the lower left plot, H1:PSL-FSS_AUTOLOCK_STATE, it never gets to State 4 but continuously bounces between States 2 and 3; the autolocker does not lower the common gain slider, as seen in the center-left plot. If this happens, turning the autolocker off then on again is most definitely the correct course of action.

We have an FSS guardian node that also raises and lowers the gains via the sliders, and this guardian takes the gains to their slider minimum of -10dB which is low enough to clear the majority of oscillations. So why not use this during lock acquisition? When an oscillation is detected during the lock acquisition sequence, the guardian node and the autolocker will fight each other. This conflict makes lock acquisition take much longer, several 10s of minutes, so the guardian node is not engaged during RefCav lock acquisition.

Talking with TJ this morning, he asked if the FSS guardian node could handle the autolocker off/on if/when it gets stuck in this State 2/State 3 loop. On the surface I don't see a reason why this wouldn't work, so I'll start talking with Ryan S. about how we'd go about implementing and testing this. For OPS: In the interim, if this happens again please do not wait for the oscillation to clear on its own. If you notice the FSS is not relocking after an IMC lockloss, open the FSS MEDM screen (Sitemap -> PSL -> FSS) and look at the autolocker in the middle of the screen and the gain sliders at the bottom. If the autolocker state is bouncing between 2 and 3 and the gain sliders are not changing, immediately turn the autolocker off, wait a little bit, and turn it on again.

OpsInfo

Images attached to this report

LHO VE - Thu CP1 Fill

david.barker@ligo.org — Thu, 13 Nov 2025 10:58:50 -0800

Author: david.barker@ligo.org

Report ID: 88091

Thu Nov 13 10:13:43 2025 INFO: Fill completed in 13min 39secs

Gerardo confirmed a good fill curbside.

Images attached to this report

H1 DetChar - With voltage set to 0, grounding of the ITMX ESD driver

joan-rene.merou@ligo.org — Thu, 13 Nov 2025 10:26:03 -0800

Author: joan-rene.merou@ligo.org

Report ID: 88089

[Joan-Rene Merou, Alicia Calafat, Sheila Dwyer, Jenne Driggers] We have entered the LVEA and went to the Beer garden. There, we first turned off the Low Voltage ITM ESD Driver D1600092, first the 15V switch and then the medium voltage switch. In order to turn it on again, it should be reconnected in the opposite order. With the voltage request set to 0 and chassis powered off, we have unplugged the SHV cables going to the chamber and plugged into Robert's ground boxes, which we used to ground to the rack which is grounded to the chamber. This has been done at both drivers (See attached photos). Afterwards, we have changed the code at /opt/rtcds/userapps/release/isc/h1/guardian/ISC_LOCK.py in order that the LOWNOISE_COIL_DRIVERS will go to LOWNOISE_ESD_ETMY instead of TRANSITION_FROM_ETMX. This has been done by changing lines 6670 and 6674, moving the ", 15" step from line 6670 to 6674. Finally, we communicated the change to the operator and loaded the guardian.DetChar

Images attached to this report

H1 SQZ - OMC scan with SQZ beam and cold OM2, changing ZM4/5 -- 20251113

matthewrichard.todd@ligo.org — Thu, 13 Nov 2025 09:34:38 -0800

Author: matthewrichard.todd@ligo.org

Report ID: 88088

M. Todd, S. Dwyer

We wanted to get a couple of measurements of the OMC mismatch with the SQZ beam when we changed from the nominal setting for only one of the ZMs at a time. OM2 was cold for all of these measurements.

Measurement	Time	OMC Mismatch [%]
ZM4 = 6.2, ZM5 = -0.4 (nominal)	1447088389	2.8
ZM4 = 4, ZM5 = -0.4	1447088919	2.4
ZM4 = 6.2, ZM5 = -4.5	1447089464	10.5

It seems the ZM4 is not a very strong actuator for changing the mode at the OMC.

Images attached to this report

H1 PSL - IMC_LOCK stuck in FAULT due to FSS oscillation

oli.patane@ligo.org — Thu, 13 Nov 2025 09:29:07 -0800

Author: oli.patane@ligo.org

Report ID: 88087

During PRC Align, IMC unlocked and couldn't relock due to the FSS oscillating a lot - PZT MON was showing it moving all over the place, and I couldn't even take the IMC to OFFLILNE or DOWN due to the PSL ready check failing. To try and fix the oscillation issue, I turned off the autolock for the Loop Automation on the FSS screen, and after a few seconds re-enabled the autolocking, and then we were able to go to DOWN fine, and then I was able to relock the IMC.

TJ said this has happened to him and to a couple other operators recently.

Images attached to this report

H1 General - Comment to Ops Day Shift Start

david.barker@ligo.org — Thu, 13 Nov 2025 08:22:15 -0800

Author: david.barker@ligo.org

Report ID: 88086

I restarted VACSTAT at 08:18 to clear its alarm. Tyler resolved the RO alarm at 06:17 and now the CDS ALARM is GREEN again.

H1 CDS - EY vacuum glitch at beam tube ion pump 03:00:16 Thu 13 Nov 2025 PST

david.barker@ligo.org — Thu, 13 Nov 2025 08:10:09 -0800

Author: david.barker@ligo.org

Report ID: 88085

VACSTAT detected a vacuum glitch at 03:00:24 this morning originating with PT427 (EY beam tube ion pump station, about 1000 feet from EY). The vacuum pressure rapidly increased from 1.4e-09 to 1.4e-07 Torr. It then rapidly pumped back down to nominal in 8 seconds. The glitch was detected soon afterwards by all of the gauges in EY. They only increased from around 1.0e-09 to 2.0e-09 and they took around 25 minutes to pump down.

The glitch was seen at MY as a much reduced amplitude about 6 minutes after the event.

H1 was not locked at the time.

Images attached to this report

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Thu, 13 Nov 2025 07:37:14 -0800

Author: oli.patane@ligo.org

Report ID: 88084

TITLE: 11/13 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Microseism
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 3mph Gusts, 0mph 3min avg
Primary useism: 0.05 μm/s
Secondary useism: 1.22 μm/s
QUICK SUMMARY:

Currently in DOWN due to excessively high secondary microseism. We're supposed to have calibration measurements and commissioning today. I'll try for a bit to get us back up, but I doubt we'll get past DRMI since it's worse now than it was last night for Ryan or TJ

H1 General - Ops Owl Update

thomas.shaffer@ligo.org — Thu, 13 Nov 2025 02:54:02 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88083

The useism continues to grow. I'll keep the IFO in down and see where things are at again in a few hours.

LHO General - Ops Eve Shift Summary

ryan.short@ligo.org — Wed, 12 Nov 2025 22:01:00 -0800

Author: ryan.short@ligo.org

Report ID: 88082

TITLE: 11/13 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: TJ
SHIFT SUMMARY: H1 was happily observing until mid-shift when the microseism just got too high and caused a lockloss. Haven't been able to make it past DRMI since then due to the ground motion. I'm leaving H1 in 'DOWN' since it's not having any success, but TJ says he'll check on things overnight.
LOG:

02:44 - Lockloss - alog88081

H1 General - Lockloss @ 02:44 UTC

ryan.short@ligo.org — Wed, 12 Nov 2025 19:19:05 -0800

Author: ryan.short@ligo.org

Report ID: 88081

Lockloss @ 02:44 UTC - link to lockloss tool

Possibly caused by ground motion, as everything looked to be moving quite a lot at the time, and the secondary microseism band has been rising this evening. Environment plots on the lockloss tool show a quick increase in motion at the time of the lockloss also.

