aLIGO LHO Logbook

H1 SQZ - more overnight scripts running

sheila.dwyer@ligo.org — Sat, 22 Nov 2025 21:43:47 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88208

After Robert stoped for the day, I set up another round of sqz scanning scripts, which should finish in less than 2 hours from now.

I've also modified Kevin's script to allow me to schedule it to start at midnight, and added some lines that will attempt to step down the ITM CO2 powers to 0.9W from 1.7W. This is a repeat of a test we tried a few times in June, we had locklosses that might have been unrelated 85335. If the IFO stays locked for 1 hour after stepping down the CO2s, the script should run the ADF scan again. I didn't test any of my modifications to the script.

Here's the log of times for the first sqz angle scan tonight:

log of times :
nonlinear gain measurement, unamplified seed scan: 1447904771, amplified seed time: 1447904933 nosqz : 1447904755.0

starting angle scan for FIS with zm4 psams at 6.2, zm5 psams at -5.3:

169.8 : 1447906635.0
159.8 : 1447906876.0
149.8 : 1447907115.0
139.8 : 1447907356.0
129.8 : 1447907596.0
119.8 : 1447907836.0
109.8 : 1447908076.0
99.8 : 1447908316.0
89.8 : 1447908556.0
79.8 : 1447908796.0
79.8 : 1447909036.0
59.8 : 1447909276.0
39.8 : 1447909516.0
19.8 : 1447909757.0
0.0 : 1447909997.0
-30.0 : 1447910237.0
-60.0 : 1447910477.0
-90.0 : 1447910717.0
-120.0 : 1447910957.0
-150.0 : 1447911197.0

LHO VE - Sat CP1 fill

david.barker@ligo.org — Sat, 22 Nov 2025 10:22:31 -0800

Author: david.barker@ligo.org

Report ID: 88207

Sat Nov 22 10:03:07 2025 INFO: Fill completed in 3min 5secs

Quick fill, ended when TC-A saw a spurt of LN2 and its delta-T exceeded the trip limit, the full overflow followed shortly after.

Images attached to this report

H1 General - OPS Saturday morning check-in

ryan.crouch@ligo.org — Sat, 22 Nov 2025 07:53:25 -0800

Author: ryan.crouch@ligo.org

Report ID: 88206

STATE of H1: Planned Engineering
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 5mph Gusts, 2mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.40 μm/s
QUICK SUMMARY:

We've been locked for 11:45, Sheila has a SQZ script running which I can see by the SQZ_MANAGER complaining about the ANG_ADJ_SERVO not being on. Secondary microseism is still elevated.

H1 SQZ - SQZ angle scans overnight

sheila.dwyer@ligo.org — Sat, 22 Nov 2025 06:56:02 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88205

The sqz angle scan ran overnight. It did no squeezing and an NLG measurement at the start but those times are not included in the log of times for some reason, I will have to find the times manually.

It looks like the alignment degraded overnight. The script runs AS42 WFS while it moves the psams, but that must not have worked well enough. I'm running scan_alignment: results here, angle scan following here.

It looks like the squeezing angle servo based on the 322 Hz ADF was on while we were in frequency independent squeezing, this will not work well so I've added it SQZ_MANAGER to turn that off when it misaligns the filter cavity.

Ran scan alignment a second time, as well as scan sqz angle, set guardian to FDS, turned off ADF servo and started Kevin's script at 6:55, it should finish around 8:30.

Edited to add: I think the first two scans here are good data, so FDS nominal psams and FIS ZM4 at 4, ZM5 at -0.4. This should also have teh nlg measurement for Kevin's script that I'll have to go find the times for by hand.

log of times :
starting angle scan for FREQ_DEP_SQZ with zm4 psams at 6.2, zm5 psams at -0.4184.8 : 1447823586.0
174.8 : 1447823826.0
164.8 : 1447824067.0
154.8 : 1447824306.0
144.8 : 1447824547.0
134.8 : 1447824787.0
124.8 : 1447825027.0
114.8 : 1447825267.0
104.8 : 1447825507.0
94.8 : 1447825747.0
94.8 : 1447825987.0
74.8 : 1447826227.0
54.8 : 1447826467.0
34.8 : 1447826707.0
14.8 : 1447826948.0
0.0 : 1447827187.0
-30.0 : 1447827428.0
-60.0 : 1447827668.0
-90.0 : 1447827908.0
-120.0 : 1447828148.0
-150.0 : 1447828388.0
starting angle scan for FREQ_INDEP_SQZ with zm4 psams at 4.0, zm5 psams at -0.4182.1 : 1447829109.0
172.1 : 1447829349.0
162.1 : 1447829589.0
152.1 : 1447829829.0
142.1 : 1447830069.0
132.1 : 1447830309.0
122.1 : 1447830549.0
112.1 : 1447830789.0
102.1 : 1447831029.0
92.1 : 1447831269.0
92.1 : 1447831510.0
72.1 : 1447831749.0
52.1 : 1447831990.0
32.1 : 1447832229.0
12.1 : 1447832470.0
0.0 : 1447832710.0
-30.0 : 1447832950.0
-60.0 : 1447833190.0
-90.0 : 1447833430.0
-120.0 : 1447833670.0
-150.0 : 1447833910.0
starting angle scan for FREQ_INDEP_SQZ with zm4 psams at 6.2, zm5 psams at -4.5175.0 : 1447835290.0
165.0 : 1447835530.0
155.0 : 1447835770.0
145.0 : 1447836010.0
135.0 : 1447836250.0
125.0 : 1447836490.0
115.0 : 1447836730.0
105.0 : 1447836970.0
95.0 : 1447837210.0
85.0 : 1447837450.0
84.9 : 1447837690.0
64.9 : 1447837930.0
44.9 : 1447838171.0
24.9 : 1447838410.0
4.9 : 1447838651.0
0.0 : 1447838891.0
-30.0 : 1447839131.0
-60.0 : 1447839371.0
-90.0 : 1447839611.0
-120.0 : 1447839851.0
-150.0 : 1447840092.0
starting angle scan for FREQ_INDEP_SQZ with zm4 psams at 6.2, zm5 psams at -5.3173.6 : 1447840601.0
163.6 : 1447840841.0
153.6 : 1447841081.0
143.6 : 1447841321.0
133.6 : 1447841561.0
123.6 : 1447841801.0
113.6 : 1447842041.0
103.6 : 1447842281.0
93.6 : 1447842521.0
83.6 : 1447842761.0
83.6 : 1447843001.0
63.6 : 1447843242.0
43.6 : 1447843481.0
23.6 : 1447843722.0
3.6 : 1447843962.0
0.0 : 1447844202.0
-30.0 : 1447844442.0
-60.0 : 1447844682.0
-90.0 : 1447844922.0
-120.0 : 1447845162.0
-150.0 : 1447845402.0
starting angle scan for FREQ_INDEP_SQZ with zm4 psams at 6.2, zm5 psams at -0.4183.6 : 1447846542.0
173.6 : 1447846782.0
163.6 : 1447847022.0
153.6 : 1447847263.0
143.6 : 1447847502.0
133.6 : 1447847743.0
123.6 : 1447847983.0
113.6 : 1447848223.0
103.6 : 1447848463.0
93.6 : 1447848703.0
93.6 : 1447848943.0
73.6 : 1447849183.0
53.6 : 1447849423.0
33.6 : 1447849663.0
13.6 : 1447849904.0
0.0 : 1447850143.0
-30.0 : 1447850384.0
-60.0 : 1447850624.0
-90.0 : 1447850864.0
-120.0 : 1447851104.0
-150.0 : 1447851344.0

Got one more scan with good alignment for ZM5 psams at -4.5. There was a no sqz time when the nlg was measured a few minutes before this, but times aren't recorded in the log so I'll have to go find the times later.

starting angle scan for FIS with zm4 psams at 6.2, zm5 psams at -4.5169.4 : 1447867479.0
159.4 : 1447867659.0
149.4 : 1447867839.0
139.4 : 1447868019.0
129.4 : 1447868199.0
119.4 : 1447868379.0
109.4 : 1447868559.0
99.4 : 1447868739.0
89.4 : 1447868919.0
79.4 : 1447869099.0
79.4 : 1447869279.0
59.4 : 1447869459.0
39.4 : 1447869640.0
19.4 : 1447869819.0
0.0 : 1447870000.0
-30.0 : 1447870180.0
-60.0 : 1447870360.0
-90.0 : 1447870540.0
-120.0 : 1447870720.0
-150.0 : 1447870900.0

Images attached to this report

H1 General - Fridays's Ops Eve Shift End

anthony.sanchez@ligo.org — Fri, 21 Nov 2025 22:28:10 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88204

TITLE: 11/22 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
Got H1 relocked at 04:09 UTC.
Sheila is running a script that will take many hours and will wait for the IFO to be relocked.

