aLIGO LHO Logbook

H1 General - Comment to OPS Sunday DAY shift start

ryan.crouch@ligo.org — Sun, 30 Mar 2025 11:16:44 -0700

Author: ryan.crouch@ligo.org

Report ID: 83644

18:16 UTC Observing

LHO VE - Sun CP1 Fill

david.barker@ligo.org — Sun, 30 Mar 2025 10:20:14 -0700

Author: david.barker@ligo.org

Report ID: 83643

Sun Mar 30 10:11:04 2025 INFO: Fill completed in 11min 1secs

TC-B slightly noisy.

Images attached to this report

H1 General - OPS Sunday DAY shift start

ryan.crouch@ligo.org — Sun, 30 Mar 2025 07:30:01 -0700

Author: ryan.crouch@ligo.org

Report ID: 83641

TITLE: 03/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Earthquake
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: EARTHQUAKE
    Wind: 8mph Gusts, 5mph 3min avg
    Primary useism: 0.51 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

12:31 UTC lockloss (EQ)
We're currently down from a 7.0 from Tonga, probably another two or three hours till the ground motion subsides enough for locking
SUS OPO and FC2 were tripped along with HAMs 2,3,4,5,7,8's ISIs

LHO General - Sat EVE Ops Summary

corey.gray@ligo.org — Sat, 29 Mar 2025 21:59:37 -0700

Author: corey.gray@ligo.org

Report ID: 83639

TITLE: 03/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

Quiet shift with H1 locked the whole time (currently at about 7.5hrs). Squeezed in a successful Calibration while L1 was down. Secondary microseism continues downward trend from the last 24+hrs (touching 50th percentile line). Winds touched ~20mph, but have mostly meen much calmer.
LOG:

0127-0157 Saturday Calibration measurement

H1 CAL - Saturday H1 Calibration Measurement (broadband headless + simulines)

corey.gray@ligo.org — Sat, 29 Mar 2025 18:58:23 -0700

Author: corey.gray@ligo.org

Report ID: 83640

After noticing that L1 was down, started running Calibration measurments since H1 was now thermalized.

Measurement NOTES:

Following instructions (link)
H1 at NLN for for over 3hrs54min
Calibration_Monitor medm screenshot is attached
0127- 0157utc Out of Observing for CALIBRATION
Broadband measurement started at 1427333255
- Measurement at: /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20250330T012727Z.xml
Simullines measurement
- gps START time: 1427333622.245412
- gps STOP time: 1427335020.945731
- File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20250330T013325Z.hdf5
- File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20250330T013325Z.hdf5
- File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20250330T013325Z.hdf5
- File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20250330T013325Z.hdf5
- File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20250330T013325Z.hdf5
Then ISC_LOCK was taken back to NLN for observing

CAL

Images attached to this report

LHO General - Sat EVE Ops Transition

corey.gray@ligo.org — Sat, 29 Mar 2025 16:23:12 -0700

Author: corey.gray@ligo.org

Report ID: 83638

TITLE: 03/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 7mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.19 μm/s
QUICK SUMMARY:

Ryan C handed over an Observing H1. Have had (5) locklosses from Observing over last 24hrs with only 2 of those from last night being due to wind (winds are much lower this evening and secondary µseism continues to plummet).

Perhaps if L1/V1 go down any time after an hr from now (after 3hr thermalization), I could take the opportunity to run a calibration.

H1 General - OPS Saturday day shift summary

ryan.crouch@ligo.org — Sat, 29 Mar 2025 16:01:55 -0700

Author: ryan.crouch@ligo.org

Report ID: 83634

TITLE: 03/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: I was able to get a coherence measurement during the first lock. We've relocked 3 times this shift, no issues relocking.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
18:50	EPO	Janos	Overpass, Yarm	N	Tour	19:46

I've been damping ITMY modes 5/6 with half the nominal gain (0.005) during the second/third lock as I wasn't totally convinced the damping was going well before with the higher gain. 3/4 monitors were going down but the DARM line height on DTT wasn't really changing. TJ said he had success with this lower gain the other day as well. I put the new damping settings for ETMY mode1 into lscparams.

14:17 UTC observing
- 18:12 UTC lockloss
19:29 UTC observing
- 20:22 UTC lockloss, DARM wiggle before the LL?
21:36 UTC observing

Images attached to this report

H1 General - Comment to 20:22 UTC lockloss

ryan.crouch@ligo.org — Sat, 29 Mar 2025 14:40:17 -0700

Author: ryan.crouch@ligo.org

Report ID: 83637

21:36 UTC observing

H1 General - 20:22 UTC lockloss

ryan.crouch@ligo.org — Sat, 29 Mar 2025 13:24:41 -0700

Author: ryan.crouch@ligo.org

Report ID: 83636

20:22 UTC lockloss

Lockloss

H1 General - Comment to 18:13 UTC lockloss (4 hour lock)

ryan.crouch@ligo.org — Sat, 29 Mar 2025 12:29:52 -0700

Author: ryan.crouch@ligo.org

Report ID: 83635

19:29 UTC observing

H1 General - 18:13 UTC lockloss (4 hour lock)

ryan.crouch@ligo.org — Sat, 29 Mar 2025 11:14:32 -0700

Author: ryan.crouch@ligo.org

Report ID: 83633

18:13 UTC lockloss right before the scheduled calibration suite, sad

Lockloss

LHO VE - Sat CP1 Fill

david.barker@ligo.org — Sat, 29 Mar 2025 10:18:47 -0700

Author: david.barker@ligo.org

Report ID: 83632

Sat Mar 29 10:13:20 2025 INFO: Fill completed in 13min 16secs

TC-B was quite noisy during the fill today.

Images attached to this report

H1 General - OPS Saturday day shift start

ryan.crouch@ligo.org — Sat, 29 Mar 2025 07:29:48 -0700

Author: ryan.crouch@ligo.org

Report ID: 83631

TITLE: 03/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 141Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 1mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.26 μm/s
QUICK SUMMARY:

14:17 UTC observing
The wind is much lower
Secondary microseism is decreasing

LHO General - Fri Ops Eve Summary

corey.gray@ligo.org — Fri, 28 Mar 2025 21:58:54 -0700

Author: corey.gray@ligo.org

Report ID: 83623

TITLE: 03/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

Had a bit of moody winds tonight---no sustained winds, not really strong winds, but the middle of the shift had waves of short gusty periods, two of which took H1 down. Luckily the winds died down toward the end of the shift, to allow H1 to get back to Observing. Took ETMy Mode1 to the settings Ryan C mentions in his summary.
LOG:

0130 Lockloss (due to EY winds)
- Ran an Alignment and made it back to Observing for a whopping 4-min, until...
0252 Lockloss due to Cornder winds)
- Ran an Alignment, but while getting ready for PRC, the FSS got fussy. Toggling the FSS Autolocker was the solution.
- Ran a 2nd Alignment.
- 0443 Observing

LHO FMCS - HVAC Fan Vibrometers FAMIS Check (FAMIS 26369)

corey.gray@ligo.org — Fri, 28 Mar 2025 21:01:09 -0700

Author: corey.gray@ligo.org

Report ID: 83630

For FAMIS #26369: All looks well for the last week for all site HVAC fans (see attached trends).

PEM

Images attached to this report

H1 SEI - BRS Trends (FAMIS 26453)

corey.gray@ligo.org — Fri, 28 Mar 2025 20:57:32 -0700

Author: corey.gray@ligo.org

Report ID: 83629

BRSx is in the middle of both of its thresholds, and BRSy is slowly trending down to the lower threshold.

SEI

Images attached to this report

H1 PSL - FSS Issues During Initial Alignment

corey.gray@ligo.org — Fri, 28 Mar 2025 20:28:46 -0700

Author: corey.gray@ligo.org

Report ID: 83628

Not sure what did it to the PSL's FSS, but noticed we were stuck before the PRC portion of Initial Alignment, and DIAG MAIN had the following messages flashing like the devil:

PSL_FSS: PZT MON is high, may be oscillating
PSL_FSS_TPD: RefCav transmission is low

On the FSS screen, the autolocker was going wild and the PZT_MON screen was all over the place.

Since the Autolocker was having issues, I toggled the autlocker off/on and this immediately calmed down the FSS and the IMC finally locked back up.

Going to restart the Initial Alignment. Because the winds are still pretty attrocious.

PSL

H1 General - H1 Lockloss At 252utc (752pm local): WIND

corey.gray@ligo.org — Fri, 28 Mar 2025 19:58:09 -0700

Author: corey.gray@ligo.org

Report ID: 83627

H1 was at NLN for 7min only to have another lockloss at 252utc (1427251941)---as of 434utc this one is still Analyzing, but----Pretty certain this will be chalked up to wind again---this time the gusts were strongest at the Corner (hear alot of wind activity outside and can see lots of tumbleweeds rolling by on the cameras).

H1 General - H1 Lockloss At 130utc (630pm local): WIND

corey.gray@ligo.org — Fri, 28 Mar 2025 18:42:13 -0700

Author: corey.gray@ligo.org

Report ID: 83626

H1 had a lockloss from a 4hr53m lock at 1:30utc (1427247021, this has an EY WINDY tag). Winds at EY were picking up around this time.

H1 CDS - VACSTAT detected LVEA vacuum glitch

david.barker@ligo.org — Fri, 28 Mar 2025 17:09:41 -0700

Author: david.barker@ligo.org

Report ID: 83625

Gerardo, Dave:

At 16:51:34 Fri 28mar2025 PDT we had another small vacuum glitch in the LVEA, which this time was reported by VACSTAT, detected by those gauges with increased sensitivity (BSC2, CP2, YARM and XARM). Attached trends show this was a modest ~0.1e-09 Torr increase. Rising edge about 10 seconds, pumpdown time about 3 mins.

H1 was locked throughout. I reset vacstat_ioc.service to clear the alarm.

Images attached to this report

H1 SEI - HAM1 ISI refit progress this week

jim.warner@ligo.org — Fri, 28 Mar 2025 16:32:26 -0700

Author: jim.warner@ligo.org

Report ID: 83624

This week Mitch and I opened the can for the ISI destined for HAM1 and started adding damping parts. Spring, flexure and GS13 can dampers have all been added. TMDs have been mostly assembled, but have not been tuned yet, we will figure that out next week. I just finished setting up the CPS field interface chassis with the new triax sensors after setting the phases for the sensors. For the moment one of the cards is set as a timing master, I will have to change that when we go to connect to the system. Next week, TMD tuning, st0 L4C install, in-vac parts for the new CPS and pre-installing lifting pads and covers for install into the chamber. Then we can close up and wait for HAM1 chamber to be ready to receive.

First 2 pics are a couple shots of the ISI, third shows the TMDs we built this afternoon, which still need magnets and tuning.