Lockloss

H1 General - Comment to Ops Day Shift End

david.barker@ligo.org — Wed, 12 Nov 2025 17:08:49 -0800

Author: david.barker@ligo.org

Report ID: 88080

Tyler has the reverse osmosis water conditioning system offline overnight. The CDS alarms system has an active cell-phone bypass for this channel which expires tomorrow afternoon. This should be the only channel in CDS ALARM.

Bypass will expire:
Thu Nov 13 05:05:22 PM PST 2025
For channel(s):
H0:FMC-CS_WS_RO_ALARM

H1 General - Ops Day Shift End

oli.patane@ligo.org — Wed, 12 Nov 2025 16:36:22 -0800

Author: oli.patane@ligo.org

Report ID: 88079

TITLE: 11/13 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Observing at 140 Mpc and have been Locked for over 16.5 hours. One short drop out of Observing due to the squeezer dropping out, but that relocked automatically and we're been Observing ever since. GRB-Short E617667 came in today at 21:29 UTC
LOG:

15:30UTC Observing and Locked for over 7.5 hours
15:52 Out of Observing due to SQZ unlock
15:56 Back into Observing
21:29 GRB-Short E617667

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
16:00	FAC	Randy	YTube	n	Caulking up those joints	22:57
17:04	FAC	Kim	MX	n	Tech clean	18:34
18:21		Sheila. Kar Meng	Optics Lab	y(local)	OPO prep (Sheila out 18:57)	19:10
18:51	VAC	Gerardo	MX	n	Looknig for case	20:07
20:09		Corey	OpticsLab	n	Cleaning optics	23:33
21:26		Kar Meng	Optics Lab	y(local)	OPO prep	23:28
22:01		RyanS	OpticsLab	n	Cleaning optics	23:33
22:10		TJ	Optics Lab	n	Spying on Corey and RyanS	22:22
22:59		Matt	Optics Lab	n	Grabbing wipes	23:16
23:34		Matt	Prep Lab	n	Putting wipes away	23:35

LHO General - Ops Eve Shift Start

ryan.short@ligo.org — Wed, 12 Nov 2025 16:02:33 -0800

Author: ryan.short@ligo.org

Report ID: 88078

TITLE: 11/13 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 5mph Gusts, 3mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.56 μm/s
QUICK SUMMARY: H1 has been locked for 16 hours and observing the whole day.

Wind low, microseism on the rise
All other systems nominal

LHO VE - Wed CP1 Fill

david.barker@ligo.org — Wed, 12 Nov 2025 11:52:26 -0800

Author: david.barker@ligo.org

Report ID: 88077

Wed Nov 12 10:08:17 2025 INFO: Fill completed in 8min 13secs

Gerardo confirmed a good fill curbside.

Images attached to this report

H1 GRD - Comment to h1guardian1 machine reboot and point back at nds0

erik.vonreis@ligo.org — Wed, 12 Nov 2025 10:17:47 -0800

Author: erik.vonreis@ligo.org

Report ID: 88076

Server order is set in the guardian::lho_guardian profile in puppet.

H1 AOS - ISI CPS Noise Spectra Check Weekly FAMIS

oli.patane@ligo.org — Wed, 12 Nov 2025 09:18:58 -0800

Author: oli.patane@ligo.org

Report ID: 88075

Closes FAMIS#27534, last checked 87787

I was supposed to do this last week but I was out, so doing it now. Last time it was done was 10/28, so this is comparing to measurements from two weeks ago.

Nothing of note, everything looks very similar to how it looked a couple weeks ago.

Non-image files attached to this report

CPS_spectra_08:05-11_12_2025.pdf

H1 General - Comment to Ops Day Shift Start

oli.patane@ligo.org — Wed, 12 Nov 2025 07:45:51 -0800

Author: oli.patane@ligo.org

Report ID: 88074

Looks like we had a few events come in last night besides the superevent:

11/12 06:29 UTC GRB-Short E617425

11/12 13:35 UTC GRB-Short E617519

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Wed, 12 Nov 2025 07:38:05 -0800

Author: oli.patane@ligo.org

Report ID: 88073

TITLE: 11/12 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 3mph Gusts, 1mph 3min avg
Primary useism: 0.05 μm/s
Secondary useism: 0.37 μm/s
QUICK SUMMARY:

Observing at 148 Mpc and have been Locked for over 7.5 hours. Currently in a standdown due to Superevent S251112cm that came in at 11/12 15:19 UTC

LHO General - Ops Eve Shift Summary

ryan.short@ligo.org — Tue, 11 Nov 2025 22:03:54 -0800

Author: ryan.short@ligo.org

Report ID: 88072

TITLE: 11/12 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: A completely uneventful shift with H1 observing throughout. Now been locked for almost 7 hours.

H1 CDS - WP 12876 Update the run number server to help test the new frame writer

jonathan.hanks@ligo.org — Tue, 11 Nov 2025 17:21:29 -0800

Author: jonathan.hanks@ligo.org

Report ID: 88071

As per WP 12876 I updated the run number server with a new version to allow more testing of the new frame writer (h1daqfw2), without allowing it to modify external state in CDS.

The run number server tracks channel list configuration changes in the frames. The basic idea is the the frame writers create a checksum/hash of the channel list, send it to the run number server and get a run number to include in the frame. This is then used by the nds1 server to optimize multi-frame queries (if it knows the configuration hasn't changed some of the structures can be re-used between frames (this has been measured at about a 30% speed-up)).

This update added a new port/interface that the server listens on. It behaves a little different, it will only return the current run number (or 0 if the hash doesn't match) and will not increment the global state, so it is safe to have a test system use.

Now the new frame writer can automatically query the run number server to get the correct value to put in the frame (previously we had been setting it via a epics variable). One step closer to the new frame writer being in production.

H1 SUS - In-Lock SUS Charge Measurement - Weekly

ryan.short@ligo.org — Tue, 11 Nov 2025 16:39:11 -0800

Author: ryan.short@ligo.org

Report ID: 88070

FAMIS 28431, last checked in alog87986

New data points for all quads this week, measurement trends attached.