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
18:18	PEM	Robert, Geneveive	LVEA	n	Moving cable	21:18
22:36	PEM	Robert Sam Genevive	EY & MY	N	Setting up PEM injection?	23:26

H1 General - Fast shutter interlock issue

anthony.sanchez@ligo.org — Fri, 21 Nov 2025 18:12:59 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88202

Ham 6's fast shutter seemed to have an issue.
I noticed on the OPS overview screen that HAM6 fast shutter was bright red.
I checked the details and noticed an Error:
Protection in Fault; Power Interlock is
I took ISC_lock to IDLE.
Went to AS Port Protection screen. I didn't get a screen shot of it but it looked like this screen shot from alog 87915
Got it working again,
The Fast Shutter Guardian was in fault with an init and got back to locking.

ISC

Images attached to this report

H1 General - Friday Ops Eve Shift

anthony.sanchez@ligo.org — Fri, 21 Nov 2025 16:57:28 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88201

TITLE: 11/22 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 6mph Gusts, 3mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.52 μm/s
QUICK SUMMARY:
The IFO is currently unlocked and attempting to lock DRMI. Secondary microseism seems elevated but it's low enough to lock.
Flashes look good.
Pushed to PRMI early. DRMI locked!... Nice.

H1 General - Ops Day Shift End

oli.patane@ligo.org — Fri, 21 Nov 2025 16:45:44 -0800

Author: oli.patane@ligo.org

Report ID: 88200

TITLE: 11/22 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Trying to lock DRMI, and we've been having some issues locking for the past four hours, but I think it might be a combo of the high secondary microseism and a medium sized earthquake that passed through? Hard to tell for sure.
LOG:

15:30UTC Initial alignment running
15:40 Relocking
16:36 NOMINAL_LOW_NOISE
20:51 Lockloss

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
16:33	PEM	Robert	LVEA	n	Checking on equipment	16:40
18:18	PEM	Robert, Geneveive	LVEA	n	Moving cable	21:18
18:47		KarMeng	OpticsLab	y(local)	OPO work	19:09
20:21		Corey	OpticsLab	n	Cleaning optics	23:06
20:48		Sheila, KarMeng	OpticsLab	y(local)	OPO work	21:30
21:58	CDS	Erik	Remote	N	RCG upgrade	22:08
22:36	PEM	Robert Sam Genevive	EY & MY	N	Setting up PEM injection?	23:26
23:25	PCAL	Tony	PCAL Lab	y(local)	Caps on spheres	23:53
00:17	JAC	Jennie	JOAT Lab	n	Just bringing in parts for the table	00:24

Images attached to this report

H1 ISC - Comment to DRMI Inventory log

elenna.capote@ligo.org — Fri, 21 Nov 2025 15:02:55 -0800

Author: elenna.capote@ligo.org

Report ID: 88199

PRMI OLGs

Images attached to this report

H1 PEM - Fixed accelerometers underneath HAM1 + others

samantha.callos@ligo.org — Fri, 21 Nov 2025 12:47:42 -0800

Author: samantha.callos@ligo.org

Report ID: 88094

At some point within the last year, both the X and Y-axis accelerometers (PEM-CS_ACC_LVEAFLOOR_HAM1_X and Y) were kocked off (pictured here) the small metal cube they were mounted to. I reattached them as of Nov 11, 2025. I believe the capacitor position sensor box was pushed back into the accelerometers which knocked them off. Image 3 shows where the CPS box is in relation to HAM1 (circled in red) and image 4 shows where it is in relation to the accelerometers.

Additionally, two other accelerometers have been remounted with epoxy in August: PEM-CS_ACC_BEAMTUBE_SRTUBE_X (remounted August 5, 2025) and PEM-CS_ACC_BEAMTUBE_YMAN_X (remounted August 12, 2025). Both had fallen off the beamtube and had been hanging in the air for an unknown amount of time until someone noticed.

DetChar

Images attached to this report

X1 SUS - Comment to BBSS BRD High-Resolution Measurements

ibrahim.abouelfettouh@ligo.org — Fri, 21 Nov 2025 10:30:20 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 88198

Updated Zoomed BRD measurement with a higher excitation of the bounce mode with BRD installed which shows the characteristic mechanical damping of the BRD (broad peak).

Images attached to this report

LHO VE - Fri CP1 Fill

david.barker@ligo.org — Fri, 21 Nov 2025 10:14:01 -0800

Author: david.barker@ligo.org

Report ID: 88197

Fri Nov 21 10:08:26 2025 INFO: Fill completed in 8min 22secs

Images attached to this report

H1 General - Comment to Ops Day Shift Start

thomas.shaffer@ligo.org — Fri, 21 Nov 2025 09:19:47 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88196

Last night we were stuck at 10W with the IMC unlocked because H1_MANAGER requested ISC_LOCK run an initial alignment while ISC_LOCK was already powering up to 10W to run check MICH. In the DOWN state of ISC_LOCK, it requests LASER_PWR to 2W, BUT ALIGN_IFO repeatedly requests LASER_PWR to 10W while the power is still adjusting. I have no idea why this would be necessary, and Sheila and I agreed that we should take it out. I've removed that portion of code and reloaded that node. If we run into whatever issue someone was trying to fix again, we will come up with a different solution.

H1 CDS - EY CNS-II independent GPS clock misbehaving again.

david.barker@ligo.org — Fri, 21 Nov 2025 09:07:13 -0800

Author: david.barker@ligo.org

Report ID: 88195

Starting at 08:38 PST this morning the 1PPS signal from EY CNS-II clock, as seen by the comparitor, started dropping from is nominal range of -200 to -700 nS.

This had been seen before and was coming and going about every month about a year ago to the point where Erik installed a Rb clock under the computer rack at EY as a second independent clock and ran its 1PPS BNC into the next port on the comparitor, at which point the problem went away for 8 months until today.

The timeline for the past year is:

07dec2024 CNS dropped to -700 for a few hour

16jan2025 ditto

25feb2025 ditto

04mar2025 Rb clock installed

21nov2025 problem reappeared 8 months since last one

The Rb clock signal is a linearly varying time difference and it does not show any jump this morning confirming the CNS-II signal itself is the problem, not the comparitor or the local timing fanout.

In the trend posted CNS-II is BLUE, Rb-clock is ORANGE

Images attached to this report

H1 PSL - PSL Status Report Weekly FAMIS

oli.patane@ligo.org — Fri, 21 Nov 2025 08:11:52 -0800

Author: oli.patane@ligo.org

Report ID: 88194

Closes FAMIS#27540, last checked 88125

Everything is looking good.