Images attached to this report

H1 General - OPS Friday day shift summary

ryan.crouch@ligo.org — Fri, 28 Mar 2025 16:30:36 -0700

Author: ryan.crouch@ligo.org

Report ID: 83615

TITLE: 03/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We lost lock from another earthquake, the wind started picking up during the afternoon but we relocked easily after an alignment. The violins have been damping nicely. The new settings I found for ETMY mode1 are FM1+FM5+FM10 G= -0.1, they damp mode1 well but don't really affect mode6.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
17:19	FAC	Chinook	VPW	N	Heat pump work, started at ~16:30	18:13
17:54	EE	Marc	CER	N	Trace C4 power supply wire	18:16
18:01	ISC	Mayank	Optics lab	LOCAL	ISS array	23:15
18:16	EE	Fil, Marc	CER	N	SUS-C4 power supply swap	18:37
18:17	ISC	Jennie	Optics lab	LOCAL	ISS array	19:23
18:39	FIT	Ibrahim	MidY	N	walk	19:29
18:56	TCS	Camilla	Optics lab	N	Turn on CO2 laser	19:13
19:18	ISC	Betsy	LVEA/CER	N	Grab vacstat bags	19:39
20:17	ISC	Keita	Optics lab	LOCAL	ISS array, PD adjustment	22:15
20:24	PSL	Jason	Optics lab	LOCAL	NPRO tests	22:51
20:42	TCS	Camilla, Matt	Optics lab	LOCAL	TCS CO2 laser work	22:01
21:10	PSL	RyanS	Optics lab	LOCAL	Help Jason with NPRO tests	22:51

15:19 UTC Observing
- I set ETMY mode1's gain to zero in lscparams (SUS)
17:42 UTC lockloss from a 6.6 from Cape Verde
- We did some TOO tasks during this downtime such as
  - Realigning the refcav alog83616
    - IMC to down and misaligned MC3 SUS
  - Swapping a dying SUS power supply in the CER
    - I put all the SUS in HAMs 1 & 2 to safe for this
- 19:25 UTC initial alignment
  - ALS_X (TRX_A_LF_OUT_DQ) would get fuzzy (~6x as thick of a line, 0.1 vs 0.6 min to max) then the WFS error signal would step out, DOF_2_P mainly, then it would come back in
20:40 UTC Observing

SUS

Images attached to this report

LHO General - Fri Ops Eve Transition

corey.gray@ligo.org — Fri, 28 Mar 2025 16:27:18 -0700

Author: corey.gray@ligo.org

Report ID: 83622

TITLE: 03/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 29mph Gusts, 18mph 3min avg
    Primary useism: 0.07 μm/s
    Secondary useism: 0.41 μm/s
QUICK SUMMARY:

RyanC handing over an Observing H1 (going on 2.8hrs). Violins are elevated, but they are damping down. Situation normal.

Was a bit breezy during my drive up here (Corner has some gusts just under 30mph).

H1 SQZ - FC detuning -34Hz and ADF (322Hz) off since Yesterday Afternoon

camilla.compton@ligo.org — Fri, 28 Mar 2025 16:08:42 -0700

Author: camilla.compton@ligo.org

Report ID: 83621

I accidently left the ADF off yesterday and set FC de-tuning to -34 vs nominal -36Hz 83597and 83601 where sdfs were accepted.

We've not using ADF right now, since we stoped using the sqz angle servo, so we will leave the 322Hz ADF line off for now, tagging DetChar.
Jennie found 34 vs 36Hz FC detuning are very similar in 83526, so also leaving as is.

DetChar

Images attached to this report

H1 PSL - Comment to PSL Status Report - Weekly

ryan.crouch@ligo.org — Fri, 28 Mar 2025 16:02:02 -0700

Author: ryan.crouch@ligo.org

Report ID: 83620

After Jasons touch up the TPD is now ~0.833 V

H1 CAL - Checking DHARD_P and DHARD_Y affect on sensing function on Wednesday 26th

jennifer.wright@ligo.org — Fri, 28 Mar 2025 14:13:42 -0700

Author: jennifer.wright@ligo.org

Report ID: 83576

Jennie W, Sheila

While Camilla changed the SRCL tuning (nominal for SRCL1_OFFSET is -191 counts) for squeezer tests today Sheila and I wanted to check if DHARD sensors are still sensitive to DARM. As there is coupling from DARM to DHARD and then DHARD back to DARM, this changes the DARM OLG and thus the sensing function.

I tried to check on whether the sensing function was affected by DHARD currently by looking at the coherence between low frequency PCAL lines below 20 Hz in DARM. The only one we still use is 17.1Hz, there where others used to monitor the low frequency sensing function and the SRC detuning, but these are no longer in use. The other calibration lines still in use below 20Hz are injections on the ETMX suspension.

Francisco looked at this in 2024 in alog #80267, for different offset values of the AS A WFS cwhich are used as a sensor in DHARD. For a setting of 0, which matches the current setting of this offset, the coherence (bottom graph) between DARM and DHARD looks like it is bellow 1 at 17.1 Hz, the SRCL1_OFFSET at the time was -290 counts.

I compared short spectra of DARM with coherences from CAL-DELTAL_EXTERNAL_DQ to ASC-DHARD_P_SM_DQ and ASC-DHARD_Y_SM_DQ. See this image.

For the detunings used, the 17.1Hz line only seems to show up strongly in the -90 count offset, see image of the darm spectra in the top left graph, DARM coherence with DHARD_P in the middle row left graph, DARM coherence with DHARD_Y in the bottom left graph, and the DHARD_P spectra in the top right graph. From the spectra it looks like the 17.1 Hz line is almost buried in the noise for most of the detunings.

Since all these measurements only used ~ 3 mins of data I decided to compare the hour long period from this entry where Camilla had the SRCL1 offset at -290 counts, to a period after commissioning was over when it was back at the nominal of -191 counts.

See this image where I have also added a graph of DHARD_Y spectrum in the middle right of the image.

Purple is the -290 count SRCL offset and Yellow is the -191 count offset. The coupling of the PCAL line to DHARD P and Y does not really change between the two different detunings, but since there is some coupling to DHARD we might want to revisit the AS A WFS offset. Also the coherence from DARM to DHARD_Y (bottom left graph in my first image below) for the same SRCL1 OFFSET (-290 counts, see this image) as Francisco's measurement was 0.6, compared to the 0.1 coherence he found so that might be a reason to keep looking at this issue.

Finally I include an ndscope of the optical spring frequency (f_S) and the coupled cavity pole frequency (f_C) changing with the detuning. NB: For future me, that optical spring frequency channel defaults to zero when the calculated value is very small I think.

SQZ

Images attached to this report

H1 SUS - Comment to Calibrating the PR3 OSEMs

edgard.bonilla@ligo.org — Fri, 28 Mar 2025 13:51:41 -0700

Author: edgard.bonilla@ligo.org

Report ID: 83619

Adding here the phases for the TFs used for the calibration. There's a 20 to 25 degree phase loss after the last resonance up to 20 Hz. I'm not sure what more to make out of it, I thought the phase loss would be an artifact of the OSEM readouts, but maybe someone with more knowledge can chime in.

Images attached to this report

H1 General - Comment to 17:42 UTC lockloss

ryan.crouch@ligo.org — Fri, 28 Mar 2025 13:40:19 -0700

Author: ryan.crouch@ligo.org

Report ID: 83618

20:40 UTC Observing

H1 SUS - Comment to SUS-C4 Power Supply Chirping

marc.pirello@ligo.org — Fri, 28 Mar 2025 11:53:56 -0700

Author: marc.pirello@ligo.org

Report ID: 83617

Due to earthquake we took a window of opportunity to replace the SUS-C4 Kepco Power Supply which controls HAM1 and HAM2 suspensions. These suspensions were placed into safe and the supply replaced. We replaced only the -18V supply, the +18V matching supply was replaced in December 2022 so we left it in place.

WP12406

M. Pirello, F. Clara

H1 PSL - PSL FSS RefCav Remote Beam Alignment Tweak

jason.oberling@ligo.org — Fri, 28 Mar 2025 11:18:58 -0700

Author: jason.oberling@ligo.org

Report ID: 83616

I took advantage of the recent earthquake to tweak the beam alignment into the FSS RefCav from the Control Room to improve the transmission, which had been dropping for the last several days. With the IMC unlocked the starting RefCav TPD was ~0.660 V, and after the alignment tweak (IMC still unlocked) the TPD is ~0.833 V.

H1 General - 17:42 UTC lockloss

ryan.crouch@ligo.org — Fri, 28 Mar 2025 10:44:02 -0700

Author: ryan.crouch@ligo.org

Report ID: 83614

17:42 UTC lockloss from a 6.6 from Cape Verde, holding in down till the motion subsides.

LHO VE - Fri CP1 Fill

david.barker@ligo.org — Fri, 28 Mar 2025 10:22:39 -0700

Author: david.barker@ligo.org

Report ID: 83613

Fri Mar 28 10:13:33 2025 INFO: Fill completed in 13min 29secs

Gerardo confirmed a good fill curbside. Note TC adjustments during fill when ice was being removed.

Images attached to this report

H1 General - Comment to OPS Friday DAY shift start

ryan.crouch@ligo.org — Fri, 28 Mar 2025 09:13:50 -0700

Author: ryan.crouch@ligo.org

Report ID: 83612

I found some new settings that are working, I added FM5 (-30 degrees) and switched the gain to negative. The working settings are FM1+FM5+FM10 G= -0.2

H1 SQZ - How to Take a SQZ Data Set

camilla.compton@ligo.org — Fri, 28 Mar 2025 08:59:50 -0700

Author: camilla.compton@ligo.org

Report ID: 83594

Sheila, Camilla

Aim to take 3 minutes of data peer point, watching BLRMs to check tere is no glitches. On DTT, set BW to 0.1Hz, 30 averages.

Example template is under camilla.compton/Documents/sqz/templates/dtt/20250327_SRCL_neg306.xml

Turn off SQZ ASC with H1:SQZ-ASC_WFS_SWITCH and check the SQA_ANG_SERVO isn't running once you get to FDS or FIS.
- If you go ot no SQZ and back to FDS/FIS, need to turn off again.

Data to take and how each data is used in the model:

No SQZ (for subtraction in models)
- Good time to measure NLG (as in 76542) and change NLG if wanted
Mean SQZ with ADF off (for loss calculation in models)
- Go to FIS with SQZ_MANAGER and then take SQZ_OPO_LR guardian to DOWN
FIS Mid SQZ +/- (for SRC de-tuning in models)
- Try to match high frequency SQZ to No SQZ level by increasing and decreasing SQZ angle from nominal SQZ.
FI ASQZ (for homodyne angle in models)
- Also +/- 10deg each side of nominal
FDS Mid SQZ +/- (for FC de-tuning)
FDS and FIS SQZ (because we want to see how good DARM can be)
- Maybe also +/- 10deg each isde of nominal

H1 General - Comment to OPS Friday DAY shift start

ryan.crouch@ligo.org — Fri, 28 Mar 2025 08:29:14 -0700

Author: ryan.crouch@ligo.org

Report ID: 83611

ETMY mode1 and 6 were both ringing up under nominal damping for the first 10 minutes so I've turned off the gain for now.