Images attached to this report

H1 General - Ops Day Shift End

oli.patane@ligo.org — Tue, 11 Nov 2025 16:29:59 -0800

Author: oli.patane@ligo.org

Report ID: 88069

TITLE: 11/12 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Currently Observing at 150 Mpc and have been Locked for just over an hour. Maintenance day was pretty light, but on the way back up there was some testing done with using the ETMY ESD (88065), so it took us a bit longer to get back to Observing. Besides that, getting back up wasn't bad at all.
LOG:

15:30UTC Locked and Out of Observing due to magnetic injections
15:40 Back to Observing
15:45 Out of Observing due to SUS charge measurements
16:01 Back into Observing after SUS charge measurements finished
16:01 Out of Observing to change the OM2 setpoint and unlock the IFO
16:03 I unlocked the IFO for maintenance

19:58 Started relocking
- initial alignment
- lockloss from LOWNOISE_COIL_DRIVERS due to commissioning
23:17 NOMINAL_LOW_NOISE
23:28 Observing

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:46	FAC	Randy	YARM	n	Caulking beam tubes	23:00
16:05	PEM	Sam, Alicia	HAM1	n	Installing accelerometers	17:00
16:06	FAC	Nellie, Kim	LVEA	n	Tech clean	16:59
16:12	ISC	Matt	CR	n	IFO at 60W !!!!!!!!!!!!!!!!!!!	16:59
16:12	VAC	Jordan	EY	n	Purge air line build	16:15
16:16	VAC	Gerardo, Jordan	LVEA	n	Checking CP1 and for HAM1 gate valve	16:39
16:19	PEM	Rene	LVEA	n	Helping with HAM1 accelerometer install	17:00
16:30	FAC	Tyler	MX, EX, EY	n	Roof inspections	17:44
16:34	VAC	Travis	EY	n	Purge air line build	19:46
16:35	FAC	Mitchell	LVEA	n	Putting away and grabbing parts	16:59
16:39	VAC	Jordan, Gerardo	EY	n	Purge air line work	19:24
17:00	FAC	Nellie, Kim	EY	n	Tech clean	18:31
17:13	EE	Fil	EX, EY	n	Prepping for 28-bit DAC	19:06
17:14	PEM	Sam, Rene, Alicia	LVEA	n	Moving accelerometers	17:44
17:16		Richard	LVEA	n	Walking around	17:36
17:28		Betsy	CER	n	Inventory/looking for stuff	18:28
17:45	3IFO	Tyler	LVEA, MX, MY	n	3IFO checks	18:29
18:29	FAC	Tyler	Yarm backside	N	Inspect well water piping	19:07
18:31	FAC	Nellie, Kim	EX	n	Tech clean	19:59
19:06	EE	Fil	CER	N	Checks	20:02
19:41		Mitchell	LVEA	n	Looking at parts	19:46
19:58		RyanC	LVEA	n	Sweep	20:10
20:50		Kar Meng	OpticsLab	n	Looking at components	21:00
21:07		Corey	OpticsLab	n	Cleaning optics	00:13
21:39		Rahul	OpticsLab	n	Wrapping up optics	21:59
22:18		RyanS	OpticsLab	n	Cleaning optics	00:09
22:20	SUS	Kar Meng	OpticsLab	y(local)	OPO prep work	23:46
23:58		Betsy	OpticsLab	n	Looking for parts	00:14
00:08		Kar Meng	OpticsLab	y(local)	OPO prep work	ongoing

LHO General - Ops Eve Shift Start

ryan.short@ligo.org — Tue, 11 Nov 2025 16:15:31 -0800

Author: ryan.short@ligo.org

Report ID: 88068

TITLE: 11/12 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 8mph Gusts, 5mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.26 μm/s
QUICK SUMMARY: H1 has been locked for about an hour following Tuesday maintenance day.

Wind low, microseism steady below 90th percentile
All other systems nominal

H1 SUS - Comment to Most of the rest of the measurements for H1SUSPRM for Estimator

oli.patane@ligo.org — Tue, 11 Nov 2025 16:00:45 -0800

Author: oli.patane@ligo.org

Report ID: 88067

complete PRM measurements: 88063

H1 SUS - Comment to H1SUSPRM M3, M2, and M1 Drive to M1 Response TFs to inform Estimator Models

oli.patane@ligo.org — Tue, 11 Nov 2025 15:57:13 -0800

Author: oli.patane@ligo.org

Report ID: 88066

Here's the list of estimator measurements for PRM: 88063

H1 SUS - More measurements for PRM and SRM estimators

oli.patane@ligo.org — Tue, 11 Nov 2025 15:56:37 -0800

Author: oli.patane@ligo.org

Report ID: 88063

I was able to get some more measurements done for the PRM and SRM estimators, so I'll note them and then summarize the current measurement filenames because there's a lot (previous measurements taken 87801 and 87950)

PRM
DAMP Y gain @ 20%
I was able to finish taking the final few DAMP Y @ 20% gain for H1SUSPRM M1 to M1.

Settings
- PRM aligned
- DAMP Y gain to 20% (L and P gains nominal)
- CD state to 1
- M1 TEST bank gains all at 1 (nominally P and Y have a gain other than 1)
Measurements
2025-11-11_1700_H1SUSPRM_M1toM1_CDState1_M1YawDampingGain0p1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml r12789
- I took the measurements for V, R, P, and Y today since Jeff had taken L and T a couple weeks ago for this configuration
- To try and lessen confusion, I changed date/time of all M1 to M1 PRM DAMP Y gain @ 20% measurements to 2025-11-11_1700 so they're all together. This means the M1 to M1 L and T measurements from a couple weeks ago now have this as the date/time

SRM
DAMP {L,P,Y} gain at 20%
I took HAM5 SUSPOINT to SRM M1 measurements

Settings
- SRM aligned
- DAMP {L,P,Y} gain to 20%
- CD state to 1
Measurements
2025-11-11_1630_H1ISIHAM5_ST1_SRMSusPoint_M1LPYDampingGain0p1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml r12790
- P and Y don't have very good coherence, but I ran out of time to try larger gains

Big measurement list:
PRM measurements:
DAMP gain LPY @ 20% (-0.1)
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PRM/
SUSPOINT to M1
Common/Data/2025-11-04_1800_H1ISIHAM2_ST1_PRMSusPoint_M1LPYDampingGain0p1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml
M1 to M1
SAGM1/Data/2025-10-28_H1SUSPRM_M1toM1_CDState1_M1LPYDampingGain0p1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml
M2 to M1
SAGM2/Data/2025-10-28_H1SUSPRM_M2toM1_CDState2_M1LPYDampingGain0p1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
M3 to M1
SAGM3/Data/2025-10-28_H1SUSPRM_M3toM1_CDState2_M1LPYDampingGain0p1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml

DAMP gain Y @ 20% (-0.1)
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PRM/
SUSPOINT to M1
Common/Data/2025-11-04_1930_H1ISIHAM2_ST1_PRMSusPoint_M1YawDampingGain0p1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml
M1 to M1
SAGM1/Data/2025-11-11_1700_H1SUSPRM_M1toM1_CDState1_M1YawDampingGain0p1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml
M2 to M1
SAGM2/Data/2025-10-28_H1SUSPRM_M2toM1_CDState2_M1YawDampingGain0p1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
M3 to M1
SAGM3/Data/2025-10-28_H1SUSPRM_M3toM1_CDState2_M1YawDampingGain0p1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml

SRM (so far)
DAMP gain LPY @ 20% (-0.1)
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/
SUSPOINT to M1
Common/Data/2025-11-11_1630_H1ISIHAM5_ST1_SRMSusPoint_M1LPYDampingGain0p1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml

SEI

H1 ISC - Successful lock using ETMY ESD, not ITMX

jenne.driggers@ligo.org — Tue, 11 Nov 2025 15:51:35 -0800

Author: jenne.driggers@ligo.org

Report ID: 88065

[Jenne, Alicia, Joan-Rene, with suggestions from Sheila]

Today we tested using ETMY to transition the ETMX ESD, rather than the usual locking procedure of ITMX. I had checked on the guardian code for this last week, alog 87997. It worked! The first time we tried transitionining back to ETMX, we lost lock, but the second time that also worked. We are currently locked at NLN and observing, having gotten here using ETMY and not any stages of ITMX for the ESD transition. This means that we're ready to try grounding the ITM ESDs, to see if that helps reduce the combs that Alicia and Joan-Rene have been investigating.