Laser Status:
NPRO output power is 1.855W
AMP1 output power is 70.55W
AMP2 output power is 139.7W
NPRO watchdog is GREEN
AMP1 watchdog is GREEN
AMP2 watchdog is GREEN
PDWD watchdog is GREEN

PMC:
It has been locked 21 days, 18 hr 27 minutes
Reflected power = 24.49W
Transmitted power = 106.8W
PowerSum = 131.3W

FSS:
It has been locked for 0 days 0 hr and 40 min
TPD[V] = 0.5491V

ISS:
The diffracted power is around 3.9%
Last saturation event was 0 days 9 hours and 3 minutes ago

Possible Issues:
PMC reflected power is high

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Fri, 21 Nov 2025 07:46:16 -0800

Author: oli.patane@ligo.org

Report ID: 88193

TITLE: 11/21 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 4mph Gusts, 3mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.53 μm/s
QUICK SUMMARY: Just finished an initial alignment and working on getting DRMI. Looks like we have been unlocked for the past 8 hours. We last lost lock at 07:05 UTC, it then tried relocking until at 08:05 UTC it left CHECK_MICH_FRINGES and took itself to DOWN to run an initial alignment. However, it got stuck in READY (probably because the IMC was stuck at 10W), but it stayed there for four hours, then it looks like a couple earthquakes came in so it probably then just stayed there because the ground may have been moving too much. However, it wasn't until TJ fixed the 10W issue that it was able to start an initial alignment at 15:17 UTC. I know we don't have an actual OWL set, but I am surprised it didn't at least say in the log that assistance was required.

LHO General - Comment to Ops Eve Shift Summary

sheila.dwyer@ligo.org — Thu, 20 Nov 2025 22:10:40 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88192

The squeezing angle stepper script is now in /ligo/gitcommon/squeezing/sqzutils/automate_dataset/

I've set it to go taking the longer data sets overnight tonight. I modified the script this morning to check that the IFO is locked and thermalized before it starts, which is working with some debugging from Ryan and TJ during breaks in the PEM work today. It doesn't handle locklosses part way through the data set well, there are places where it will wait for the squeezing manager to go to the requested state and get hung up there if the IFO is unlocked.

I've set up the first script (SQZ_ANG_stepper.py) to start with no squeezing time, and scan the demod phase for FDS with nominal psams(6.2V ZM4, -0.4V ZM5), then move ZM4 to 4 V and scan with FIS, this is going now.

I've also set up a second script to start again at 1:30 pacific, this should only start if we are locked for at least an hour at that time. This one will scan FIS for two different values of ZM5 psams, and if all goes well will finish around 4 am.

Edit: this didn't complete because the IFO unlocked, I've stopped both scripts now. This is what the log says:

log of times :
starting angle scan for FREQ_DEP_SQZ with zm4 psams at 6.2, zm5 psams at -0.4176.2 : 1447740288.0
166.2 : 1447740528.0
156.2 : 1447740768.0
146.2 : 1447741008.0
136.2 : 1447741248.0
126.2 : 1447741489.0
116.2 : 1447741728.0
106.2 : 1447741969.0
96.2 : 1447742209.0
86.2 : 1447742449.0
86.1 : 1447742689.0
66.1 : 1447742929.0
46.1 : 1447743169.0
26.1 : 1447743409.0
6.1 : 1447743649.0
0.0 : 1447743889.0
-30.0 : 1447744129.0
-60.0 : 1447744370.0
-90.0 : 1447744609.0
-120.0 : 1447744849.0
-150.0 : 1447745090.0

H1:SQZ-CLF_REFL_RF6_PHASE_PHASEDEG => 156.17385
H1:GRD-SQZ_ANG_ADJUST_REQUEST => ADJUST_SQZ_ANG_ADF
log of times :
starting angle scan for FREQ_DEP_SQZ with zm4 psams at 6.2, zm5 psams at -0.4176.2 : 1447740288.0
166.2 : 1447740528.0
156.2 : 1447740768.0
146.2 : 1447741008.0
136.2 : 1447741248.0
126.2 : 1447741489.0
116.2 : 1447741728.0
106.2 : 1447741969.0
96.2 : 1447742209.0
86.2 : 1447742449.0
86.1 : 1447742689.0
66.1 : 1447742929.0
46.1 : 1447743169.0
26.1 : 1447743409.0
6.1 : 1447743649.0
0.0 : 1447743889.0
-30.0 : 1447744129.0
-60.0 : 1447744370.0
-90.0 : 1447744609.0
-120.0 : 1447744849.0
-150.0 : 1447745090.0

H1:GRD-SQZ_MANAGER_REQUEST => FREQ_INDEP_SQZ

LHO General - Ops Eve Shift Summary

ryan.short@ligo.org — Thu, 20 Nov 2025 21:06:37 -0800

Author: ryan.short@ligo.org

Report ID: 88191

TITLE: 11/21 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: PEM measurements were going well until a lockloss @ 01:27 UTC; PEM team was out in the LVEA at the time but were not doing anything particularly noisy. Ran an initial alignment then started relocking, but had a lockloss for some reason in LOWNOISE_ESD_ETMY; this didn't happen on the second relock attempt.

After relocking, I started testing Sheila's SQZ angle stepper script to make sure it's okay to run automatically tonight, but I ran into a few issues, so at this point it is not set to run overnight. After the last test run I did of the script, I accidentally just reverted the ZM4 PSAMs voltage from 15.2 back to its nominal 6.7 (I know now this is MUCH too quick of a change and could have caused a lockloss), so squeezing doesn't look great. Even still, H1 is observing and is set to relock automatically as usual overnight.

LOG:

01:27 - Lockloss from NLN
- Ran initial alignment
02:47 - Lockloss in LOWNOISE_ESD_ETMY
03:51 - NLN

LHO General - Ops Eve Shift Start

ryan.short@ligo.org — Thu, 20 Nov 2025 15:56:18 -0800

Author: ryan.short@ligo.org

Report ID: 88190

TITLE: 11/20 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 13mph Gusts, 10mph 3min avg
Primary useism: 0.05 μm/s
Secondary useism: 0.55 μm/s
QUICK SUMMARY: H1 has been locked for 14 hours and PEM measurements continue with other opportunistic tests happening in between.

Wind low, microseism on the rise and currently around 90th percentile
All other systems nominal

H1 ISC - Comment to new version of noise budget code: WIP

alexandra.mitchell@ligo.org — Thu, 20 Nov 2025 15:34:12 -0800

Author: alexandra.mitchell@ligo.org

Report ID: 88189

We used the simplenb code to make a plot for the the Stanford seismic NSF proposal, I've attached it below for reference. Some things which we found along the way getting this to run properly as someone offsite who doesn't have a lot of experience with cds * We struggled with LFS and eventually manually downloaded the files needed, we couldn't get them to download via git for some reason * superQK environment is a branch of pygwinc https://git.ligo.org/gwinc/pygwinc * The aligoNB repo is also needed * If working offsite some lines in excess_power_utils under def import_dtt_calib should be edited to the correct directory Hope this is useful for anyone trying to do the same offsite!