SUS

H1 PSL - PSL Status Report - Weekly

ryan.crouch@ligo.org — Fri, 28 Mar 2025 08:20:52 -0700

Author: ryan.crouch@ligo.org

Report ID: 83610

Closes FAMIS26379
Laser Status:
    NPRO output power is 1.864W
    AMP1 output power is 70.39W
    AMP2 output power is 140.2W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 51 days, 18 hr 58 minutes
    Reflected power = 22.69W
    Transmitted power = 106.0W
    PowerSum = 128.7W

FSS:
It has been locked for 0 days 0 hr and 59 min
TPD[V] = 0.662V

ISS:
The diffracted power is around 4.2%
Last saturation event was 0 days 8 hours and 41 minutes ago

Possible Issues:
FSS TPD is low

H1 General - OPS Friday DAY shift start

ryan.crouch@ligo.org — Fri, 28 Mar 2025 07:32:04 -0700

Author: ryan.crouch@ligo.org

Report ID: 83609

TITLE: 03/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 6mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.50 μm/s
QUICK SUMMARY:

There was a large EQ ~ 8 hours ago
We just had a LOWNOISE_ESD_ETMX lockloss
Wind is low, secondary microseism is just at the 90th percentile

H1 General - Comment to Lockloss @ 06:33 UTC from EQ and ISI Trips

ryan.short@ligo.org — Fri, 28 Mar 2025 07:05:02 -0700

Author: ryan.short@ligo.org

Report ID: 83608

H1 again called at 12:41 UTC as it wasn't able to finish an initial alignment. ALS-Y was having trouble staying locked, and I eventually ended up adjusting the BS in yaw to improve transmission as I noticed the ALS beam was clipped on the camera (it's still a bit clipped on the right, but less so now). After that, initial alignment was able to finish without issue, then relocking following that has been going automatically as well. H1 is currently relocking in MOVE_SPOTS.

H1 General - Comment to Lockloss @ 06:33 UTC from EQ and ISI Trips

ryan.short@ligo.org — Fri, 28 Mar 2025 02:22:17 -0700

Author: ryan.short@ligo.org

Report ID: 83607

I've untripped all platforms and set up H1_MANAGER for the night. SEI_ENV is still in LARGE_EQ, but H1_MANAGER should wait until the seismic configuration is fully out of any earthquake mode before trying to lock.

H1 General - Lockloss @ 06:33 UTC from EQ and ISI Trips

ryan.short@ligo.org — Fri, 28 Mar 2025 00:49:08 -0700

Author: ryan.short@ligo.org

Report ID: 83606

H1 called for assistance at 07:13 UTC when ISIs tripped for every QUAD, BS, and HAM8 due to a M7.7 earthquake and M6.4 aftershock out of Myanmar. Lockloss happened earlier at 06:33 UTC because of the S-waves of this quake, I'm assuming. At the worst of the shaking, peakmon was at the highest I can recall seeing it at over 128,000 counts.

H1 will be down for a while. I'll check in after a bit and untrip platforms if the shaking has calmed enough and start locking.

Lockloss, SEI

Images attached to this report

H1 SUS - Calibrating the PR3 OSEMs

edgard.bonilla@ligo.org — Thu, 27 Mar 2025 22:54:01 -0700

Author: edgard.bonilla@ligo.org

Report ID: 83605

Follow up to LHO alog 83200 and LHO alog 80863.

Brian and I thought of a better way of getting the M1 OSEMs in PR3 calibrated relative to the HAM2 GS13s: Use the ISI drives in L, T, V for frequencies above the suspension resonances to get an absolute calibration.

We can use the measurements Jeff took in LHO alog 80863 and project them in the OSEM basis, then use the translational (Longitudinal, Transverse, Vertical) drives to calibrate the OSEMs. Since the GS13s are calibrated to [m] all of the transfer functions (shown in the first attachment) are in [OSEM meters]/[GS13 meters]. At high frequencies (sufficiently above the resonances) the OSEMs should just be measuring (-1)*ISI motion, because the suspension is isolated. The calibration error will depend on how well we are able to drive L,T,V from the ISI without cross-coupling to any other DOF.

Figure 1 attached shows the 6x6 transfer matrix between the ISI drives and OSEMs (inputs are columns, and outputs are rows). We highlight the 6 translational transfer functions that can be used to calibrate the OSEMs in red. The drives seem decoupled enough to do the calibration (for example, we expect to see a length drive only in LF and RT, no motion anywhere else).

Figures 2,3, and 4 show a detail of the 6 transfer functions we will use for calibration, all of them should be scaled to 1 [OSEM m]/[GS13 m]. The scalings are:

T1 T2 T3 LF RT SD

       1.544          0            0            0            0            0      T1
            0        1.394       0            0            0            0      T2
            0            0        1.273         0            0            0      T3
            0            0            0        1.411         0            0      LF
            0            0            0            0        1.588         0      RT
            0            0            0            0            0        1.366   SD

Two things to note:

1) The relative calibrations are consistent with the ~15% mismatch that led to the V to R and the L to Y couplings that Brian and I observed in the comments of LHO alog 83200.

2) The absolute calibrations being in the ballpark of 1.5 seem large, but they are close to the calibration factor in plotHLTS_ISI_dtttfs_M1.m that transforms between [um/drive cts] to [m/N]. The transfer functions plotted always seem about a factor of 1.5 off from the MATLAB model. Maybe there's a connection that explains why the calibration factor seems so large.

Figure 5 shows all of the diagonal ISI to M1 transfer functions after applying the calibration factors. They all asymptote to 1 at high frequencies even though we only used L, T, and V for calibration. A good sign that we're on the right track.

Figure 6 shows the effect of the calibration on the M1 to M1 transfer matrix (inputs are columns, and outputs are rows). The solid Black trace is the corrected M1 to M1, the dashed lines show what it was before the sensor calibration. A few of the cross couplings become significantly better: [L-Y], [V-P-R] are the best performing.

I think this gets enough benefit for the ISI - SUS estimatior. It also might be worth trying this scheme in other suspensions where we would benefit from eliminating more cross terms in the OSEM transfer matrix.

SEI, SUS

Images attached to this report

H1 General - Ops Eve Shift End

oli.patane@ligo.org — Thu, 27 Mar 2025 22:08:45 -0700

Author: oli.patane@ligo.org

Report ID: 83604

TITLE: 03/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Just got to NLN and into Observing. When trying to relock earlier, we did have a lockloss from DHARD_WFS for some reason, but no issues after that. The wind is currently low but has had a couple instances of quickly spiking up above 20/25mph before dying back down, the second of which came with very heavy rain. Hopefully that doesn't happen again during the night. The secondary microseism is still very high, but doesn't look to be getting worse.
LOG:

23:30 Relocking and in OMC_WHITENING damping violins

00:33 NOMINAL_LOW_NOISE
00:34 Observing

03:03 Lockloss
- Lost lock at DHARD WFS
- Ran an initial alignment

05:06 NOMINAL_LOW_NOISE

05:07 Observing

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
20:59	ISC	Keita, Mayank	Opt Lab	Yes	ISS PD array (Keita out 21:55)	01:27
21:23	TCS	Camilla, Matt	Opt Lab	Yes	CO2 laser testing	21:56
22:10	ISC	Jennie	OptLab	Yes	Looking for Keita	22:18

H1 General - Lockloss

oli.patane@ligo.org — Thu, 27 Mar 2025 20:05:18 -0700

Author: oli.patane@ligo.org

Report ID: 83603

Lockloss @ 03/28 03:03UTC after 2.5 hours locked. Of course right after I put in my midshift report saying that we were locked

Lockloss

H1 General - Ops EVE Midshift Status

oli.patane@ligo.org — Thu, 27 Mar 2025 20:01:40 -0700

Author: oli.patane@ligo.org

Report ID: 83602

Observing at 155Mpc and have been Locked for 2.5 hours. Nothing to report

LHO General - Comment to Ops Day Shift End

oli.patane@ligo.org — Thu, 27 Mar 2025 17:42:12 -0700

Author: oli.patane@ligo.org

Report ID: 83601

Back to Observing 03/28 00:34UTC after accepting a couple diffs for SQZ and IOPLSC0

CDS, SQZ

Images attached to this report

LHO General - Ops Day Shift End

thomas.shaffer@ligo.org — Thu, 27 Mar 2025 16:42:09 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83590

TITLE: 03/27 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Calibration and commissioning started the day. After a lock loss at 12PT we have been struggling to relock. We just recently made it to the last state before low noise, but the violins are very high from a few lock losses at Transition_From_ETMX and Move_Spots. Oli is damping those now and hopefully we'll be back to observing soon. It's not entirely clear why we had issues relocking. The primary and secondary useism are definitely elevated, but at levels that we have locked before. Wind is under 20mph, as well.
LOG:

1810, 1815, 1818, 1832 HAM7 WD tripped when squeezing was turned off
1900 Lock loss

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:38	FAC	Tyler	EX	n	Adjust fan speed manually	16:08
16:29	ISC	Sheila, Jeff	LVEA	n	OMC DCPD injections, LVEA wifi on during this time	17:34
16:44	PSL	Jason	Opt Lab	n	Unpacking laser in lab and receiving	16:55
18:28	FAC	Kim, Nelly	MY	n	Tech clean	18:48
18:58	-	Tony	LVEA	n	Checking for water leaks	19:33
19:11	CDS	Marc	CER	n	Check on power supplies	19:33
19:11	CDS	Fil	LVEA	n	Check on CPS glitching	19:33
20:17	PSL	Jason	MX	n	Drop off	20:32
20:59	ISC	Keita, Mayank	Opt Lab	Yes	ISS PD array	22:18
21:23	TCS	Camilla, Matt	Opt Lab	Yes	CO2 laser testing	21:56
22:10	ISC	Jennie	OptLab	Yes	ISS help	22:18

H1 General - Ops Eve Shift Start

oli.patane@ligo.org — Thu, 27 Mar 2025 16:40:27 -0700

Author: oli.patane@ligo.org

Report ID: 83599

TITLE: 03/27 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 17mph Gusts, 11mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.51 μm/s
QUICK SUMMARY:

In OMC_WHITENING and damping violins. Hopefully we'll be back to Observing soon.

H1 CAL - Comment to Sensing function after SRCL offset changes

jeffrey.kissel@ligo.org — Thu, 27 Mar 2025 14:58:58 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83598

Also -- side note -- I'd been skeptical of the accuracy of the live spring frequency calculation, H1:CAL-CS_TDEP_F_S_OUTPUT. Looks like it *is* a good measure, or at least the same measure as the sweeps, of the spring frequency. See attached trends of f_s, surrounding the times of these calibration measurements. Nice!