The first time we tried locking, we went through the state LOWNOISE_ESD_ETMY by hand, so that we could transition ETMX -> ETMY slowly and measure the DARM loop along the way.
- We measured the DARM open loop gain before any transitioning, then after 25%, after 50%, after 75%, and after we were fully on ETMY. See attached plot with the measurements labeled on the right side with percent of actuation on ETMY.
- When we tried to transition back ETMY -> ETMX 25% of the way, (doing the state LOWNOISE_ESD_ETMX by hand), we lost lock.
  - After looking through the settings, it could be that the ETMX L1 Lock L filter bank wasn't set correctly (FM2 not on), even though I see that in my guardian shell I told it to turn on.
  - Or, as Sheila points out to us, it could be that this transition back to ETMX is rather delicate, and we're going from using 2 stages of the temporary (ETMY) suspension to 3 stages on low noise ETMX, and we just can't do that part way.
The second time we tried locking, we let the guardian go through LOWNOISE_ESD_ETMY, which was successful. We also checked that the ETMX L1 LOCK L filter bank was set up correctly. Since we were worried about going partially back to ETMX being delicate, we just ran the LOWNOISE_ESD_ETMX state to ramp all the way back to ETMX at once, and that was also successful.
- It turns out that I had forgotten that we'd need to disable the ETMY L3 Length actuation after we were done using it, since ETMY is used as part of our LSC FF actuation path, and that signal is only supposed to go to L2. We had a funny bump in the DARM spectrum, and also some SDF diffs on ETMY that helped us find that easily.
- I have added (but not tested) a few lines in LOWNOISE_ESD_ETMX to reset the ETMY L3 settings to match the Observe.snap SDF, which should also fix the lump from improper feedforwarding.

As of now, the guardian is set to acquire lock still using the nominal ITMX ESD. So, before we ground the ITM ESDs we'll need to modify the weights in the guardian path, to make it so that the nominal path uses the ETMY and not ITMX.

Images attached to this report

H1 General - Comment to IFO unlocked for Maintenance

oli.patane@ligo.org — Tue, 11 Nov 2025 15:30:11 -0800

Author: oli.patane@ligo.org

Report ID: 88064

23:17 UTC back to NLN

23:28 Back into Observing

LHO VE - EY purge air piping replacement complete

travis.sadecki@ligo.org — Tue, 11 Nov 2025 14:01:05 -0800

Author: travis.sadecki@ligo.org

Report ID: 88062

Gerardo, Jordan, Travis

Today, we finished the installation of the replacement purge air piping at EY. The system still needs to be tested for gross leaks, new filter elements on the supply line installed, an additional support added to the mechanical room side of the purge piping, and the new compressor and purge line validated via FTIR testing. We plan to finish these installations and tests in the next week or two.

H1 General - LVEA Swept

ryan.crouch@ligo.org — Tue, 11 Nov 2025 12:11:28 -0800

Author: ryan.crouch@ligo.org

Report ID: 88061

20:00 UTC I swept the LVEA, I didn't see anything of note.

H1 General - OMC scan with SQZ beam and hot OM2-- 20251111

matthewrichard.todd@ligo.org — Tue, 11 Nov 2025 11:46:42 -0800

Author: matthewrichard.todd@ligo.org

Report ID: 88060

M. Todd, Kar Meng, S. Dwyer

We took more OMC scans today with OM2 hot. We measured a quadratic mismatch of about 6.8%, but the HG10 peak (misalignment) has enough power that I think this could be an underestimate by a percent or so.

We struggled a lot to get good measurements at first, though we followed the directions I wrote last time to the letter. So I'm adding some "bewares" for future reference.

1. The OPO IR locked on 0.2 counts when last time we had a level of around 1 count. We didn't catch this right away but this was essentially locking on a 10 mode and sending that to the OMC and it was giving REALLY strange OMC scans.

2. Once we figured this out, it ensured that we had enough power on the OMC QPDs and the OMA/OMB WFS-DC to get a pretty good centering. Once we ran the OMC scan, we found much better data compared to last week, though we notice here that the 10 peak still has about 50% of the power as the 20 peak (which we're after). This means that the estimate of quadratic mismatch using the P00/(P00+P20+P02) is probably underestimating the mismatch a bit. Note, using the cursors to calculate the power in the peaks means it is just the 00peak/(00peak+20peak) because the power in the 20peak contains both HG20 and HG02 as the OMC has very little astigmatism.

Images attached to this report

LHO VE - Tue CP1 Fill

david.barker@ligo.org — Tue, 11 Nov 2025 11:19:53 -0800

Author: david.barker@ligo.org

Report ID: 88059

Tue Nov 11 10:04:05 2025 INFO: Fill completed in 4min 2secs

Images attached to this report

H1 ISC - IMC PZT Injections -- 2025-11-11

matthewrichard.todd@ligo.org — Tue, 11 Nov 2025 09:32:10 -0800

Author: matthewrichard.todd@ligo.org

Report ID: 88057

M. Todd

Summary: I do not think the ISS is limited by the input jitter (IMC PZT) from 1-1000 Hz. I have attached the injections I've made to the IMC PZT here. Below 1Hz I suspect the ISS is dominated by the IMC motion.

Measurement	Time	File	Notes
PZT PIT -> ISS OUTER RIN [1-15 Hz]	1446913141	/ligo/home/matthewrichard.todd/Projects/imc_injections/dtt_injections/pzt_pit_injection_1_15_Hz.xml	Dotted line is quiet time projection to ISS RIN
PZT YAW -> ISS OUTER RIN [1-15 Hz]	1446913769	/ligo/home/matthewrichard.todd/Projects/imc_injections/dtt_injections/pzt_yaw_injection_1_15_Hz.xml	Dotted line is quiet time projection to ISS RIN
PZT YAW -> ISS OUTER RIN [15-1000 Hz]	1445108720	/ligo/home/matthewrichard.todd/Projects/imc_injections/dtt_injections/pzt_yaw_injection_15_1000_Hz.xml	Dotted line is quiet time projection to ISS RIN
PZT PIT -> ISS OUTER RIN [15-1000 Hz]	1445107725	/ligo/home/matthewrichard.todd/Projects/imc_injections/dtt_injections/pzt_yaw_injection_15_1000_Hz.xml	Dotted line is quiet time projection to ISS RIN

Images attached to this report

H1 General - IFO unlocked for Maintenance

oli.patane@ligo.org — Tue, 11 Nov 2025 08:09:26 -0800

Author: oli.patane@ligo.org

Report ID: 88056

I unlocked the ifo at 2025-11-11 16:03:17 UTC so we could start maintenance Tuesday

Lockloss

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Tue, 11 Nov 2025 07:44:39 -0800

Author: oli.patane@ligo.org

Report ID: 88055

TITLE: 11/11 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 3mph Gusts, 2mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.29 μm/s
QUICK SUMMARY:

Currently Observing and have been Locked for over 11 hours. Today is maintenance day. It's also super foggy outside

H1 AOS - Workstations updated

erik.vonreis@ligo.org — Tue, 11 Nov 2025 03:31:15 -0800

Author: erik.vonreis@ligo.org

Report ID: 88054

Workstations were updated and rebooted. This was an os packages update. Conda packages were not updated.