Non-image files attached to this report

noisebudegt_brian5.pdf

LHO General - Ops Day Shift End

thomas.shaffer@ligo.org — Thu, 20 Nov 2025 15:27:11 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88188

TITLE: 11/20 Day Shift: 1530-2330 UTC (0730-1530 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Locked for 13.5 hours. PEM characterization continues. The useism has been on the rise the last few hours.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:47	FAC	Nellie	Opt lab	n	Tech clean	16:09
15:48	FAC	Randy	Yarm	n	Y1 beam tube sealing	23:01
18:45	FAC	Kim, Nellie	OSB	n	Rolling up roll up door	19:05
18:50	PEM	Robert, Genevieve	LVEA	n	Move the speaker cable	19:27
19:30	PEM	Robert, Genevieve	LVEA	n	Readjusting the shaker rod	19:43
20:05	IO	Corey	Opt Lab	n	JAC optics cleaning	22:05
21:05	PEM	Robert, Genevieve, Carlos	LVEA	N	Moving shaker to BSC3	21:29
21:22	SQZ	Sheila, Kar Meng	Opt Lab	LOCAL	OPO testing	21:50
21:24	CDS	Marc	MY	n	Grabbing parts	23:22
22:51	SUS	Oli	CER	n	Writing down a number	22:55
23:05	PEM	Robert, Genevieve, Sam	LVEA	n	Look at and alter the shaker	23:13
23:23	SQZ	Sheila, Kar Meng	Opt Lab	-	Looking for tool pan in area past card reader, then going to optics lab for more OPO work	01:23

LHO VE - Thu CP1 Fill

david.barker@ligo.org — Thu, 20 Nov 2025 10:17:59 -0800

Author: david.barker@ligo.org

Report ID: 88187

Thu Nov 20 10:09:15 2025 INFO: Fill completed in 9min 11secs

Images attached to this report

LHO General - Comment to Ops Day Shift Start

thomas.shaffer@ligo.org — Thu, 20 Nov 2025 09:01:32 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88186

I ended up doing these things:

Cycling SQZ_MANAGER Down and back. Same results
Setting SQZ_OPO_LR to Scan_OPOTEMP
Adjusting the SHG rejected fiber power with the half and quarter wave plates, but I wasn't sure that I was actually making anything better. While I was reducing the SQZ-SHG_FIBR_REJECTED_DC_POWERMON from 0.75 down to near 0.1 (the guardian notification says it should be around 0.035), the H1:SQZ-SHG_REJECTED_DC_POWERMON was still drifting away at the same rate. I ended up reverting these changes.
At this point the only SQZ guardian notification was the SQZ_LO saying that their might be a misalignment issue since there was no 3MHz a the OMC. Sheila walked in and moved ZM4 and ZM6 back to a time when we had a better sqz lock. This went away.
Squeezing still looks back, but Sheila says the angle is bad and it might have to do with her script from last night. She touched that up and we were back.

LHO General - Comment to Ops Day Shift Start

thomas.shaffer@ligo.org — Thu, 20 Nov 2025 07:56:23 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88185

Notifications from the SQZ suite of guardians:

SQZ_MANAGER - request Reset_SQZ_ASC_FDS

SQZ_OPO_LR - "pump fiber rej power in ham7 high, nominal 35e-3, align fiber pol on sqzt0."

SQZ_LO_LR - "LOW OMC_RF3 power < -22! Align SQZ-OMC_RF3, or more CLF power if aligned."

This seems like a similar situation as alog87361

LHO General - Ops Day Shift Start

thomas.shaffer@ligo.org — Thu, 20 Nov 2025 07:30:55 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88184

TITLE: 11/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 6mph Gusts, 4mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.30 μm/s
QUICK SUMMARY: Locked for 6 hours but it looks like the squeezer has an issue. Working on it now. Dust alarm in the diode room, but other than that, no alarms overnight.

H1 PEM - Comment to Magnetic Injection Suite Started

ryan.short@ligo.org — Thu, 20 Nov 2025 00:06:01 -0800

Author: ryan.short@ligo.org

Report ID: 88183

Injection suite finished at 08:00 UTC and H1 returned to observing.

H1 PEM - Magnetic Injection Suite Started

ryan.short@ligo.org — Wed, 19 Nov 2025 21:53:22 -0800

Author: ryan.short@ligo.org

Report ID: 88182

Since I saw H1 was locked, I started the full magnetic injection suite (49 injections total over the 7 coils across site) at 05:40 UTC using the PEM_MAG_INJ Guardian. This dropped H1 out of observing, but it should return to observing once the injections finish. The suite will finish in roughly 2 hours or if the IFO loses lock, whichever comes first. I'll check things later tonight in case this poses any issues.

LHO General - Comment to Ops Eve Shift Summary

sheila.dwyer@ligo.org — Wed, 19 Nov 2025 21:08:54 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88181

IFO locked and was in NLN, but not observing, because I'd left a pico controller enabled and it was causing an SDF diff. I disabled it and now we are in observing.

LHO General - Ops Eve Shift Summary

ryan.short@ligo.org — Wed, 19 Nov 2025 20:10:29 -0800

Author: ryan.short@ligo.org

Report ID: 88180

TITLE: 11/20 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: PEM measurements were running smoothly until a lockloss @ 01:28 UTC. Since H1 is having a bit of trouble getting relocked (locklosses during LASER_NOISE_SUPPRESSION and DRMI) for reasons I'm unsure of, I've set things to run overnight the same as last night, with H1_MANAGER attempting to keep H1 up but not call for help. I've also set Sheila's SQZ angle stepper script to start at 09:00 UTC (01:00am PST) running on cdsws39 with the hope that H1 is locked.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
01:13	CAL	Tony	PCal Lab	N	Changing spheres	01:21
01:40	PEM	Robert, Sam, Genevieve	EX -> LVEA	N	Moving shaker	02:50
02:12	VAC	Gerardo	LVEA	N	Checking AIP controller	03:02

LHO General - Ops Eve Shift Start

ryan.short@ligo.org — Wed, 19 Nov 2025 16:40:29 -0800

Author: ryan.short@ligo.org

Report ID: 88179

TITLE: 11/20 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 9mph Gusts, 6mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.33 μm/s
QUICK SUMMARY: H1 has been locked for about 30 minutes and PEM measurements are ongoing.

Wind is low, microseism slowly dropping and below the 90th percentile
All other systems nominal

LHO General - Ops Day Shift End

thomas.shaffer@ligo.org — Wed, 19 Nov 2025 16:28:59 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88178

TITLE: 11/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Currently at low noise, PEM characterization all day and one SQZ measurement started. There was one lock loss during the shift caused by us trying to move the corner station sensor correction off while in lock to allow Robert and a UW visitor look at the ITMY seismometer. Didn't work. Relocking was an initial alignment and then waiting at DRMI while we still had SC off, but all auto.
LOG:

2206 Lock loss - we tried to turn off sensor correction in a way that would allow Robert and a UW visitor to access the bier garten seismometer.
2357 Nominal low noise

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
16:25	PEM	Robert, Sam, Genevieve	CR/LVEA	n	PEM measurements, in and out of the LVEA all day	22:05
17:07	FAC	Kim, Nellie	OSB	n	Opening receiving roll up door	17:22
17:48	PEM	Robert, Sam	EX	n	Setup measurement	19:33
19:34	SEI	Richard, UW	desert	n	Checking on the vault seismometers	20:25
19:42	SYS	Betsy	Opt Lab	n	Check on lab	19:47
20:22	IO	Corey	Prep lab	n	JAC table enclosure	22:58
20:57	SQZ	Sheila	CR	n	SQZ meas.	22:07
21:40	VAC	Travis	EY	n	Check in mech room	22:04
21:56	SQZ	Sheila, Kar Meng	Opt Lab	n	OPO unboxing	23:00
22:04	PEM	Sam, Genevieve, Jennie	LVEA	n	Move speaker	22:40
22:06	PEM	Robert, UW Paul	LVEA	n	Look at seismometer	23:21
22:13	PEM	Richard	LVEA	n	Join Robert and Paul	22:39
23:22	pem	Robert, Sam, Genevieve	EX	n	Set up shaker	00:11

H1 DAQ - WP 12886 continued, work on h1daqdc0

jonathan.hanks@ligo.org — Wed, 19 Nov 2025 14:47:50 -0800

Author: jonathan.hanks@ligo.org

Report ID: 88177

Jonathan and Yuri

This is a continuation of WP 12886. This is the last physical step in the control room/MSR for the reconfiguration. We ran a fiber from the warehouse patch pannel to h1daqdc0 and replaced the network card with a newer card. We will be renaming h1daqdc0, likely to h1daqkc0 (daqd kafka connector), and converting it to send the IFO data into the LDAS as part of the NGDD project.