Images attached to this report

H1 ISC - Comment to Loud 10.3 kHz Features in OMC DCPD ADC Input Don't Cause Broadband Down-Conversion

jeffrey.kissel@ligo.org — Thu, 27 Mar 2025 14:46:37 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83596

As an aside, here I attach a trend of the H1:OMC-DCPD_[A,B]_WINDOW_[MAX/MIN] channels (the details of which can be found in LHO:62310). In short they're looking at the 4-channel SUM of each DCPD's 4x analog copies of the voltage going into the the ADC, in units of 4x ADC counts. In the attached trend, I divide these by 4 (or scale by 0.25), to compare against the saturation limit of a single ADC channel, which is what we really want. Remember this the General Standards Low Noise Fast ADC, which spreads its 40 Vpp input range across 18 bits, so the saturation limit is +/-2^17 = +/- 131072 [ADC ct]. In the trend, I highlight when we engaged the relays (without any SR785 excitation on) and when we turned them off to show how loud that is. We did *not* break lock from those glitches, but it sure made the ETMX actuators sad for a bit and caused a big glitch in the detector. I also highlight the period over which we increase the amplitude of our excitation from 0.1 to 250 [mVpk_SE, SR785 SRC Output]. Our excitation doesn't start to show up as contributing to this ADC channel MIN/MAX time-series until we hit excitation amplitude of 50 [mVpk_SE, SR785 SRC Output]. It reaches at most 40k [ADC ct] = 6.1 [Vpp_DIFF, ADC Input] (again, of 40 Vpp_DIFF, so 15% of the range) at our loudest excitation amplitude of 250 [mVpk_SE, SR785 SRC Output]. I also attach the same OMC DCPDA photocurrent ASD in the main entry, but I add what the DCPD photo current ASD looks like under lesser excitation amplitudes; 10 mVpk in BLACK, 50 mVpk in ORANGE, and the one I've already shown, 250 mVpk (again in BLUE). Again, the 250 [mVpk SRC Output] excitation is a factor of 5x above the amplitude that this PI mode was at the time of the low frequency broadband noise. Sheila reminds me that we've seen PIs *louder* than this time and *not* seen any broadband low-frequency noise increase. But anyways, even at 50 [mVpk_SE, SR785 SRC Output] -- which according to this ASD (a) The equivalent to a photocurrent of 4.07e-7 [A/rtHz] at 10.3 kHz (b) Comparable to the height of 4.04e-7 [A/rtHz] at 10.428 kHz (for a 0.1 Hz frequency resolution, which DTT turns into an 8 sec FFT or 1/8 = 0.125 Hz resolution, and Hann window; ENBW = 0.187) -- this starts to dominate the ADC's RMS, since there is a noticeable change in the WINDOW MAX/MIN channels. But it's a small fraction of the ADC range. I note that the OMC DCPD analog whitening was ON at all times during our measurements today, and during each of the old data sets. So that means, at these frequencies, there's an extra gain of 10x on the TIA output voltage.

Images attached to this report

H1 SQZ - SQZ back to nominal

camilla.compton@ligo.org — Thu, 27 Mar 2025 14:20:18 -0700

Author: camilla.compton@ligo.org

Report ID: 83597

After this morning's SRCL offset change and SQZ NLG change 83589, I returned FC de-tuning to -34Hz, SQZ angle to 171, and OPO trans setpoint to 80uW. Adjusted OPO temp and measured NLG to be 12 following 76542

opo_grTrans_ setpoint_uW	Amplified Max	Amplified Min	UnAmp	Dark	NLG (usual)	NLG (maxmin)	OPO Gain
80	0.0110211	0.0002941	-0.000023	0.0009199	11.7	12.7	-8

H1 CAL - Sensing function after SRCL offset changes

francisco.llamas@ligo.org — Thu, 27 Mar 2025 13:53:38 -0700

Author: francisco.llamas@ligo.org

Report ID: 83592

FranciscoL, SheilaD, JeffK

I compared the sensing functions from calibration reports 20250327T160138Z, and 20250322T190652Z to look for correlations with the SRCL offset change done before the routinely Thursday calibration measurement. We see a decrease of the detuned SRC spring frequency from 7.343 Hz to 2.191 Hz.

I am attaching each sensing model generated by pydarm. Second attachment (20250322T190652Z_sensing_mcmc_compare) is for the measurement done last Saturday, third attachment (20250327T160138Z_sensing_mcmc_compare) for the measurement done today. We trust the model because the fit (orange trace) and the data (green dots) match well above the 10 Hz fit range. Additionally, the data on both measurements below 10 Hz shows a similar behavior. This gives us (1) confidence that the change in the sensing function was indeed from SRCL detuning and (2) we may have other sources of coupling into the sensing function -- thinking about DHARD as the main culprit.

The first attachment (sensing_ratio) shows the relative change of each measurement labeled by their report id. We see that the latest calibration measurements (orange and black), have been consistent with the latest front-end calibration (blue) -- more confidence towards SRCL changing the sensing function.

While this improves the detuning of the interferometer, the overhead to update the calibration has deemed to high for the few days left that will be running. We will reassess when we are close to coming back into observing mode (June)

What I did to make plots:

(1) Get the report from the calibration measurement this morning:

In the terminal -- no need to activate any environments or configuring the terminal in any way -- running

pydarm report

will create a report of the latest measurement that was done. This command will not change FE calibration so, for now, this is a safe way to get data and manipulate/evaluate it.

(2) Used script to retrieve sensing function measurements from calibration reports:

The script located at

/ligo/home/francisco.llamas/CAL/sensing_function/20250326_plot_sensing_measurements/compare_measurements.py

will load the measurements as provided by their report id. I personally chose a dictionary to add comments for labeling purposes. The function 'sensing' will load the measurement and get the response. The rest is plotting aesthetics.

NOTE To enable the pydarm package -- and run the script -- run in terminal

conda activate /ligo/groups/cal/conda/pydarm

Images attached to this report

H1 ISC - Loud 10.3 kHz Features in OMC DCPD ADC Input Don't Cause Broadband Down-Conversion

jeffrey.kissel@ligo.org — Thu, 27 Mar 2025 13:23:54 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83595

J. Kissel, S. Dwyer Sheila and I were finally able to use an SR785 by HAM6 ISC-R5 (see setup and discussions in LHO:83523, LHO:83466, and LHO:83468) to inject a loud sinusoidal excitation into the OMC DCPD transimpedance amplifier TEST inputs via analog interface of the OMC DPCD whitening chassis. Remember, this is in hopes to mimic a PI ring-up and identify whether or not this would cause ~10-100 Hz broadband noise increase in the detector sensitivity, as was seen on 2025-03-12 (LHO:83335). We saw NO broadband low frequency noise increase with an excitation amplitude that results in a factor of 5x *higher* photocurrent on the DCPDs than during the PI ring-up. I attach a four-panel plot, and because that makes each panel small, I also attach the same plots zoomed in to each panel. In the plots, I'm comparing four different times: - (RED) 2025-03-12 17:32 UTC -- the time of the 10.4 kHz PI mode ring-up from LHO:83335 - (BLUE) 2025-03-20 16:13 UTC -- the time I used in LHO:83468 to assess how much drive I should be able to put in, - (GREEN) 2025-03-27 17:16 UTC -- a time during the loudest, 250 [mVpk_SE, SR785 SRC output] excitation - (BROWN) 2025-03-27 17:30 UTC -- just after we're done with our tests and everything is unplugged in the nominal configuration Upper panels of 1st Attachment (zoomed in with 2nd and 4nd attachment)-- the 65 kHz version of the OMC DPCD A channel that has NO digital anti-aliasing (under the obfuscated channel name H1:OMC-PI_DCPD_64KHZ_AHF_DQ), calibrated into photocurrent on DCPDA (which needs only a conversion of 0.001 [A/mA]). - Left panel (and 2nd attachment) is zoomed in around the 10.2 - 10.5 kHz region, showing the excitation, The acoustic mode forest, and except for the unthermalized data, the 02 (or 20) optical mode hump. - Right panel (and 4th attachment) is the full ASD across the 10 Hz - 25 kHz frequency range. Lower panels of 1st Attachment (zoomed in with 3rd and 5th attachments) -- GDS-CALIB_STRAIN converted to DARM displacement (which needs only a multiplication by the length of the arms, L = 3995 [m]). - Left panel (and 3rd attachment) zooms in on the 10-100 Hz frequency region, and - Right panel (and 5th attachment) shows the whole 10 - 7000 Hz sensitivity. There's NO change between BLUE (excitation OFF) and RED (excitation ON), and thus no evidence of broadband noise increase we saw in BROWN (during PI ring-up). %%%% Measurement notes - For no particular reason, we turned on BOTH DCPDA and DCPDB test excitation relays (see LHO:83466 for how). That means our single-ended qqq [mVpk] analog excitation from the SR785, converted to qqq [mVpk] differential by the SR785 Accessory Box (whose TF is 1 [V_DIFF] / 1 [V_SE]), was driving that qqq [mVpk] amplitude into BOTH A & B channels' TEST inputs within the TIA. So, the excitation seen in OMC DCPDA's ADC input is also in DCPDB, and thus the sum of the the two, OMC_DCPD_SUM, the DARM error signal, actually sees twice this amplitude. But, the sum is done digitally, after down-converting to 16 kHz, so it's not relevant to "is the ADC getting saturated" discussions; just important to bring up in "how much of this excitation can the IFO handle" discussions. CAL, DetChar, ISC

Images attached to this report

H1 SQZ - Bad SQZ Data Set with SRCL offset at -306

camilla.compton@ligo.org — Thu, 27 Mar 2025 12:07:07 -0700

Author: camilla.compton@ligo.org

Report ID: 83589

Sheila, Camilla

This morning we changed SRCL offset from -191 to -306 and FC detuning from -34 to -28, as discussed in 83570. Decided to take a SQZ dataset here.

Increased SHG launch, turned OPO trans setpoint up from 80uW to 95uW to increase NLG from 11 to 19 (as we had earlier in O4). Measured NLG with 76542. OPO gain left at -8.

Had some strange HAM7 CPS glitches and WD trips. Think we manged to avoid these effecting the data.

Forgot to turn of SQZ ASC, realized and then we lost lock, this data is not good as the AS42 and ZM alignment offsets were moving around a lot.

opo_grTrans_ setpoint_uW	Amplified Max	Amplified Min	UnAmp	Dark	NLG (usual)	NLG (maxmin)	OPO Gain
95	0.0179401	0.000271566	-0.00002333	0.000906905	19.3	20.8	-8

Type	Time (UTC)	SQZ @1kHz (dB)	Angle	DTT Ref
No SQZ	18:11:30 - 18:20:00	N/A	N/A	ref 0
MeanSQZ w/o ADF	18:22:30 - 18:25:30	13.3	N/A	ref1
FIS Mid SQZ +	18:28:30 - 18:31:30		(CLF-) 195	ref2
FIS Mid SQZ -	18:38:30 - 18:41:30		(CLF-) 127	ref3
FIS ASQZ	18:44:00 - 18:47:00	15.8	(CLF-) 68	ref4
FIS ASQZ +10deg	18:47:30 - 18:50:30	15.2	(CLF-) 78	ref5
FIS ASQZ -10deg	18:51:00 - 18:54:00	15.2	(CLF-) 58	ref6

Images attached to this report

H1 ISC - POP_A_RF45 I and Q DEMOD ADC [ct] For SRCL OFFSET -191 vs. -306 [ct]

jeffrey.kissel@ligo.org — Thu, 27 Mar 2025 12:05:24 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83593

J. Kissel, S. Dwyer When we apply a large SRCL offset, as we did today LHO:83583, we get more 45 MHz sideband field in the POP port. The POP A LSC RFPD (in HAM1) is demodulated in analog at 45 MHz, and its I & Q signals are piped into a standard 16 bit ADC whose saturation limit is +/- 2^15 = 32768 [ct]. The I channel is used as the error signal for SRCL, and the Q is used as the error signal for MICH, so if we get anywhere near that saturation limit, these loops lose there error signals and the IFO loses lock. So, just a sanity check, here's the POP A I & Q raw ADC channels across the transition from -191 [ct] to -306 [ct] SRCL offset. -306 [ct] does not saturate the POP A I or Q ADC channels.ISC

Images attached to this report

H1 SEI - HAM7 CPS WD trips today

thomas.shaffer@ligo.org — Thu, 27 Mar 2025 11:48:29 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83591

While the SQZ team was commissioning in the control room, the HAM7 ISI tripped 4 times on the CPSs. Looking at the trip plots this looks like the CPS glitches that we have seen in the past (attachment 1).