H1 General - Monday Ops Eve shift report

anthony.sanchez@ligo.org — Mon, 10 Nov 2025 22:03:58 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88053

TITLE: 11/11 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 6mph Gusts, 3mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.29 μm/s
SHIFT SUMMARY:
After a lockloss early tonight relocking was simple after an Iniital_Alignement.
H1 has been locked for 1.5 hours. everything seems like it should be running well for the rest of the night.

LOG:
No log.

H1 General - Lockloss From NLN

anthony.sanchez@ligo.org — Mon, 10 Nov 2025 21:21:07 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88052

02:44:29 Lockloss
ETMX_L3 Master out looks to have had a glitch about 300 ms before hand and then was the first channel to deviate at 146ms before the lockloss.
Obligitory Lockloss ndscopes attached.

Lockloss

Images attached to this report

H1 General - Monday OPS Eve shift report.

anthony.sanchez@ligo.org — Mon, 10 Nov 2025 16:45:20 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88051

TITLE: 11/11 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 5mph Gusts, 2mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.30 μm/s
QUICK SUMMARY:
H1 has been locked and Observing for 5.5 hours.
Violins, secondary microseism & the wind forecast are all looking great!
The range seems to have settled down too.
Looks to be a great night for Observing.

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Mon, 10 Nov 2025 16:32:58 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88050

TITLE: 11/11 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 19:45 UTC (but locked at 19:09).

Very well behaved IFO today with short reacquisition. Wind is still low and microseism continues to fall.

Had one LL during commissioning (lockloss alog 88043)

OFI temp is stepping once an hour for the next 4ish hours - should not interfere with relocking or anything, Alog 88046.

Additionally, there was a power glitch (not on-site but in town) that flickered lights and caused IY to saturate until power came back a few ms later. Alog 88049.

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:43	FAC	Kim	Optics Lab	N	Technical Cleaning	15:56
15:44	FAC	Randy	MY to EY	N	Caulking joints on beam tube	22:43
16:07	FAC	Nellie	MY	N	Technical Cleaning	17:16
16:07	FAC	Kim	MX	N	Technical Cleaning	16:54
18:26	FAC	Kim	H2	N	Technical cleaning	18:34
18:44		Kar Meng	Optics Lab	Local	Looking for optics + maybe turning on laser	20:01
21:01	FAC	Joel, Tyler, Richard	Overpass	N	BTE Look-at with contractor	21:55
21:01	FAC	Ken	EX	N	Conduit work	01:01
21:40	SUS	Rahul	Optics Lab	N	First contact on JM optics	22:11
21:55		Kar Meng	Optics Lab	Local	Looking for optics + maybe turning on laser	23:17

H1 PEM - Power Glitch 23:52:19 UTC

ibrahim.abouelfettouh@ligo.org — Mon, 10 Nov 2025 16:27:20 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88049

Ibrahim, Ryan S, Tony

H1 saw a power glitch after lights flickered (Ryan S noticed NUC21 flickered) and IY SUS saturated. Dave confirms GC UPS saw the glitch.

Power has gone out (temporarily?) in-town according to friends.

Plots attached.

CDS

Images attached to this report

H1 DetChar - Coincident Narrow Lines at 2048 and 4096 Hz in H1 and L1

xuanye.fan@ligo.org — Mon, 10 Nov 2025 15:53:33 -0800

Author: xuanye.fan@ligo.org

Report ID: 88048

I noticed that in the high-frequency spectra (2000–5000 Hz) of both detectors from O4a data, there are spectral lines exactly at 2048 and 4096 Hz. They are so narrow that only the power at the exact frequency bins of 2048 Hz and 4096 Hz is significantly elevated.

This might be due to artifacts from the data-acquisition process. I searched the aLOGs for H1 and L1 but haven’t found relevant entries. Does anyone know the origin of these two lines?

Images attached to this report

X1 SUS - Comment to Characterization of Optics (JM - 1, 2 & 3) for Jitter Attenuation Cavity (JAC) for O-5

rahul.kumar@ligo.org — Mon, 10 Nov 2025 14:50:28 -0800

Author: rahul.kumar@ligo.org

Report ID: 88047

The HR and AR side of all three optics were cleaned using First Contact - see picture attached for reference.

Images attached to this report

H1 IOO - OFI temperature stepping in observing

sheila.dwyer@ligo.org — Mon, 10 Nov 2025 14:09:46 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88046

Tony, Ibrahim, Sheila

While we are observing, the OFI temperature will be stepped once an hour for the next 7 hours. I wouldn't expect this to impact the IFO or noise much, but tagging Detcahr just in case.

The script is running on cdsws39, I'll leave the terminal open on the 1st workspace. I'm hoping to get 7 hours of data from this with the IFO locked, but if the IFO unlocks this script shouldn't interfere with relocking so it can just be left running.

DetChar

H1 TCS - Comment to Estimating surface defocus of test masses and absorption from HOM spacing

vladimir.bossilkov@ligo.org — Mon, 10 Nov 2025 13:03:41 -0800

Author: vladimir.bossilkov@ligo.org

Report ID: 88045

Reassuringly, this lines up well with TCS calibration of ringheater on surface deformation [T1400685].

H1 ISC - Quick PR3/SR3 sensing at ports

elenna.capote@ligo.org — Mon, 10 Nov 2025 11:53:35 -0800

Author: elenna.capote@ligo.org

Report ID: 88044

Here is how the PR3 and SR3 signals show up at various ports.

I drove a pitch line from PR3 M3 and SR3 M3 at 8.125 Hz with the ASC notches on. I was able to see at signal with a 10 ct drive on PR3 pitch and 60 ct drive on SR3 pitch.

Templates saved as {PR3,SR3}_M3_injection_all_ports.xml in /ligo/home/elenna.capote/POPX_test in case the data is useful to you.

PR3 appears strongly at REFL and POP in I and at AS in Q. SR3 appears strongly at AS in Q and POP in Q.

Will try to repeat for yaw.

Images attached to this report

H1 General - Lockloss 17:14 UTC

ibrahim.abouelfettouh@ligo.org — Mon, 10 Nov 2025 11:26:49 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88043

Lockloss during commissioning (though not due to commissioning). Lockloss Tool

No immediately obvious cause other than first kicks being EX Osems ~86ms pre-lockloss. DARM IN1 also saw a kick ~-92ms (attached)

Images attached to this report

X1 SUS - Characterization of Optics (JM - 1, 2 & 3) for Jitter Attenuation Cavity (JAC) for O-5

rahul.kumar@ligo.org — Mon, 10 Nov 2025 11:16:00 -0800

Author: rahul.kumar@ligo.org

Report ID: 88040

Keita, Rahul

We received three mirrors (JM1, 2 and 3) for the Jitter Attenuation Cavity (JAC) from CIT and were asked to characterize these mirrors before installing them in HAM1 chamber for the upcoming vent at LHO. JM1 and JM3 optics will be used in Tip Tilt supension and JM2 optic will be on a fixed mount inside the HAM1 chamber. Given below are the details of our setup and the results after characterizing them in the optics lab.