Next steps on this work is to work on the software setup, and to install the corresponding fiber patch in the LDAS room.

H1 ISC - Checking LSC and ASC safe SDFs

elenna.capote@ligo.org — Wed, 19 Nov 2025 14:22:13 -0800

Author: elenna.capote@ligo.org

Report ID: 88176

Checking the safe SDF settings for the LSC and ASC model.

ASC model not monitored channels here. No outstanding SDF diffs while unlocked

LSC model not monitored channels here. Also no outstanding SDF diffs while unlocked.

ASCIMC has no unmonitored channels. No safe diffs with IFO unlocked.

Images attached to this report

H1 PEM - New dust monitor Huddle Test results

ryan.crouch@ligo.org — Wed, 19 Nov 2025 13:18:12 -0800

Author: ryan.crouch@ligo.org

Report ID: 88174

I've ran a few different huddle test with the new TemTop dust monitors against 3 different MetOne GT521s. The first tests I ran in the Optics lab and Diode room showed some discrepancies between the spike times but that could be due to a difference in sample times vs the two dust monitors. The PMS21 and GT521s both sample for 60 seconds then hold for 300s, but the PMD331 does not have a built in hold time so it samples continuously or manually. The PMS21 usually reads an order of magnitude or two lower than the other two which makes me wonder if it needs a scale factor, but it also sees these big spikes occasionally that the others don't see which is confusing. The flow rate is listed as being 0.1 CFM on the PMS21, but the GT521s and the PMD331 are also listed as having flow rates of 0.1 CFM. CFM = Cubic feet / minute, its also = 2.83 L/min which is what I read when running the flow test on all of the DMs. *Also the times do not account for daylight savings, so each y-axis timestamp is actually an hour behind the actual PST*.

Test 1 - Optics Lab:

I tested the TemTops one at a time in the Optics lab, the results of the PMD331 and the results of the PMS21.

Test 2 - Diode Room:

I tested the TemTops at the same time in the Diode room, I started off with only the PMS21 then I added the PMD331. For only the PMS21 we saw the these counts, for only the PMD331 we saw these counts, and for both of them we saw these counts,all against a MetOne GT521s.

Test 3 - Control Room:

I tested three dust monitors at the same time in the control room ( I grabbed a spare pumped GT521s from the storage racks by the OSB receiving, it's our last properly working spare). I did a day of samples with holds enabled and a day of continuous sampling. When the dust monitors were sampling at slightly different intervals we saw the peaks offset from each other such as at 11-18 ~07:00 PST at the right of the plot. During the continuous testing we can see the peaks from everyone coming into the control room for the end of O4 celebration, I'm not sure why there's some time between the peaks, zooming in on this plot to cut out the large peaks from said celebration we can see the PMD331 and the MetOne GT521s following each other pretty closely, but the PMS21 wasn't really reading much, there are small bumps around where the peaks from the other DMs are. Adding a scale factor of 10 to the PMS21 counts yield a better looking plot, playing with the scale factor till the PMS21 counts looked more in-line with the other DMs I got to a scale factor of 40 to get this plot.

Images attached to this report

H1 SQZ - FDS SQZ angle scan data set

sheila.dwyer@ligo.org — Wed, 19 Nov 2025 13:08:03 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88175

In breaks in the PEM work this morning I improved the script I used last night so that I don't have to do as many things by hand. The script is in sheila.dwyer/SQZ/automate_dataset/SQZ_ANG_stepper.py, I'll try to clean it up a bit more and add to userapps soon.

It's running now and will take 5 minutes of no sqz time, and do the steps needed to measure nonlinear gain (it doesn't give a result, but some times that can be looked at later). Then it takes some angle steps in 10 degree steps on the steep side of the elipse and 30 degree steps on the slow side of the elipse (where SQZ angle changes slowly with demod angle).

This current version should take 1 hour to take 3 minutes of data at each point, or 1.5 hours for 4 minutes of data.

It's now running for FDS with nominal psams settings, this can be aborted if PEM wants to do injections before it's over.

LHO VE - Wed CP1 Fill

david.barker@ligo.org — Wed, 19 Nov 2025 10:39:21 -0800

Author: david.barker@ligo.org

Report ID: 88173

Wed Nov 19 10:09:29 2025 INFO: Fill completed in 9min 25secs

Images attached to this report

LHO General - Comment to Ops Day Shift Start

david.barker@ligo.org — Wed, 19 Nov 2025 09:34:32 -0800

Author: david.barker@ligo.org

Report ID: 88172

Because the CDS WIFIs will always be on from now onwards, I've accepted these settings into the CDS SDF

H1 CDS - h1tcshwssdf restarted to remove duplicate channels

david.barker@ligo.org — Wed, 19 Nov 2025 09:20:21 -0800

Author: david.barker@ligo.org

Report ID: 88171

FRS36084 Dave, TJ:

TJ discovered that some HWS SLED settings were being monitored by multiple slow-SDF systems (h1syscstcssdf and h1tcshwssdf). The former's monitor.req is computer generated, the later's is hand built.

There were 4 duplicated channels: H1:TCS-ITM[X,Y]_HWS_SLEDSET[CURRENT,TEMPERATURE]

I removed these channels from tcs/h1/burtfiles/h1tcshwssdf_[monitor.req, safe.snap, OBSERVE.snap] and restarted the psudo-frontend h1tcshwssdf on h1ecatmon0 at 09:00 Wed 19nov2025 PST. The number of monitored channels dropped from 64 to 60 as expected.

I did a full scan of all the monitor.req files and confirmed that there were only these 4 channels duplicated.

I'll add a check to cds_report.py to look for future duplications.

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

jason.oberling@ligo.org — Wed, 19 Nov 2025 09:14:29 -0800

Author: jason.oberling@ligo.org

Report ID: 88170

Slight correction to the above. The autolocker did not get stuck between states 2 and 3, as there is no path from state 3 to state 2 in the code. What's happening is the autolocker goes into state 4, detects an oscillation, then immediately jumps back to state 2; so this is a loop from states 2 -> 3 -> 4 -> 2 due to the oscillation and the inability of the autolocker gain ramp to effectively clear it. This happens at the clock speed of the FSS FE computer, while the channel that monitors the autolocker state is only a 16 Hz channel. So the monitor channel is no where close to fast enough to see all of the state changes the code is going through during an oscillation.

H1 SEI - Comment to BRSY not damping like it should, bypassed, not used for now

thomas.shaffer@ligo.org — Wed, 19 Nov 2025 09:06:08 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88169

I've accepted these thresholds in SDF since it seems that this is the new normal.

Images attached to this report

LHO General - Ops Day Shift Start

thomas.shaffer@ligo.org — Wed, 19 Nov 2025 07:36:54 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88168

TITLE: 11/19 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 3mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.39 μm/s
QUICK SUMMARY: Locked for 13 hours, but it looks like we just got into observing 45min ago due to an SDF diff. Lights are on at MY, Y_BT AIP still in error as mentioned in Ryan's log. Plan for to day is to continue PEM characterization.

H1 SQZ - sqz data set FIS, nominal psams, script left running

sheila.dwyer@ligo.org — Wed, 19 Nov 2025 06:49:30 -0800

Author: sheila.dwyer@ligo.org

Report ID: 88167

unamplified seed: 0.0055 amplified seed: 0.052, deamplified: 0.00073 NLG = 9.45, seems too small

no sqz: 1447564297 - 1447565492
reduced seed, adjusted temp: amplified max:0.00547 minimum 8.3e-5, unamplified: 2.54e-4 NLG 21.5

FIS, ran scan sqz angle kHz, CLF 6 demod phase left at 149.7 degrees. 1447566037

I started the script to scan squeezing angles with FIS, Ryan Short gave me a pointer on how to have my script change guardian states (puts SQZ ANGLE SERVO to IDLE now). It is set up to try the current angle +/-10 degrees, run through a bunch of angles in 20 degree steps, flip the CLF sign and run through angles again. When finished it should request frequency dependent squeezing again and Ryan has set things up so the IFO should go to observing when that happens.