HAM7 definitely trips more forequently than other ham chambers (attachment 2), and we know that we have seen these when there are people working in the racks nearby, but today the sqz team was adjusting TEC temperatures, closing beam diverters, or just doing nothing when these happened.

FRS33714 filed since I couldn't find one specifically for this, though we do have tickets open for other HAM6 CPS gltiching: FRS: 11640 FRS: 11642 Aggregate IIET: 11643.

CDS

Images attached to this report

LHO VE - Thu CP1 Fill

david.barker@ligo.org — Thu, 27 Mar 2025 11:01:43 -0700

Author: david.barker@ligo.org

Report ID: 83588

Thu Mar 27 10:13:56 2025 INFO: Fill completed in 13min 52secs

Images attached to this report

H1 SQZ - Comment to SQZ Data set with high NLG, then adjusted SRCL offset and FC detuning.

camilla.compton@ligo.org — Thu, 27 Mar 2025 10:51:15 -0700

Author: camilla.compton@ligo.org

Report ID: 83585

This morning we put SRCL offset to -306, FC de-tuning -28Hz. I then ran SCAN_SQZANG which changed the angle form 171 to 161 and compare the before and after DARM, attached, SQZ looks alot better at higher frequencies, however the range, attached, is similar or a little worse, maybe the 300Hz (yellow BLRMs) squeezing is slightly worse.

Updated DTT legend as had typo.

Images attached to this report

H1 ISC - Comment to HAM6 loss estimate remeasured with OMC ASC off

jennifer.wright@ligo.org — Thu, 27 Mar 2025 10:30:18 -0700

Author: jennifer.wright@ligo.org

Report ID: 83048

Images attached to this report

H1 ISC - Comment to Updating OMC Offsets Today

jennifer.wright@ligo.org — Thu, 27 Mar 2025 10:29:17 -0700

Author: jennifer.wright@ligo.org

Report ID: 83587

As I did for the previous DARM offset measurement on the 20th Feb, in alog #83586, I checked that the DARM offset does not show a clear trend in the OMC REFL power. This would be another way of quantifying the mode-matching of the DARM mode to the OMC, but since the mode-matching is good, no trend can be seen in this channel (top plot) as we change the DARM offset.

Images attached to this report

H1 ISC - Comment to HAM6 loss estimate remeasured with OMC ASC off

jennifer.wright@ligo.org — Thu, 27 Mar 2025 10:21:38 -0700

Author: jennifer.wright@ligo.org

Report ID: 83586

Jennie, Sheila

Sheila wanted me to checked that we can't use the OMC REFL power as a calculation method for how much of the TM00 light does not make it through the OMC. If the mode-matching of the light at the AS port to the OMC is good, we would expect not to see much of a variation at the OMC REFL port as we change the DARM offset, and indeed we can't. See this image, with REFL power at the top.

Images attached to this report

H1 CAL - Calibration Sweep 1530 UTC

thomas.shaffer@ligo.org — Thu, 27 Mar 2025 09:26:00 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83582

Followed the usual wiki instructions.

Simulines command run:

gpstime;python /ligo/groups/cal/src/simulines/simulines/simuLines.py -i /ligo/groups/cal/H1/simulines_settings/newDARM_20231221/settings_h1_20250212.ini;gpstime

Simulines start:

PDT: 2025-03-27 08:35:50.875109 PDT
UTC: 2025-03-27 15:35:50.875109 UTC
GPS: 1427124968.875109

Simulines stopped prematurely due to some SCRL offsets getting changed midway through:

PDT: 2025-03-27 08:54:32.154549 PDT
UTC: 2025-03-27 15:54:32.154549 UTC
GPS: 1427126090.154549

Simulines started again:

PDT: 2025-03-27 09:01:37.213384 PDT
UTC: 2025-03-27 16:01:37.213384 UTC
GPS: 1427126515.213384

Simulines end:
PDT: 2025-03-27 09:25:15.138110 PDT
UTC: 2025-03-27 16:25:15.138110 UTC
GPS: 1427127933.138110

Files:

2025-03-27 16:25:14,982 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20250327T
160138Z.hdf5
2025-03-27 16:25:14,990 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_202
50327T160138Z.hdf5
2025-03-27 16:25:14,995 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_202
50327T160138Z.hdf5
2025-03-27 16:25:15,000 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_202
50327T160138Z.hdf5
2025-03-27 16:25:15,004 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_202
50327T160138Z.hdf5

Images attached to this report

H1 GRD - Adding the PCAL{X,Y}_STAT nodes to the main IFO node list

thomas.shaffer@ligo.org — Thu, 27 Mar 2025 09:24:07 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83584

Tony created the PCAL{X,Y}_STAT nodes a few weeks ago, and has been monitoring and testing over that time. They look to be working as intended, flagging any major issues with the PCAL system. I've now removed them from the excluded nodes list that the IFO node looks at so that now if either of these nodes is out of its nominal state or the node is not OK==True, then the IFO node will not be OK and we will not be able to go to Observing.

CAL, OpsInfo

H1 CAL - Normal Calibration Measurement Suite Spoiled; Taking Calibration Suite w/ SRCL Offset at -306 ct and Filter Cavity Detuning -28 Hz

jeffrey.kissel@ligo.org — Thu, 27 Mar 2025 09:21:54 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83583

J. Kissel, S. Dwyer, T. Shaffer TJ was diligently running at regularly scheduled calibration measurement suite with the current nominal configuration of the IFO. Sheila and I got too excited about what other measurements we needed to do during the commissioning period today, and I quickly and boldly made the assessment that the simulines sweeps were done by just looking at the front wall DARM FOM. And said "we can go ahead with the first [commissioning] measurements" and changed the SRCL offset to grab an augmented IFO configuration sweep as planned. We realized only ~2 mins after that the nominal configuration sweep *was* still going, and this is me eating my hat. Sorry team. TJ killed the simulines session, which apparently automatically cleans up the calibration sweep measurement report infrastructure, so there's no evidence of it. So, today's regular calibration has been spoiled. The broadband injection in the nominal configuration did go forward to completion, that's /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/ PCALY2DARM_BB_20250327T153021Z.xml The "nominal" configuration -- compared to what we want to change today: Filter Cavity Detuning = -34 Hz offset SRCL Offset -191 [ct] Here's the measurements with the augmented IFO configuration, with Filter Cavity Detuning = -28 Hz offset SRCL Offset -306 [ct] /ligo/groups/cal/H1/measurements/PCALY2DARM_BB PCALY2DARM_BB_20250327T155611Z.xml /ligo/groups/cal/H1/measurements$ ls */*20250327*.hdf5 DARMOLG_SS/DARMOLG_SS_20250327T160138Z.hdf5 PCALY2DARM_SS/PCALY2DARM_SS_20250327T160138Z.hdf5 SUSETMX_L1_SS/SUSETMX_L1_SS_20250327T160138Z.hdf5 SUSETMX_L2_SS/SUSETMX_L2_SS_20250327T160138Z.hdf5 SUSETMX_L3_SS/SUSETMX_L3_SS_20250327T160138Z.hdf5 Due to the augmented SRCL offset, these measurements should *not* be included in the collection of measurements used for creating estimates of residual sensing function systematic error. The filter cavity detuning change only impacts the noise performance of the IFO, so if need be, you *can* still use the actuation function portion of the measurement suite. ISC

LHO General - Ops Day Shift Start

thomas.shaffer@ligo.org — Thu, 27 Mar 2025 07:33:16 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83581

TITLE: 03/27 Day Shift: 1430-2330 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: 18mph Gusts, 10mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.34 μm/s
QUICK SUMMARY: Locked for 3 hours. DIAG_MAIN is reporting "RefCav transmission low", tagging PSL. No other alarms or notifications. Planned calibration and commissioning time today from 1530-1900 UTC.

PSL

H1 General - Ops Eve Shift End

oli.patane@ligo.org — Wed, 26 Mar 2025 22:04:42 -0700

Author: oli.patane@ligo.org

Report ID: 83580

TITLE: 03/27 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Observing at 156Mpc and have been locked for almost 1 hour. One lockloss during my shift but relocking went well and was almost completely hands off besides me selecting an initial alignment.
LOG:

23:30UTC Observing at 156 Mpc and locked for almost 12 hours
01:55 Kicked out of Observing due to squeezer losing lock
01:59 Back into Observing after squeezer got back to FDS

02:41 Lockloss
- I immediately decided to start an initial alignment since the lock had been relatively long
04:13 NOMINAL_LOW_NOISE
04:15 Observing

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
16:57	ISC	Mayank	Opt Lab	Yes	ISS PD array	00:53
21:46	TCS	Camilla, Matt	Opt Lab	Yes	CO2 laser testing	23:46

H1 General - Comment to Lockloss

oli.patane@ligo.org — Wed, 26 Mar 2025 21:16:06 -0700

Author: oli.patane@ligo.org

Report ID: 83579

04:15UTC Back to Observing

H1 General - Lockloss

oli.patane@ligo.org — Wed, 26 Mar 2025 19:44:23 -0700

Author: oli.patane@ligo.org

Report ID: 83578

Lockloss @ 03/27 02:41UTC after just over 15 hours locked

Lockloss

H1 General - Ops Eve Shift Start

oli.patane@ligo.org — Wed, 26 Mar 2025 17:52:58 -0700

Author: oli.patane@ligo.org

Report ID: 83577

TITLE: 03/27 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 6mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.21 μm/s
QUICK SUMMARY:

Currently Observing and have been locked for over 13 hours. I forgot to put this in earlier when TJ was leaving oops

LHO General - Ops Day Shift End

thomas.shaffer@ligo.org — Wed, 26 Mar 2025 16:14:36 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83567

TITLE: 03/26 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Commissioning time for three hours this morning, which we stayed locked for. We have been locked for 11.5 hours now. I've been impatient and have tried damping down ITMY violin modes 5&6 by making small gain changes. I think I slightly sped it up, but barely.
LOG:

1521-1526 SQZr unlocked, relocked
1550 dropped Observing for ~20sec due to an accidental click in the control room
1600 Commissioning time start
1903 Back to Observing

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:07	FAC	Nelly	MX	n	Tech clean	15:32
16:47	CDS	Fil, Marc	Mech room	n	Pulling cables	19:49
16:56	FAC	Kim	H2 building	n	Tech clean	17:10
16:57	ISC	Mayank	Opt Lab	Yes	ISS PD array	00:10
19:49	ISC	Keita	Opt Lab	Yes	ISS PD array	21:01
21:46	TCS	Camilla, Matt	Opt Lab	Yes	CO2 laser testing	23:46

Images attached to this report

H1 SQZ - RF3 demod angle scans yesterday

sheila.dwyer@ligo.org — Wed, 26 Mar 2025 15:56:31 -0700

Author: sheila.dwyer@ligo.org

Report ID: 83575

Yesterday we were sitting waiting for the violin modes to damp before changing the OMC whitening, so I took advantage of the time to do some scans of the RF3 demod phase (which is labeled RF6 in beckhoff) with different SRCL offsets since we suspected that the SQZ angle servo might not work well during thermalization because of the changin SRC detuning. However, it seems that doesn't have much impact on the SQZ angle readback, and this servo should work fine with changes in SRC detuning.