Aim of the experiment:- (a) to measure the reflectivity of the three mirrors as a function of its Angle Of Incidence (AOI) for P polarization of the input beam (1064nm laser), (b) measure the transmission of the optics at its AOI (defined in T2400360).

Experimental setup in Optics lab:- The optical layout is shown in figure1. We used a 1W 1064 nm laser (the power was reduced to 15mW approximately using a half wave plate). A polarizing beamsplitter was used to transmit P polarization waves to the steering mirror and the S polarization waves were reflected towards beam dump. The steering mirror used over here is dichroic (reflecting 1064nm light and transmitting/rejecting spurious green light emerging from the laser towards the beam dump). We used two lens to focus the input beam - one located upstream of the steering mirror and another one downstream of the same. The optic was installed on a Siskiyou mount, which was placed on a rotational stage - as shown in the picture. Thorlabs Power meter was used to measure the input, output and transmitted beam.

Results:-

We did coarse and fine measurement to characterize the mirrors. For coarse measurement, we started at zero degree AOI (when the input beam was reflected back towards the iris) and then rotated the optic until the output power nulled - while recording the reflected power at every 5 degree interval.

Optic	Input beam power (mW)	AOI from T2400360 (degree)	Measured AOI for 99% reflectivity (degree)	Notes
JM 3 - E1900393_V1_02 s/n 09	15	5.07	zero to 35 degrees	reflected power dropped to less than 5mW at and above 40 degree AOI (null at 50deg)
JM 2- E1900393_V1_02 s/n 10	15	9.77	zero to 35 degree	reflected power dropped to less than 5mW at and above 40 degree AOI (null at 50 deg)
JM1 - E1900393_V1_02 s/n 16	15	45	zero to 65 degrees	reflected power dropped to less than 3mW at and above 70 degree AOI

For fine measurements we set each optic at its AOI (as defined in T2400360) and then carefully measured the input, output and transmitted power. The results are given below,

Optic	AOI degree	Power, Input beam	Power, reflected beam	Power, transmitted beam
JM 3 - E1900393_V1_02 s/n 09	5.07	15.0mW	15.0mW	1.38uW
JM 2- E1900393_V1_02 s/n 10	9.77	14.9mW	15.0mW	1.37uW
JM1 - E1900393_V1_02 s/n 16	45	15.1mW	15.0mW	2.84uW

Conclusions - Coarse measurement shows that JM2 and JM3 optic has over 99% reflectivity from zero to 35deg, for JM1 it is from zero to 65 deg. Fine measurements of all 3 optics shows that transmission is around 0.01 - 0.02%, and 99.99% (99.98% for JM1)reflectivity at its respective AOI.

SUS

Images attached to this report

H1 CDS - Comment to 4K ethernet testing moved to EX

ezekiel.dohmen@ligo.org — Mon, 10 Nov 2025 10:47:41 -0800

Author: ezekiel.dohmen@ligo.org

Report ID: 88042

After ~1 week, no long RTTs, and no NIC reported error counters of any type (Attached is one sides output).

Non-image files attached to this report

H1_Long_Range_Fiber_Testing.txt

H1 PSL - PSL 10-Day Trends

ryan.short@ligo.org — Mon, 10 Nov 2025 10:32:12 -0800

Author: ryan.short@ligo.org

Report ID: 88041

FAMIS 31111

I adjusted the ISS refsignal last Tuesday to bring the diffracted power back up to around 4%, which is clearly seen in the stabilization trends in a reduction in PMC transmitted power. No other major events of note this week.

Images attached to this report

H1 SQZ - start of sqz dataset with FC detuning at 3kHz

sheila.dwyer@ligo.org — Mon, 10 Nov 2025 09:22:32 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88039

started with running scan alignment and scan SQZ ANG. Moved filter cavity detuning to 3100 Hz

	UTC time	start gps time	RF6 phase (really RF3)
SQZ (ref0)	16:45 16:50 UTC	1446828330	192.2
mid sqz - (ref1)	16:53:30 - 16:57:30	1446828830	241
a sqz (ref2)	17:05 -17:09 30	1446829499	237.1 (CLF +)

Lockloss while tuning phase for the other mid sqz, we don't have a no sqz referecnce for this data set. If someone wants to try to salvage this, a recent no sqz time is here.

Images attached to this report

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Mon, 10 Nov 2025 07:31:41 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88038

TITLE: 11/10 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.34 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 10:07 UTC (5 hr lock)

Wind is good. Microseism is still very (very) slowly coming down.

We have planned comissioning from 8:30 and 11:30 AM PT Today.

H1 DetChar - Data Quality Shift Report: LHO 2025-11-03 to 2025-11-09

jossian.garcia@ligo.org — Mon, 10 Nov 2025 07:02:57 -0800

Author: jossian.garcia@ligo.org

Report ID: 88036

Link to report here.

Observing performance:
H1 achieved an average observing duty cycle of 48.77% for the week. Operations started with several issues but showed a notable recovery toward the weekend, reaching 87.1% on Saturday and Sunday.
Environmental disturbances:
The main causes of lock losses were earthquake-band and wind-band motion. Three significant seismic events were recorded: a magnitude 6.0 earthquake in Russia on Tuesday, 6.6 in Japan on Sunday, and 5.7 in Mexico on Friday. Additionally, there was considerable microseismic activity throughout the week.
Spectral features:
Persistent violin modes were observed, particularly the fundamental around 500 Hz.
Notable noise events:
Tuesday exhibited multiple BNS range drops and broadband noise excess across all frequencies starting around 10 UTC. Probably related with ETMX violin mode ring-up which caused excess noise in DARM, leading to lock loss. This day also registered the highest line count of the week, reaching approximately 5000.
Detchar tab:
Hveto pages were not generated for the last three days of the week.
FSCAN plots reported the lowest line count on Friday (~1900 lines) and the highest on Tuesday (~5000 lines) above treshold.
Relevant Round Winners:
- No winners in monday, but H1:LSC-POP_A_LF_OUT_DQ repeated 3rd place in the past 7 days.
- Tuesday: H1:SUS-ETMX_L3_OPLEV_PIT_OUT_DQ top 1 for second time in 7 days.

H1 DetChar - DQ Shift report for the week from 2025-10-13 to 2025-10-19

sreedevimohan.s@ligo.org — Mon, 10 Nov 2025 03:09:03 -0800

Author: sreedevimohan.s@ligo.org

Report ID: 88034

Below is the summary of the DQ shift for the week from 2025-10-13 to 2025-10-19

The average range was 150 Mpc during the first few days, and later it improved to 155 Mpc.
Glitchgram and glitch rate were normal and comparable to the previous day, with a few exceptions.
Some low-frequency features were visible in the strain spectrogram throughout the week.
Earthquake band and wind band motion were the main reasons for lock loss most of the time.
Hveto pages were not created for the last three days of the week.
Fscan- for the whole week, the line count was below the threshold.
The Interactive spectrum is not created throughout the week.