The script ran anf completed, the IFO didn't go to observing when it completed because I forgot to turn off the pico controler after I lowered the seed. Here is the log of times:

log of changes :
149.7 : 1447566755.0
159.7 : 1447566995.0
139.7 : 1447567235.0
200.0 : 1447567475.0
180.0 : 1447567715.0
160.0 : 1447567956.0
140.0 : 1447568195.0
120.0 : 1447568436.0
100.0 : 1447568676.0
80.0 : 1447568916.0
60.0 : 1447569156.0
40.0 : 1447569396.0
20.0 : 1447569636.0
0.0 : 1447569876.0
180.0 : 1447570116.0
160.0 : 1447570356.0
140.0 : 1447570596.0
120.0 : 1447570837.0
100.0 : 1447571076.0
80.0 : 1447571317.0
60.0 : 1447571557.0
40.0 : 1447571797.0
20.0 : 1447572037.0
0.0 : 1447572277.0

Images attached to this report

LHO General - Ops Eve Shift Summary

ryan.short@ligo.org — Tue, 18 Nov 2025 21:59:24 -0800

Author: ryan.short@ligo.org

Report ID: 88166

TITLE: 11/19 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

H1 had a lockloss from an unknown source early on in my shift, but after an alignment, relocking went easily. Since then, I've been tuning magnetic injection parameters to be used later this week. Also had an alarm for an annulus ion pump at the Y-arm BTM, so I phoned Travis as I was unsure how critical this was. He took a look into it and believes addressing this can wait until morning.

I've set the remote owl operator so that H1 will relock overnight if it unlocks for some reason so that it's ready to go in the morning, but no calls will be made for help. H1 will also start observing, if it can, on the off-chance there's a potential candidate signal.

Sheila has started a script to change the SQZ angle while in frequency independent squeezing, which should take about 90 minutes and will put settings back to nominal when done, at which point H1 should go into observing.

00:39 - Lockloss
01:23 - Running initial alignment
02:31 - Low Noise

H1 DAQ - WP 12886 Reconfigure daqd systems on the DAQD 0 leg for ECR E2500314

jonathan.hanks@ligo.org — Tue, 18 Nov 2025 17:48:15 -0800

Author: jonathan.hanks@ligo.org

Report ID: 88165

Jonathan, Dave, Erik, Richard,

As per WP 12886 we reconfigured the DAQD 0 computers. The goal was to combine the functionality of the data concentrator (DC0) and frame writer (FW0) into one machine, consolidating them to one machine. This then frees up the other machine for use with pushing data into the NGDD (Next Generation Data Delivery) kafka brokers in LDAS.

At this point h1daqdc0 is no longer the data concentrator. H1daqfw0 is the data concentrator + frame writer.

This required a few other changes:

Moved h1daqfw2's data feed from h1daqnds0 to h1daqnds1
Moved a connection between h1daqfw0 and ldasgw0 (to mount the raw minute trends) to h1daqtw0.
- This was used to backup trends to their archive location, it also just makes more sense to have this on h1daqtw0.
- Installed a NIC in h1daqtw0 as we were out of ports.

Once this work was done and h1daqfw2 was shown to be producing identical frames to h1daqfw[01] work was able to move onto the consolidation.

The basic steps:

Turn off the rts-transport services on DC0 (dix_xmit, cps_xmit, cps_recv)
Turn off the rts-transport services on FW0 (dix_recv)
Reconfigure the networking on FW0 to receive the FE DAQ data stream
- We had some problems and ended up replacing the optic and the NIC in the FW machine. We had gotten data flowing, but the frames were not identical. After some investigation it was found that we were dropping data from the FE systems. This was traced to errors on the interface. Erik and Richard cleaned the optics, that didn't help much. We replaced the optic, that helped, but we still had errors. Then we replaced the NIC with one of the new NICs we had on hand and the errors went away.
- If this had happened on DC0 it would have been easy to spot as we would have seen that as CRC errors on the main display. But FW0 doesn't have those up.
Reconfigure the networking on FW0 to send data to TW0
Reconfigure TW0 to run cps_recv to be the data concentrator
Reconfigure TWo to run cps_xmit (for TW0) and dix_xmit (for the rest of the daqd system)
Make sure everything is working

the H1:DAQ-DC0 epics variables are used in many places, so Dave and Jonathan configured h1daqfw0 to output H1:DAQ-DC0 epics variables, and put a small IOC together to output the set of H1:DAQ-FW0 variables we need. This is an area we need to revisit. One likely approach is to make use of a feature in cps_recv that outputs the daqd STATUS, CRC_CPS, CRC_SUM variables and then to move the daqd on FW0 back to outputing the FW0 variables.

This work validates that we can combine the DC and FW computers into one.

The next step is to turn the old DC machine into the producer for NGDD data. We will run the fiber to connect it through to LDAS later this week and work on setting that system up.

My checklist for this is in the DCC https://dcc.ligo.org/T2500385

LHO General - Ops Eve Shift Start

ryan.short@ligo.org — Tue, 18 Nov 2025 15:46:39 -0800

Author: ryan.short@ligo.org

Report ID: 88164

TITLE: 11/18 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 13mph Gusts, 9mph 3min avg
Primary useism: 0.06 μm/s
Secondary useism: 0.47 μm/s
QUICK SUMMARY: H1 has been locked for almost 2 hours and team PEM is running measurements.

Wind low, microseism steady right around 90th percentile
FW0 is still down due to ongoing CDS work
All other systems nominal

LHO General - Ops Day Shift End

thomas.shaffer@ligo.org — Tue, 18 Nov 2025 15:42:21 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88152

TITLE: 11/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Happy end to O4! After 4 hours of maintenance today, we relocked mostly automatic with one hiccup in the SQZ_FC guardian that was using a DC0 GPS channel that temporarily didn't exists due to the 0-leg data concentrator work that is still on going. We have been locked for almost 2 hours now and the PEM team is at work running end of run characterization.
LOG:

1547 Lock loss - SUS charge swapping to ITMX
1601 Norco at gate, headed to EY
1600 O4C complete
1616 h1guardian1 reboot
1620 Norco at the gate, headed to MY
- This truck broke down and the trailer has been left at MY, truck has been towed away
2200 Low noise, PEM inj. starting

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:37	FAC	Randy	Yarm	n	BTE sealing MY -> CS	22:54
16:00	VAC	Norco	EY	n	LN2 fill	18:51
16:20	VAC	Norco	MY	n	LN2 fill CP3 - fill complete	20:46
16:20	FAC	Erik	EX	n	Glycol inspect	16:45
16:34	CDS	Fil	LVEA	n	JAC cable pull from CER to HAM1	20:01
16:35	SUS	Ryan C	CR/EY/EX	n	SUS oplev charge meas.	18:51
16:36	FAC	Tyler	CS, Mids	n	3IFO checks	18:06
16:39	VAC	Travis, Jordan	EY	n	Purge air line work	18:32
16:43	VAC	Gerardo	CS	n	Run purge air	19:16
16:47	FAC	Nellie, Kim	LVEA	n	Tech clean	18:12
16:54	CDS	Marc	LVEA	n	Joining Fil in the cable pulling	20:04
17:19	PEM	Robert, Sam, Genevieve	LVEA	n	Move a shaker	18:49
17:43	CDS	Richard	LVEA	n	Check on the HAM1 cable pull	18:05
17:47	PROP	Christina	EY	n	Check at EY	18:17
18:04	VAC	Travis, Gerardo	EX	n	Turning on compressor	19:20
18:12	FAC	Nellie	EY	n	Tech clean	19:12
18:12	FAC	Kim	EX	n	Tech clean	19:53
18:50	PEM	Sam	LVEA	n	Taking pictures	18:59
19:31	FAC	Kim	FCES	n	Tech clean	20:00
19:32	VAC	Travis	EX	n	Turn compressor off	19:51
19:49	PSL	Jason	CR	n	Ref cav tweak	20:00
20:01	PEM	Robert	LVEA	n	Setup meas.	20:46
20:16	SUS	Oli	CR	n	IFO quiet time	20:27
20:16	PEM	Ryan S	CR	n	PEM mag inj	22:05
20:28	PEM	Sam	LVEA	n	More pictures	20:31
21:04	ISC	Daniel	CER	n	Picture	21:08

H1 DetChar - Data Quality Shift Report 2025-11-10 to 2025-11-10

emmanuelalejandro.avila@ligo.org — Tue, 18 Nov 2025 15:31:51 -0800

Author: emmanuelalejandro.avila@ligo.org

Report ID: 88163

Link to report here.