The first subplot shows the ADF ellipse, and then the channels after the normalization that is used to turn it into a circle, these look the same for the two offsets. The next plot shows the readback of the SQZ angle, which is arctan2 of the normalized signals from the first plot. This relation ship is not linear, it should be described by the relationship Daniel wrote here: 49026

The bottom plot shows the sqz blrms, we want to operate the sevo where this is minimzed, where it seems that the sqz angle readback is a good error signal to use.

Images attached to this report

H1 SEI - Comment to Comparison Between Coherent and Incoherent Sums to generate H1SUSBS SusPoint Euler Motion from H1ISIBS

jeffrey.kissel@ligo.org — Wed, 26 Mar 2025 15:53:06 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83574

Brian says: "huh. I'm not happy about being right here. Something is wrong with that ISI. This means there is very strong coupling between Z and RX/RY on that table, something I've been worried about for a while, but not able to improve. This was just supposed to be a 'thing to keep in mind when checking your work'." This forced me to look at my own plots again with a different lens, that I think is worth sharing: "Mmm -- maybe you're thinking too fast here -- the RX/RY coupling to Sus Point Vertical is entirely via geometry, not anything funky with the cross-coupling within the ISI DOFs. Sure, improving RX/RY would help by whatever way you want, but this doesn't point fingers at any internal, ISI, RX/RY to Z (or vice verse) coupling. But also -- the good news is that we "improve" the Sus. Point vertical motion for the BS by a factor of 5x at 0.5 Hz just by showing the better math'ed projection! And actually -- now that I stare at the V plot more closely, the *coherent* V motion (the black-dashed trace) is not limited by RX or RY *anywhere*: - Where the RY/RX component motion is comparable to Z component (say, between 0.5 Hz and 3 Hz), apparently, the *differential* RX / RY motion is smaller than the component, and - Where the RX/RY component motion is clearly different from each other (between 5 and 30 Hz), the Z motion is far larger anyways." But, back to Brian's worry about this ISI's performance -- remember to head to LHO:83530 for discussion :: yes, this is one of the worst performing ISIs and we don't know why.CSWG, ISC, SEI

H1 SQZ - Comment to SQZ Data set with high NLG, then adjusted SRCL offset and FC detuning.

sheila.dwyer@ligo.org — Wed, 26 Mar 2025 14:46:45 -0700

Author: sheila.dwyer@ligo.org

Report ID: 83572

Here are some plots of Camilla's first dataset above, changing the SRC detuning while adjsuting the squeezing angle for high frequency squeezing, made with the same code used for 80318, which is available here

For the gwinc model, I've set the generated squeezing to 23 dB based on Camilla's measured NLG of 58. Based on the loss estimates from 83457, I've set the Injection loss to 0.178 (17.8% loss) and the PD efficiency (readout efficiency) to 0.815, and the phase noise to 0.

The third attachment shows the model where I've manually adjusted the SRC detuning to roughly match the subtracted squeezing, and the second shows a linear fit of SRCL offset to these detunings. This suggests that the SRCL offset should be at -306 counts to reduce the SRCL offset, and that we are currently running with a SRCL detuning of 0.013 radians.

Images attached to this report

H1 SQZ - SQZ Data set with high NLG, then adjusted SRCL offset and FC detuning.

camilla.compton@ligo.org — Wed, 26 Mar 2025 13:42:13 -0700

Author: camilla.compton@ligo.org

Report ID: 83570

Sheila, Camilla

Reduced HAM7 rejected pump power and increased SHG launch, turned OPO trans setpoint up to 120uW and measured NLG with 76542 to be 58 (this was a little lower than with 120uW in 83370). OPO gain turned down from -8 to -12. ADF was on for all apart from "Mean SQZ w/o ADF".

Type	Time (UTC)	Angle	DTT Ref
No SQZ	16:01:00 - 16:15:00	N/A	ref 0
SQZ	16:56:30 - 16:59:30	(CLF-) 174	ref1
SQZ +10deg	17:00:00 - 17:03:00	(CLF-) 184	ref2
SQZ -10deg	17:03:30 - 17:06:30	(CLF-) 164	ref3
Mean SQZ w/o ADF	17:07:30 - 17:10:30	N/A	ref4
Mean SQZ w/ ADF	17:11:00 - 17:14:00	N/A	ref5
Mid SQZ +	17:17:00 - 17:20:00	(CLF-) 209	ref6
Mid SQZ -	17:21:30 - 17:24:30	(CLF-) 152	ref7
ASQZ	17:27:30 - 17:30:30	(CLF-) 80	ref8
ASQZ +10deg	17:31:30 - 17:34:30	(CLF-) 90	ref9
ASQZ -10deg	17:35:00 -17:38:00	(CLF-) 70	ref10
Then went to FDS
FDS SQZ, SRCL -191	17:46:00 - 17:49:00	(CLF-) 174	ref11
FDS SQZ +10deg, SRCL -191	17:49:30 - 17:51:30 (2mins)	(CLF-) 184	ref12
FDS SQZ -10deg, SRCL -191	17:52:00 -17:54:00 (2mins)	(CLF-) 164	ref13
FDS SQZ, SRCL -290	17:56:30 - 17:59:30	(CLF-) 146	ref14
FDS SQZ +10deg, SRCL -290	18:00:00 - 18:02:00 (2mins)	(CLF-) 156	ref15
FDS SQZ -10deg, SRCL -290	18:02:30 - 18:04:30 (2mins)	(CLF-) 136	ref16
Starting FC detuning -36Hz
FDS SQZ, SRCL -290, FC detuning -40Hz	18:08:30 - 18:11:30	(CLF-) 146	ref17
FDS SQZ, SRCL -290, FC detuning -32Hz	18:12:00 - 18:15:00	(CLF-) 146	ref18
FDS SQZ, SRCL -290, FC detuning -32Hz	18:18:00 - 18:21:00	(CLF-) 149	ref19
FDS SQZ, SRCL -290, FC detuning -28Hz*	18:21:30 - 18:24:30	(CLF-) 149	ref20
FDS SQZ, SRCL -290, FC detuning -24Hz	18:225:30 - 18:28:30	(CLF-) 149	ref21
OPO trans back to nominal 80uW, NLG 12
FDS SQZ, SRCL -290, FC detuning -28Hz	18:46:30 - 18:49:00 (2m30)	(CLF-) 170	ref22
FDS SQZ, SRCL -191, FC detuning -36Hz	19:03:30 - 19:06:00 (2m30)	(CLF-) 171	ref23

* For NLG of 58, SRCL -290, FC detuning -28Hz looked best.

Plots attached of FIS data showing SQZ, Mean SQZ, Mid SQZ and also SQZ and ASQZ, filename shown on screenshot.

Also did FDS SQZ, +/-10deg with nominal SRCL detuning (-191) and -290, plot attached. And adjusted the FC de-tuning with SRCL offset at -290, plot attached.

Finally we went back to the nominal NLG (NLG of 12 with 80uW OPO Trans setpoint) and checked FDS SQZ with the best found settings at high NLG: SRCL -290, FC de-tuning -28Hz and back to nominal settings, DARM plot attached. We didn't have time to fully tune the angle in both settings so could repeat this to check at which settings the range is best. Sheila ran a SQZ angle scan at these settings (SRCL -290, FC de-tuning -28Hz), see attached, it is less frequency dependent than than the scans taken the day before at SRCL -191 (nominal) and -190, FC de-tuning -36Hz (nominal), plot attached.

opo_grTrans_ setpoint_uW	Amplified Max	Amplified Min	UnAmp	Dark	NLG (usual)	NLG (maxmin)	OPO Gain
120	0.0540944	0.00026378	0.000913452	-0.0000233	57.75	58.68	-12
80	0.010857	0.0002927	0.000904305	-0.0000219	11.72	12.57	-8

Images attached to this report

LHO VE - Wed CP1 Fill

david.barker@ligo.org — Wed, 26 Mar 2025 10:25:49 -0700

Author: david.barker@ligo.org

Report ID: 83571

Wed Mar 26 10:13:03 2025 INFO: Fill completed in 12min 59secs

Gerardo confirmed a good fill curbside.

Images attached to this report

H1 SQZ - SQZ FIS SRC Detuning Data set

camilla.compton@ligo.org — Wed, 26 Mar 2025 10:14:30 -0700

Author: camilla.compton@ligo.org

Report ID: 83569

Reduced HAM7 rejected pump power and increased SHG launch, turned OPO trans setpoint up to 120uW and measured NLG with 76542 to be 58 (this was a little lower than with 120uW in 83370).

Data attached with filename shown on screenshot.

Type	Time (UTC)	SRCL	Angle	DTT Ref
No SQZ	16:01:00 - 16:15:00	N/A	N/A	ref 0
FIS	16:20:30 - 16:23:30	-191	(CLF-) 174	ref1
FIS	16:27:30 - 16:30:30	-90	(CLF-) 218	ref2
FIS	16:35:00 - 16:38:00	0	(CLF+) 107	ref3
FIS	16:42:00 - 16:45:00	-290	(CLF-) 146	ref4
FIS	16:48:00 - 16:51:00	-390	(CLF-) 129	ref5

Note that I left the OPO servo gain at -8, but we have previously used -12dB for 120uW OPO trans (83370)

opo_grTrans_ setpoint_uW	Amplified Max	Amplified Min	UnAmp	Dark	NLG (usual)	NLG (maxmin)	OPO Gain
120	0.0540944	0.00026378	0.000913452	-0.0000233	57.75	58.68	-8

Images attached to this report

H1 General - Briefly dropped observing 1521-1526 SQZr unlocked

thomas.shaffer@ligo.org — Wed, 26 Mar 2025 08:28:06 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83568

The squeezer unlocked, then relocked from 1521-1526UTC. The SQZ_OPO_LR node now has the message "pump fiber rej power in ham7 high, nominal 35e-3, align fiber pol on sqzt0".