The full DQ shift report with day-by-day details and plots is available here.

DetChar

H1 General - Sunday Ops Eve shift report

anthony.sanchez@ligo.org — Sun, 09 Nov 2025 22:11:07 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88031

TITLE: 11/10 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
INCOMING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 5mph Gusts, 3mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.35 μm/s
SHIFT SUMMARY:
H1 Has been locked all night, for 16.5 hours now.
Everything seems to be running very smoothly. Violins looking Fantastic!
Wind forecast is perfect for observing throughout the night.
And the Secondary microseism is on the way down.

LOG:
No Log

H1 CDS - Inspect quarterly trends of HWWD bits for indication of negative function

anthony.sanchez@ligo.org — Sun, 09 Nov 2025 22:02:43 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88030

Famis 27546 Inspect quarterly trends of HWWD bits for indication of negative function.

I believe I'm just looking for channels that have no bit switching (motion) on them, which would indicate that the HWWD is no longer working properly.

First image is how the trends display on the ndscope, it's a bit hard to see all of the channels here.
But in the second image I just scaled the channels by enough to see that there is motion on all 4 channels.
ETMX HWWD apparently has the least amount of HWWD bit switching action, but there are bits being switched.
But ETMY has been a bit busy switching bits!

CDS

Images attached to this report

H1 TCS - Comment to Estimating surface defocus of test masses and absorption from HOM spacing

matthewrichard.todd@ligo.org — Sun, 09 Nov 2025 21:48:55 -0800

Author: matthewrichard.todd@ligo.org

Report ID: 88029

I've attached the plot using all the data collected to make a fit for the ring heater impact on surface defocus of the End Test Mass. Note, the definition of the coupling factor in this plot is half of the convention used in most documents (i.e. 1/R = 1/Rcold + B*Prh)

Images attached to this report

H1 General - Comment to Sunday Ops Eve Shift report.

anthony.sanchez@ligo.org — Sun, 09 Nov 2025 18:51:27 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88028

Running the OFI Temp Stepper script.
I wasn't sure how long to run it for, so I just ran it for 1 hour.

anthony.sanchez@cdsws25: python OFI_temp_stepper.py --duration 1 -s 1446773500
Waiting for start time...
starting temp setting: 35.0
H1:IOO-OFI_TEC_SETTEMP => 32
H1:IOO-OFI_TEC_SETTEMP => 29
H1:IOO-OFI_TEC_SETTEMP => 26
H1:IOO-OFI_TEC_SETTEMP => 23
H1:IOO-OFI_TEC_SETTEMP => 20
H1:IOO-OFI_TEC_SETTEMP => 37
H1:IOO-OFI_TEC_SETTEMP => 39
H1:IOO-OFI_TEC_SETTEMP => 35.0
done!

SQZ

H1 General - Sunday Ops Eve Shift report.

anthony.sanchez@ligo.org — Sun, 09 Nov 2025 17:09:30 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88027

TITLE: 11/10 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 0mph Gusts, 0mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.36 μm/s
QUICK SUMMARY:
H1 Has been locked for 11 hours.
Everything here looks good.... Range is on the lower side.
I'm about to run Sheila's script to change the OFI Temp since we have had a few locks that have been above 10 hours already.
Will report back.

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Sun, 09 Nov 2025 16:28:46 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88026

TITLE: 11/10 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 13:27 UTC (11 hr lock)

Microseism is very (very) slowly trending down. Wind looks good.

Only thing of note is that Cal Inj EY (H1:CAL-INJ_CW_OUTPUT) turned off for 3 minutes, which dropped us out of observing for that time (19:17 UTC to 19:30 UTC). It came back autoamtically. I found another instance of this happening in August - Ryan C's alog 86399. Tagging CAL, Tagging CDS.

LOG:

None

CAL, CDS

Images attached to this report

H1 SEI - SEI seismometer mass check - Monthly FAMIS

ibrahim.abouelfettouh@ligo.org — Sun, 09 Nov 2025 13:22:49 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88025

Closes FAMIS 27509, last checked in alog 87296

Similar results to last week with 12 T240 masses out of range compared to last month's 13. Same results for STS.

Averaging Mass Centering channels for 10 [sec] ...
2025-11-09 13:18:07.263464

There are 12 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 2 DOF X/U = -1.566 [V]
ETMX T240 2 DOF Y/V = -1.576 [V]
ETMX T240 2 DOF Z/W = -0.951 [V]
ITMX T240 1 DOF X/U = -2.22 [V]
ITMX T240 1 DOF Z/W = 0.466 [V]
ITMX T240 3 DOF X/U = -2.34 [V]
ITMY T240 3 DOF X/U = -1.07 [V]
ITMY T240 3 DOF Z/W = -2.835 [V]
BS T240 1 DOF Y/V = -0.353 [V]
BS T240 3 DOF Z/W = -0.431 [V]
HAM8 1 DOF Y/V = -0.453 [V]
HAM8 1 DOF Z/W = -0.761 [V]

All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = -0.034 [V]
ETMX T240 1 DOF Y/V = -0.086 [V]
ETMX T240 1 DOF Z/W = -0.1 [V]
ETMX T240 3 DOF X/U = -0.076 [V]
ETMX T240 3 DOF Y/V = -0.11 [V]
ETMX T240 3 DOF Z/W = -0.091 [V]
ETMY T240 1 DOF X/U = -0.014 [V]
ETMY T240 1 DOF Y/V = 0.16 [V]
ETMY T240 1 DOF Z/W = 0.21 [V]
ETMY T240 2 DOF X/U = -0.092 [V]
ETMY T240 2 DOF Y/V = 0.195 [V]
ETMY T240 2 DOF Z/W = 0.002 [V]
ETMY T240 3 DOF X/U = 0.224 [V]
ETMY T240 3 DOF Y/V = 0.012 [V]
ETMY T240 3 DOF Z/W = 0.116 [V]
ITMX T240 1 DOF Y/V = 0.26 [V]
ITMX T240 2 DOF X/U = 0.16 [V]
ITMX T240 2 DOF Y/V = 0.256 [V]
ITMX T240 2 DOF Z/W = 0.217 [V]
ITMX T240 3 DOF Y/V = 0.098 [V]
ITMX T240 3 DOF Z/W = 0.103 [V]
ITMY T240 1 DOF X/U = 0.051 [V]
ITMY T240 1 DOF Y/V = 0.108 [V]
ITMY T240 1 DOF Z/W = -0.026 [V]
ITMY T240 2 DOF X/U = 0.018 [V]
ITMY T240 2 DOF Y/V = 0.216 [V]
ITMY T240 2 DOF Z/W = 0.118 [V]
ITMY T240 3 DOF Y/V = 0.068 [V]
BS T240 1 DOF X/U = -0.106 [V]
BS T240 1 DOF Z/W = 0.149 [V]
BS T240 2 DOF X/U = 0.063 [V]
BS T240 2 DOF Y/V = 0.147 [V]
BS T240 2 DOF Z/W = 0.037 [V]
BS T240 3 DOF X/U = -0.176 [V]
BS T240 3 DOF Y/V = -0.29 [V]
HAM8 1 DOF X/U = -0.23 [V]

Assessment complete.
Averaging Mass Centering channels for 10 [sec] ...