Summary:

H1 had an average observing duty cycle of 50.37% for the week.
Week started with good conditions for observation, except for some seismic activity which started with an earthquake (Monday)
Strong winds and increasing microseismic noise provoked one day (Friday) of 0% of observation and a lot of glitches the rest of the days .
On Saturday the observation resumed until the end of the week.
For the observing days (Monday, Tuesday, Wednesday, part of Saturday and Sunday), strong winds (still) and high microseismic noise caused locklosses.
We observed persistent violin modes (specifically fundamental at ~500Hz) following lock-losses all week. Weak Bounce/Rolls were not observed.
FScan Plots were available for all the days except Friday. Lowest line count on Thursdat with ~1000 lines and highest on Wednesday with ~3000 lines.
Relevant Round Winners (Hveto only worked on Wednesday, Thursday and Sunday):
- - H1:PSL-ISS_PDA_REL_OUT_DQ: Winner once (Wednesday).
  - H1:ASC-DHARD_P_OUT_DQ: Winner once (Thursday).
  - H1:LSC-PRCL_IN1_DQ: Winner once (Sunday).

DetChar

H1 IOO - JAC electronics chassis

daniel.sigg@ligo.org — Tue, 18 Nov 2025 12:38:49 -0800

Author: daniel.sigg@ligo.org

Report ID: 88162

We started installing electronics chassis for JAC:

Heater driver, S2500960.
DB9 breakout panel, S2500958.
PZT driver, S2500954.
RF doubler: S2500737.
RF amp: S1000637 (was already installed).
Two sat amps for JM1 and JM3, S1106042 and S2500411.

Still missing:

Two 4-chn WFS demod chassis.
Two AA chassis.
JAC in-vacuum electronics interface chassis.

The necessary coax cables were also installed and terminated where possible.

H1 PSL - PSL FSS RefCav Remote Beam Alignment Tweak

jason.oberling@ligo.org — Tue, 18 Nov 2025 11:59:02 -0800

Author: jason.oberling@ligo.org

Report ID: 88161

The RefCav Refl spot was off this morning and the TPD had been trending down the last several days, so I took the opportunity to tweak the beam alignment into it from the Control Room. The ISS was ON for this work.

When I started the RefCav TPD was ~0.520 V and when I finished the TPD was ~0.548 V. I then noticed the ISS was diffracting ~4.5%, which is higher than its norm, so I adjusted the ISS RefSignal to -2.01 V from -2.00 V. This brought the diffracted power % down to around its normal value of ~4%. At this diffraction % the RefCav TPD is now ~0.550 V and the PMC Trans is now ~106.9 W.

H1 SUS - OPLEV charge measurements, ETMX, ETMY

ryan.crouch@ligo.org — Tue, 18 Nov 2025 11:00:15 -0800

Author: ryan.crouch@ligo.org

Report ID: 88157

I took the OPLEV charge measurements for both the ends this morning. I noticed that both of the scripts leave the L3 bias offset switch off when its should be on.

I ran into the same issue as had previously with ETMX constantly saturating no matter what amplitude I used. Jeff suggested I look at the biases and see if they're correct, the biases used for ETMX were [-9, -4, 0, 4, 9] and I changed them to [-8. -4. 0. 4. 8] in ESD_Night_ETMX.py which stopped the overflows. The L3 bias offset on ETMX is -8.9 while we're DOWN, as soon as the bias is changed to -9 I started seeing overflows. Before I changed the bias offset I was trying some different amplitudes and I was getting overflows at what looked like ~10/15k/sec for everything, i ctrl+ced out a measurement and saw that the overflows did not stop, which lead me to chech the L3 bias offset where had not correctly restored it to -8.9 as its supposed to. After changing the L3 bias offset list in the measurement code I then had to fine tune the amplitude after starting low. Amplitudes of 10000, 12000, and 20000 weren't enough, I ended up at 100,000 which gave me the best measurement I've seen in months. LR did still have some big error bars, the charge is high on LR, and UR but looks low at UL and LL, and the recent trend actually looks to be decreasing, looking at the year long trend it actually looks fairly stable considering the massive error bars on a lot of the measurements. Every quadrant is under + 100 [V].

ETMY also initially had some saturations but reducing the gain by 20% stopped them and still yielded good coherence. ETMY's charge is slightly high, it's just under + 100 [V] on 2/3 of the quadrants, UR is the only quadrant below +/- 50 [V], it has risen since May, but zooming out to the whole year it doesn't look to have much of a trend, May wasn't a great measurement.

SUS

Images attached to this report

H1 ISC - Summary Table of OMC Scan and Gouy Phase measurements

matthewrichard.todd@ligo.org — Tue, 18 Nov 2025 10:58:07 -0800

Author: matthewrichard.todd@ligo.org

Report ID: 88155

M. Todd, J. Wright, S. Dwyer

Here is my attempt to summarize as many of the OMC scan measurements of the input beam overlap with the OMC mode, as well as PRC and SRC gouy phases -- all at different thermal states.

Measurement	Time	Test Masses	CO2 [W]	Ring Heater (per segment) [W]	SR3 [W]	OM2 [W]	FOM	aLOG
OMC Scan - Single Bounce off of ITMY	1443895154	Cold	0	0	0	0	Mismatch = 8.3%	87461
OMC Scan - Single Bounce off of ITMX	1443894875	Cold	0	0.45	0	0	Mismatch = 10.4%	87461
OMC Scan - Single Bounce off of ITMY	1443889943	Cold	1.7	0	0	0	Mismatch = 10.3%	87461
OMC Scan - Single Bounce off of ITMX	1443894875	Cold	1.7	0.45	0	0	Mismatch = 13.5%	87461
OMC Scan - Single Bounce off of ITMY	1431450536	Cold	0	0	5	0	Mismatch = 7.6%	85661
OMC Scan - Single Bounce off of ITMY	1403543046	Cold	0	0	0	4.6	Mismatch = 6.6%	78701
OMC Scan - Single Bounce off of ITMX	1431449762	Cold	0	0.45	5	0	Mismatch = 9.6%	85661
OMC Scan - Single Bounce off of ITMY	1431474471	Cold	0	0	5	4.6	Mismatch = 3.1%	85698
OMC Scan - Single Bounce off of ITMX	1431474101	Cold	0	0.45	5	4.6	Mismatch = 5.1%	85698
OMC Scan - Single Bounce off of ITMY	1444515634	Hot-ish	1.7	0	0	0	Mismatch = 7.1%	87461
OMC Scan - Single Bounce off of ITMX	1444515312	Hot-ish	1.7	0.45	0	0	Mismatch = 8.9%	87461
OMC Scan - SQZ Beam	1446952255	-	-	-	-	4.6	Mismatch = 6.8%	88060
OMC Scan - SQZ Beam	1447088389	-	-	-	-	0	Mismatch = 2.8%	88088
Gouy Phase - PRC	1255227492	Cold	ITMY = 0.9, ITMX = 0.8	ITMY = 1.4, ITMX = 0.5	0	0	OneWay Gouy Phase = 23.2 [deg]	52504
Gouy Phase - PRC	1354415805	Cold	0	0	0	0	OneWay Gouy Phase = 20.7 [deg]	66215
Gouy Phase - SRC	1354410195	Cold	0	0	0	0	OneWay Gouy Phase = 19.9 [deg]	66211
Gouy Phase - SRC	1255907203	Cold	ITMY = 0.9, ITMX = 0.8	ITMY = 1.4, ITMX = 0.5	0	0	OneWay Gouy Phase = 25.5 [deg]	52658
Gouy Phase - SRC	1255829128	Cold	ITMY = 0.9, ITMX = 0.8	ITMY = 1.4, ITMX = 0.5	4	0	OneWay Gouy Phase = 29 [deg]	52641