SQZ

H1 CAL - PCAL EndX measurement Results.

anthony.sanchez@ligo.org — Wed, 26 Mar 2025 08:13:40 -0700

Author: anthony.sanchez@ligo.org

Report ID: 83561

Today Francisco and I went down to the End station to make an End X measurement using PS4.
He took some time to do a Beam Spot move, and then we got started on the ES measurement following the instructions in the T1500062 Procedures and Log .

I did happen to look inside the RX sphere when swapping spheres and saw a small black dot on the spectralon on the inside of the shpere. It actually looks like it may be some tiny pitting in the spectralon shell.

(pcal_env) tony@LHOGC000360:~/Documents/PCAL/git/pcal/O4/ES/scripts/pcalEndstationPy$ python generate_measurement_data.py --WS "PS4" --date "2025-03-24"
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2025-03-24 corrected to ES temperature 299.4 K :
-4.701550919294612 -0.0002694340454223 4.0632996079052654e-05
Copying the scripts into tD directory...
Connected to nds.ligo-wa.caltech.edu
martel run
reading data at start_time: 1426956240
reading data at start_time: 1426956650
reading data at start_time: 1426956970
reading data at start_time: 1426957350
reading data at start_time: 1426957720
reading data at start_time: 1426958030
reading data at start_time: 1426958180
reading data at start_time: 1426958960
reading data at start_time: 1426959280
Ratios: -0.46129682487781465 -0.4660359949229844
writing nds2 data to files
finishing writing
Background Values:
bg1 =        8.837346; Background of TX when WS is at TX
bg2 =        5.591501; Background of WS when WS is at TX
bg3 =        8.780952; Background of TX when WS is at RX
bg4 =        5.680601; Background of WS when WS is at RX
bg5 =        8.772249; Background of TX
bg6 =        0.562586; Background of RX

The uncertainty reported below are Relative Standard Deviation in percent

Intermediate Ratios
RatioWS_TX_it      = -0.461297;
RatioWS_TX_ot      = -0.466036;
RatioWS_TX_ir      = -0.455766;
RatioWS_TX_or      = -0.460962;
RatioWS_TX_it_unc = 0.088015;
RatioWS_TX_ot_unc = 0.088093;
RatioWS_TX_ir_unc = 0.093864;
RatioWS_TX_or_unc = 0.092606;
Optical Efficiency
OE_Inner_beam                      = 0.988107;
OE_Outer_beam                      = 0.989162;
Weighted_Optical_Efficiency        = 0.988635;

OE_Inner_beam_unc                  = 0.059352;
OE_Outer_beam_unc                  = 0.059902;
Weighted_Optical_Efficiency_unc    = 0.084326;

Martel Voltage fit:
Gradient = 1636.730463;
Intercept = 0.022399;

Power Imbalance = 0.989831;

Endstation Power sensors to WS ratios::
Ratio_WS_TX = -1.078361;
Ratio_WS_RX = -1.391797;

Ratio_WS_TX_unc = 0.053544;
Ratio_WS_RX_unc = 0.043735;

=============================================================
============= Values for Force Coefficients =================
=============================================================

Key Pcal Values :
GS = -5.135100; Gold Standard Value in (V/W)
WS = -4.701551; Working Standard Value

costheta     =      0.988362; Angle of incidence
c            =      299792458.000000; Speed of Light

End Station Values :
TXWS         =        -1.078361; Tx to WS Rel responsivity (V/V)
sigma_TXWS   =        0.000577; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS         =        -1.391797; Rx to WS Rel responsivity (V/V)
sigma_RXWS   =        0.000609; Uncertainity of Rx to WS Rel responsivity (V/V)

e = 0.988635; Optical Efficiency
sigma_e = 0.000834; Uncertainity in Optical Efficiency

Martel Voltage fit :
Martel_gradient = 1636.730463; Martel to output channel (C/V)
Martel_intercept = 0.022399; Intercept of fit of Martel to output (C/V)

Power Loss Apportion :
beta          =        0.998895; Ratio between input and output (Beta)
E_T          =        0.993751; TX Optical efficiency
sigma_E_T          =        0.000419; Uncertainity in TX Optical efficiency
E_R          =        0.994851; RX Optical Efficiency
sigma_E_R          =        0.000419; Uncertainity in RX Optical efficiencyForce Coefficients :
FC_TxPD          =        7.896238e-13; TxPD Force Coefficient
FC_RxPD          =        6.188319e-13; RxPD Force Coefficient
sigma_FC_TxPD          =        5.403288e-16; TxPD Force Coefficient
sigma_FC_RxPD          =        3.778561e-16; RxPD Force Coefficient
data written to ../../measurements/LHO_EndX/tD20250325/

Martel Voltage Tests
WS_at_RX.png
WS_at_RX_BOTH_BEAMS.png
WS_at_TX.png
LHO_EndX_PD_ReportV5.pdf

This adventure has been brought to you by Matt Todd, Francisco L. & Tony Sanchez.

Images attached to this report

Non-image files attached to this report

Sosb-office25032518550.pdf

LHO General - Ops Day Shift Start

thomas.shaffer@ligo.org — Wed, 26 Mar 2025 07:39:11 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83566

TITLE: 03/26 Day Shift: 1430-2330 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: 7mph Gusts, 5mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY: Locked for 3 hours, calm environment, no alarms. The violins are still slowly coming down, at 5e-16 in DARM atm. The usual ITMY modes 5&6 are the culprits. There is some planned extra commissioning time today coordinated with LLO.

H1 General - Ops Eve Shift End

oli.patane@ligo.org — Tue, 25 Mar 2025 22:07:04 -0700

Author: oli.patane@ligo.org

Report ID: 83565

TITLE: 03/26 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Lost lock a few minutes ago unfortunately. Reason still unknown. We had just gotten back up to Observing less than 30 minutes ago after an earlier unknown lockloss at 02:21 UTC (Here is the sunset from the overpass at the time of that lockloss - Photo credit to Francisco)
LOG:

23:30UTC In OMC_WHITENING damping violins
23:35 NOMINAL_LOW_NOISE
23:37 Observing
01:54 Superevent S250326y

02:21 Lockloss (Lockloss Desert View - P.C. Francisco)
- Lost lock at RESONANCE, decided to run an initial alignment since PRMI/DRMI had trouble right before

04:33 NOMINAL_LOW_NOISE
04:35 Observing

04:57 Lockloss

Images attached to this report

H1 General - Comment to Lockloss

oli.patane@ligo.org — Tue, 25 Mar 2025 21:58:54 -0700

Author: oli.patane@ligo.org

Report ID: 83564

04:33 Back Observing

H1 General - Lockloss

oli.patane@ligo.org — Tue, 25 Mar 2025 21:58:42 -0700

Author: oli.patane@ligo.org

Report ID: 83563

Lockloss @ 03/26 04:57 UTC

Lockloss

H1 General - Lockloss

oli.patane@ligo.org — Tue, 25 Mar 2025 19:23:41 -0700

Author: oli.patane@ligo.org

Report ID: 83562

Lockloss @ 03/26 02:21 UTC

Lockloss

H1 SEI - ISI CPS Noise Spectra Check Weekly FAMIS

oli.patane@ligo.org — Tue, 25 Mar 2025 17:46:33 -0700

Author: oli.patane@ligo.org

Report ID: 83560

Closes FAMIS#26035, last checked 83269

Script reports that noise is elevated for:
ETMY_ST2_CPSINF_V2

Overall, elevated noise in the corner station seen between 7.6 and 9 Hz in various sensors.
I also noticed that the noise between 0.1 and 1 Hz falls off slightly faster this week as compared to last week, getting down to 1.5e-9 before 1 Hz, versus last week the sensors were still reading 5e-9 at 1 Hz.

HAM2
- The peak in V2 and V3 at 10.5 Hz is a bit larger

HAM2/HAM3/HAM4/HAM5/HAM6
- H3/V3 have peaks between 7.6 to 9 Hz that are up to half an order of magnitude higher than those frequencies were last week

ITMX ST1
- Increased noise between 7.6 to 9 Hz in all (I think) sensors
ITMX ST2
- Increased noise at 7.6 Hz in H3

ITMY ST1
- Slightly elevated noise between 7.6 to 9 Hz in H1/H3/V1/V3
ITMY ST2
- Slightly elevated noise between 7.6 to 9 Hz in all (I think) sensors

BS ST1
- Slightly elevated noise between 7.6 to 9 Hz in V1/V2/V3
BS ST2
- Slightly elevated noise between 7.6 to 9 Hz in all (I think) sensors

Non-image files attached to this report

CPS_spectra_16:45-03_25_2025.pdf

H1 General - Observing

oli.patane@ligo.org — Tue, 25 Mar 2025 16:42:52 -0700

Author: oli.patane@ligo.org

Report ID: 83559

Back to observing after finishing maintenance and then damping violins for over 2 hours. Accepted a few SDFs related to ALS and that's it.

Images attached to this report

LHO General - Ops Day Shift Summary

ryan.short@ligo.org — Tue, 25 Mar 2025 16:36:34 -0700

Author: ryan.short@ligo.org

Report ID: 83557

TITLE: 03/25 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Busy maintenance day mostly focused on preparing cabling for HAM1 ISI installation. After that wrapped up, ran an initial alignment with some code testing, then H1 was able to lock without issue and fully automatically. Had to wait in OMC_WHITENING to damp violins (likely my fault for breaking lock during powerup this morning).

14:40 - H1 locking, but stopped for maintenance day
- ISC_LOCK to 'IDLE' and seismic environment to 'MAINTENANCE'
19:33 - Maintenance finished, starting initial alignment and automation testing (RyanC & TJ)
20:38 - IA and testing finished, starting lock acquisition
21:22 - Reached OMC_WHITENING; needing to sit here and damp violins
23:35 - Reached NLN

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:38	FAC	Kim	EX	N	Technical cleaning	16:04
14:49	FAC	Chris	X-arm	N	Tumbleweed clearing	19:58
14:58	CAL	Tony, Francisco	PCalLab	Local	Prep for measurements	15:28
15:00	FAC	Tyler	Staging	N	Moving ISI container; shop -> staging	15:43
15:11	CDS	Erik	CR	N	Rebooting FOMs	15:11
14:38	FAC	Nellie	EY	N	Technical cleaning	15:17
15:27	IAS	Jason, RyanC	LVEA	N	FARO surveying	19:14
15:29	CAL	Tony, Matt, Francisco	EX	YES	PCal measurements	17:58
15:34	AOS	Camilla	LVEA/OptLab	N	Putting away parts	15:59
15:36	CDS	Fil, Marc	LVEA/CER	N	HAM1 field cabling	19:25
15:43	VAC	Travis, Janos	EX	N	Compressor work	18:25
15:44	FAC	Tyler	CS/MX/MY	N	3IFO and capital inventory	19:44
15:46	VAC	Richard	LVEA	N	Turn on roughing pump panel	17:07
15:59	VAC	Jordan, Janos	LVEA	N	Bringing parts in via FC door	17:07
15:59	FAC	Tyler, Contractor	H2 Building	N	HVAC work	19:59
16:02	FAC	Mitchell	LVEA	N	Clearing off SEI racks	17:12
16:05	FAC	Kim	LVEA	N	Technical cleaning	18:54
16:08	AOS	Betsy	LVEA	N	Checking on progress	16:25
16:14	SEI	Jim	LVEA	N	Checking on progress	17:12
16:19	TCS	Camilla	OptLab	N	Grabbing parts	16:23
16:21	ISC	Mayank, Jennie	OptLab	Local	ISS array work	20:52
18:12	SEI	Jim	LVEA	N	Testing loadcell readers	18:27
19:15	CDS	Richard	LVEA	N	Talking to Fil and Marc	19:21
19:17	AOS	Jason	OptLab	-	Inventory	19:28
19:30	OPS	Camilla	LVEA	N	Sweep	19:45
20:36	CDS	Marc	CER	N	Listening for power supplies	21:07
20:54	ISC	Keita, Mayank	OptLab	Local	ISS array work	22:45
21:22	TCS	Camilla, Matt	OptLab	Local	CO2 laser work	22:30

LHO General - Comment to Ops Day Shift Start

ryan.crouch@ligo.org — Tue, 25 Mar 2025 16:32:12 -0700

Author: ryan.crouch@ligo.org

Report ID: 83546

Power cycling the dust monitor did not help, later in the day I restarted the IOC using telnet which was successful.