2025-11-09 13:18:19.262567
There are 2 STS proof masses out of range ( > 2.0 [V] )!
STS EY DOF X/U = -4.593 [V]
STS EY DOF Z/W = 2.266 [V]

All other proof masses are within range ( < 2.0 [V] ):
STS A DOF X/U = -0.436 [V]
STS A DOF Y/V = -0.917 [V]
STS A DOF Z/W = -0.49 [V]
STS B DOF X/U = 0.167 [V]
STS B DOF Y/V = 0.938 [V]
STS B DOF Z/W = -0.364 [V]
STS C DOF X/U = -0.708 [V]
STS C DOF Y/V = 0.764 [V]
STS C DOF Z/W = 0.522 [V]
STS EX DOF X/U = -0.201 [V]
STS EX DOF Y/V = -0.136 [V]
STS EX DOF Z/W = 0.122 [V]
STS EY DOF Y/V = 1.246 [V]
STS FC DOF X/U = 0.188 [V]
STS FC DOF Y/V = -1.118 [V]
STS FC DOF Z/W = 0.629 [V]

Assessment complete.

SEI

H1 PSL - PSL Weekly Report - Weekly FAMIS 27538

ibrahim.abouelfettouh@ligo.org — Sun, 09 Nov 2025 13:14:17 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88024

Closes FAMIS 27538, last checked in alog 87902

Laser Status:
NPRO output power is 1.85W
AMP1 output power is 70.63W
AMP2 output power is 139.9W
NPRO watchdog is GREEN
AMP1 watchdog is GREEN
AMP2 watchdog is GREEN
PDWD watchdog is GREEN

PMC:
It has been locked 9 days, 23 hr 29 minutes
Reflected power = 24.68W
Transmitted power = 106.3W
PowerSum = 131.0W

FSS:
It has been locked for 0 days 8 hr and 51 min
TPD[V] = 0.5364V

ISS:
The diffracted power is around 4.2%
Last saturation event was 0 days 8 hours and 53 minutes ago

Possible Issues:
PMC reflected power is high

PSL

LHO VE - Sun CP1 Fill

david.barker@ligo.org — Sun, 09 Nov 2025 10:17:09 -0800

Author: david.barker@ligo.org

Report ID: 88023

Sun Nov 09 10:01:51 2025 INFO: Fill completed in 1min 50secs

Very quick fill today, discharge line pressure was above nominal in the hour preceding the fill.

Images attached to this report

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Sun, 09 Nov 2025 07:36:08 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88022

TITLE: 11/09 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.43 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 13:27 UTC

Wind looks good. Microseism still high.

H1 General - Comment to OPS OWL report

ryan.crouch@ligo.org — Sun, 09 Nov 2025 01:43:42 -0800

Author: ryan.crouch@ligo.org

Report ID: 88021

A 6.4 from the same area came through ~ 40 minutes later. Everythings untripped and looks ok

09:40 UTC I reenabled remote so it can wait out the motion.

H1 General - OPS OWL report

ryan.crouch@ligo.org — Sun, 09 Nov 2025 00:33:43 -0800

Author: ryan.crouch@ligo.org

Report ID: 88020

08:14 UTC lockloss from a 6.6 from Japan,

08:23 ETMY and TMSY SUS and ISI watchdogs tripped.

08:33 UTC ETMY HEPI WD tripped

I untripped SUS, put it in DAMPED, untripped the ISI then lastly the HEPI.

Lockloss

H1 General - Satuerday Eve Shift End

anthony.sanchez@ligo.org — Sat, 08 Nov 2025 22:12:34 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88019

TITLE: 11/09 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
INCOMING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 13mph Gusts, 10mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.51 μm/s
SHIFT SUMMARY:
LHO's IFO H1 has been locked for 14+ hours.
I did drop us from Observing at 5:46 to change a Violin damping setting that was being turned off by the Violin Damping Guardian.
Took the Violin Guardian to Damping on simple. Set the Damping that I wanted for ITMX Mode2: gain to -15, then selected Damping Violins full Power.
Got back to Observing at 5:47 UTC.
This setting seems to work wonderfully! IXm2 is dropping like a rock & the DCPD's are converging nicely.
Wind forcast looks great for the night.

LOG:
No Log

SUS

H1 General - Satuerday Eve Shift Start

anthony.sanchez@ligo.org — Sat, 08 Nov 2025 16:53:34 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88018

TITLE: 11/09 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 13mph Gusts, 9mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.51 μm/s
QUICK SUMMARY:

H1 has been locked for 9+ hours, everything seems to be running well.
Wind forcast looks great as well!

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Sat, 08 Nov 2025 16:30:30 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88017

TITLE: 11/08 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 15:26 UTC (9 hr lock!)

IFO was locked for the entire shift. CAL sweep was done after SE standdown in coordination with LLO (alog 88016)

5 2nd Sat tours went great!

LOG:

None

H1 CAL - Calibration Sweep 11/08

ibrahim.abouelfettouh@ligo.org — Sat, 08 Nov 2025 13:22:36 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88016

Ran a successful coordinated CAL sweep with LLO. We waited ~1hr after the SE standown so sweep was done ~12:15 PM Local

BB Start: 1446668440

BB End: 1446668752

Simulines Start: 1446668866

Simulines End: 1446670223

2025-11-08 20:50:06,504 | INFO | It is SAFE TO RETURN TO OBSERVING now, whilst data is processed.
2025-11-08 20:50:06,504 | INFO | Commencing data processing.
2025-11-08 20:50:06,504 | INFO | Ending lockloss monitor. This is either due to having completed the measurement, and this functionality being terminated; or because the whole process was aborted.
2025-11-08 20:50:42,733 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20251108T202728Z.hdf5
2025-11-08 20:50:42,741 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20251108T202728Z.hdf5
2025-11-08 20:50:42,746 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20251108T202728Z.hdf5
2025-11-08 20:50:42,751 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20251108T202728Z.hdf5
2025-11-08 20:50:42,756 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20251108T202728Z.hdf5
PST: 2025-11-08 12:50:42.885356 PST
UTC: 2025-11-08 20:50:42.885356 UTC
GPS: 1446670260.885356

CAL

Images attached to this report

LHO VE - Sat CP1 Fill

david.barker@ligo.org — Sat, 08 Nov 2025 10:28:08 -0800

Author: david.barker@ligo.org

Report ID: 88015

Sat Nov 08 10:04:31 2025 INFO: Fill completed in 4min 28secs

Images attached to this report

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Sat, 08 Nov 2025 07:50:42 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88014

TITLE: 11/08 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 3mph Gusts, 1mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.43 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 15:26 UTC

Wind is down and microseism looks to be coming down.

Coordinated CAL sweep today at 11:30 with LLO but otherwise plans are to keep observing!

H1 General - Comment to Fridays's Ops Eve Shift End

david.barker@ligo.org — Sat, 08 Nov 2025 07:44:54 -0800

Author: david.barker@ligo.org

Report ID: 88013

MY vac gauge PT243 fired up 16:30 Friday which cleared the CDS ALARMS. I have rescinded the cell phone bypass for this channel.