LHO General - Comment to Ops Day Shift Start

david.barker@ligo.org — Tue, 18 Nov 2025 10:42:52 -0800

Author: david.barker@ligo.org

Report ID: 88160

VACSTAT is currently in the "NOT OK" condition due to missing DC0. I'll upgrade it later when Jonathan gets identical frames on the frame writers.

LHO General - Comment to Ops Day Shift Start

david.barker@ligo.org — Tue, 18 Nov 2025 10:41:27 -0800

Author: david.barker@ligo.org

Report ID: 88159

DC0 is down now as part of the DAQ 0-leg upgrade. Its GPS EPICS channels was being used by many systems on the CDS Overview MEDM screen, resulting in a lot of purple boxes. I've switch these over to DC1 and restarted the nuc20 FOM. If you have purple boxes on your CDS Overviews, please restart them.

LHO VE - Tue CP1 Fill

david.barker@ligo.org — Tue, 18 Nov 2025 10:31:00 -0800

Author: david.barker@ligo.org

Report ID: 88158

Tue Nov 18 10:11:33 2025 INFO: Fill completed in 11min 30secs

Images attached to this report

LHO General - Comment to Ops Day Shift Start

david.barker@ligo.org — Tue, 18 Nov 2025 09:38:39 -0800

Author: david.barker@ligo.org

Report ID: 88156

I have updated the "o4" program for end of run.

O4 started: 2023-05-24 08:00:00.000000 PDT [1368975618]
O4 ended: 2025-11-18 08:00:00.000000 PST [1447516818]
now: 2025-11-18 09:36:41.000000 PST [1447522619]

O4A_START: 2023-05-24 08:00:00.000000 PDT [1368975618]
O4A_END: 2024-01-16 08:00:00.000000 PST [1389456018]
O4B_START: 2024-04-10 08:00:00.000000 PDT [1396796418]
O4B_VENT_START: 2024-07-17 11:52:00.000000 PDT [1405277538]
O4B_VENT_END: 2024-08-12 12:37:00.000000 PDT [1407526638]
O4B_END: 2025-04-01 08:00:00.000000 PDT [1427554818]
O4C_STARTGPS: 2025-06-11 08:00:00.000000 PDT [1433689218]
O4_END: 2025-11-18 08:00:00.000000 PST [1447516818]

LHO FMCS - Checking HVAC Fans

anthony.sanchez@ligo.org — Tue, 18 Nov 2025 09:02:42 -0800

Author: anthony.sanchez@ligo.org

Report ID: 88154

Famis 27573 Vibration Sensors To Gauge Health Of HVAC Fans Site

H0:VAC-MR_FAN6_170_1_ACC_INCHSEC seem to be going up in that few days especially the last 24 hours.
This is also the case for H0:VAC-MY_FAN2_270_2_ACC_INCHSEC in the last day saw a fairly large increase in noise.

PEM

Images attached to this report

H1 CDS - h1guardian1 machine rebooted

thomas.shaffer@ligo.org — Tue, 18 Nov 2025 08:24:58 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88153

1616UTC rebooted the h1guardian1 machine. This was originally to switch over nds1, but Erik informed me that we had already done this some time ago. Since we already had a WP in and this seemed like a good time to do it, I went for a reboot anyway.

All nodes came back up on their own, no issues seen.

LHO General - Ops Day Shift Start

thomas.shaffer@ligo.org — Tue, 18 Nov 2025 07:32:46 -0800

Author: thomas.shaffer@ligo.org

Report ID: 88151

TITLE: 11/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Calibration
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.46 μm/s
QUICK SUMMARY: Locked for 22 hours, SUS charge and PEM mag. injections running now. Maintenance today, then PEM measurements for the rest of the week, because....

aLIGO LHO Logbook

H1 SQZ - more overnight scripts running

LHO VE - Sat CP1 fill

H1 General - OPS Saturday morning check-in

H1 SQZ - SQZ angle scans overnight

H1 General - Fridays's Ops Eve Shift End

H1 General - Fast shutter interlock issue

H1 General - Friday Ops Eve Shift

H1 General - Ops Day Shift End

H1 ISC - Comment to DRMI Inventory log

H1 PEM - Fixed accelerometers underneath HAM1 + others

X1 SUS - Comment to BBSS BRD High-Resolution Measurements

LHO VE - Fri CP1 Fill

H1 General - Comment to Ops Day Shift Start

H1 CDS - EY CNS-II independent GPS clock misbehaving again.

H1 PSL - PSL Status Report Weekly FAMIS

H1 General - Ops Day Shift Start

LHO General - Comment to Ops Eve Shift Summary

LHO General - Ops Eve Shift Summary

LHO General - Ops Eve Shift Start

H1 ISC - Comment to new version of noise budget code: WIP

LHO General - Ops Day Shift End

LHO VE - Thu CP1 Fill

LHO General - Comment to Ops Day Shift Start

LHO General - Comment to Ops Day Shift Start

LHO General - Ops Day Shift Start

H1 PEM - Comment to Magnetic Injection Suite Started

H1 PEM - Magnetic Injection Suite Started

LHO General - Comment to Ops Eve Shift Summary

LHO General - Ops Eve Shift Summary

LHO General - Ops Eve Shift Start

LHO General - Ops Day Shift End

H1 DAQ - WP 12886 continued, work on h1daqdc0

H1 ISC - Checking LSC and ASC safe SDFs

H1 PEM - New dust monitor Huddle Test results

H1 SQZ - FDS SQZ angle scan data set

LHO VE - Wed CP1 Fill

LHO General - Comment to Ops Day Shift Start

H1 CDS - h1tcshwssdf restarted to remove duplicate channels

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

H1 SEI - Comment to BRSY not damping like it should, bypassed, not used for now

LHO General - Ops Day Shift Start

H1 SQZ - sqz data set FIS, nominal psams, script left running

LHO General - Ops Eve Shift Summary

H1 DAQ - WP 12886 Reconfigure daqd systems on the DAQD 0 leg for ECR E2500314

LHO General - Ops Eve Shift Start

LHO General - Ops Day Shift End

H1 DetChar - Data Quality Shift Report 2025-11-10 to 2025-11-10

H1 IOO - JAC electronics chassis

H1 PSL - PSL FSS RefCav Remote Beam Alignment Tweak

H1 SUS - OPLEV charge measurements, ETMX, ETMY

H1 ISC - Summary Table of OMC Scan and Gouy Phase measurements

LHO General - Comment to Ops Day Shift Start

LHO General - Comment to Ops Day Shift Start

LHO VE - Tue CP1 Fill

LHO General - Comment to Ops Day Shift Start

LHO FMCS - Checking HVAC Fans

H1 CDS - h1guardian1 machine rebooted

LHO General - Ops Day Shift Start

O4C will end in 30 minutes. What a great run! Well done everyone!!