PEM

H1 General - Ops Eve Shift Start

oli.patane@ligo.org — Tue, 25 Mar 2025 16:32:00 -0700

Author: oli.patane@ligo.org

Report ID: 83558

TITLE: 03/25 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: SEISMON_ALERT
    Wind: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.25 μm/s
QUICK SUMMARY:

Waiting in OMC_WHITENING still while damping violins. We're pretty close so hopefully will be getting into NLN soon.

H1 SEI - Comparison Between Coherent and Incoherent Sums to generate H1SUSBS SusPoint Euler Motion from H1ISIBS

jeffrey.kissel@ligo.org — Tue, 25 Mar 2025 15:52:48 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83556

J. Kissel, O. Patane, B. Lantz After seeing my post of the current (2025-03-19) performance of the H1ISIBS in LHO:83470, Brian -- in his LHO:83473 comment -- rightly cautioned Oli to beware the difference between (1) a "statistical" or "incoherent" model of the CART2EUL projection to the suspension point, where . one takes the ASDs of the CART DOFs (which are inherently only containing amplitude information, no phase relation between channels), . multiplies them by the CART2EUL coefficients, and . takes the quadrature sum to form an ASD model of the euler basis motion, vs. (2) a "linear combination" or "coherent" model of the CART2EUL project to the suspension point, where . the time-series of each CART DOF are multiplied by the CART2EUL coefficients, . the time-series are then coherently summed (where "coherently" summed just means the amplitude AND phase relationship between the channels has been preserved), and . then an ASD is taken of that to form an ASD model of the euler basis motion. He states - "if the DOFs are independent (which maybe they are, and maybe they are not), then using the quadruture sum of the ASDs, (1), is a reasonable thing to do." and - "I think this difference [between (1) and (2)] not going to impact any of your calculations" I'd not seen a comparison of these two models either at all or in a long time, every chamber + SUS combination is different, and I had the data, so I made the comparison. I'll discuss the 6 Euler Basis plots in reverse-traditional order, because they're easiest to understand progressively that way. YAW This plot is uninteresting, because the BS projection matrix from CART to EUL has only one unity element, mapping RZ directly to Yaw. However, it lets me introduce what I'll be plotting. In the upper panel, this shows the both models of ASDs and the underlying Cartesian components multiplied by the CART2EUL matrix element. As expected here, the thick black dashed ASD -- the coherent sum (2) model -- is identical to that think magenta dashed ASD -- the incoherent sum model (2). The lower panel is the ASD ratio of the linear sum (2) divided by the incoherent sum (1). Of course, for this DOF, the two models are identical, so this ASD ratio is identically 1.0 across the whole frequency band. With me so far? Good. :-P PITCH Here, because the Beam Splitter suspension is mounted in the center of the ISI BS optical table, yaw'd 45 degrees, RX and RY map to PITCH via sqrt(2) with the same sign. But the RX and RY performance of the ISI BS is slightly different, so the ratio between (2) and (1) is interesting. Most notably around the HEPI cross-beam foot resonance (traditionally called the "HEPI Pier resonance" prior to 2014; see LHO:13505) -- the broad feature at ~7 Hz -- where the ASD ratio shows that the incoherent sum model (1) under predicts Sus. Point displacement by a factor of ~1.35x w.r.t. the coherent sum model (2). And then at some other feature at ~17 Hz, the incoherent sum model (1) is over predicting the Sus. Point displacement by ~(1/0.8) = 1.25x. ROLL OK, now flip the sign of the contribution of RY, and watch the coherent sum drop -- fascinating! The contribution of that same ~7 Hz feature is now dramatically over-predicted by the incoherent sum, by a factor of ~(1/0.4) = 2.5x. Are these two the inverse of each other? No! I don't show it explicitly, but comparing (2)/(1) for roll (the inverse of what's plotted) and (1)/(2) for pitch, the 7 Hz number is 0.74x and 0.52x respectively, so markedly different! VERTICAL Now we're getting really interesting -- for vertical, Z is mapped one-to-one, but RX and RY are contributing in opposite sign, and with only *roughly* the same magnitude [m/rad] CART2EUL coefficient. The incoherent sum (1) is overestimating the vertical displacement by as much as a factor of ~(1/0.2) = 5x where the vertical motion is limited by RX and RY between 0.5 and 3 Hz. Wow! I won't look type thru the rest of the plot, because the plot describes it best, but boy is it more interesting than I thought it would be. TRANSVERSE With transverse, even though this degree of freedom "doesn't matter" for the beam splitter, now we're cooking with 5 contributing Cartesian degrees of freedom and except for RZ they're all contributing at interesting levels. Again, you reading the plot is more useful than me describing it here, but it's quite interesting that the linear sum (2) predicts more motion between 0.6 Hz and 3.5 Hz and the incoherent sum (1) predicts more motion overestimates the motion between 3.5 to 15 Hz. LONGITUDINAL Finally, the DOF we work the hardest on, shows contribution from all 5 Cartesian degrees of freedom. A lucky-coincidence perhaps, but it looks like the models are about the same for most of the frequency region, and the incoherent sum (1) is over-predicting the displacement between 3.5 to 15 Hz, which is re-enforcing Brian's comment. WHAT DOES IT ALL MEAN? Brian is, again, definitely right to call out that the linear sum (1) model is a better model of the displacement of the Sus. Point than the incoherent sum. But, both I (and perhaps even he) definitely wasn't expecting factors of 2x discrepancy, let alone factors of 5x. So, I think I might make Brian's conclusion from LHO:83473 a little stronger -- the difference between models will impact the calculations of the Bigger Beam Splitter Suspension (BBSS) performance, so for the update to the seismic input motion, I'll *not* just update the performance from the ~2005 seisBSC.m estimate to the current 2025 real *cartesian* performance incoherently projected to the Sus Point, but instead update it to the current 2025 real *euler* Sus. Point performance computed in the front-end.CSWG, ISC, SUS

Non-image files attached to this report

2025-03-19_H1ISIBS_CohvsQuadSum.pdf

H1 SUS - Comment to cross-coupling and reciprocal plants

brian.lantz@ligo.org — Tue, 25 Mar 2025 15:06:00 -0700

Author: brian.lantz@ligo.org

Report ID: 83555

Here's a view of the Plant model for the HLTS - damping off, motion of M1. These are for reference as we look at which cross-coupling should exist. (spoiler - not many)

First plot is the TF from the ISI to the M1 osems.
L is coupled to P, T & R are coupled, but that's all the coupling we have in the HLTS model for ISI -> M1.

Second plot is the TF from the M1 drives to the M1 osems.
L & P are coupled, T & R are coupled, but that's all the coupling we have in the HLTS model for M1 -> M1.

These plots are Magnitude only, and I've fixed the axes.

For the OSEM to OSEM TFs, the level of the TFs in the blank panels is very small - likely numerical issues. The peaks are at the 1e-12 to 1e-14 level.

Images attached to this report

Non-image files attached to this report

HLTS_model_ISI_2_M1_OSEM.pdf

HLTS_model_M1_2_M1_OSEM.pdf

H1 SUS - SUS-C4 Power Supply Chirping

marc.pirello@ligo.org — Tue, 25 Mar 2025 14:25:56 -0700

Author: marc.pirello@ligo.org

Report ID: 83554

The Kepco Power Supply for SUS-C4 started chirping at the end of maintenance today. By 2pm the chirping is more regular. The draw on the supply is 7A, typical failing fans last a few days once they get to this stage. We should replace this one before the weekend, as a target of opportunity. Down time will be 30 mins start to finish.

WP12406

M. Pirello, F. Clara

H1 CAL - Pcal XY comparison investigation - Beam back to center

francisco.llamas@ligo.org — Tue, 25 Mar 2025 14:12:08 -0700

Author: francisco.llamas@ligo.org

Report ID: 83550

FranciscoL, TonyS, MattT, RickS

On Tuesday, March 25, we reverted the PCALX lower beam to its nominal center. We expect to see a change of 4 HOPs in \chi_XY -- returning to the value it was two week ago.

Target was placed with a 33 degree offset as seen on the first attachment (TARGET_ON -- featuring a responsible scientist, wearing laser goggles). Each individual beam voltage values, as found, were very similar to the values recorded at the end of the move done last week.

The following table shows the voltage values as read by the Keithley voltmeter we use during the procedure

Step	Comment	Readout [V]
1	Both beams - target off	3.379
2	Both beams - target on (as found) (BEFORE_MOVE)	2.937
3	Lower beam after actuation	1.395
4	Both beams - target on (AFTER_MOVE)	2.903
5	Both beams - target off	3.394

The IFO has not regain lock at the time of writing this alog which limits further observations from this move.

Images attached to this report

H1 CDS - HAM1 ISI Electronics

filiberto.clara@ligo.org — Tue, 25 Mar 2025 13:57:44 -0700

Author: filiberto.clara@ligo.org

Report ID: 83553

WP 12393

The FE and IO chassis for h1seih16 were powered down for in-rack cabling of the ISI electronics. All cables are now routed and dressed. The long field cables were left disconnected, will wait until they are in connected at the flange.
The AI chassis on U38 was removed. AA chassis from U39 was moved down. This matches LLO's rack configuration, alog 75328.

CDS Team

SEI

Images attached to this report

H1 GRD - New ISC_library decorator for IMC locklosses at 10W

ryan.crouch@ligo.org — Tue, 25 Mar 2025 13:53:08 -0700

Author: ryan.crouch@ligo.org

Report ID: 83552

RyanC, TJ

I wrote a new decorator in ISC_library (@ISC_library.bring_unlocked_imc_2w_decorator(nodes)) for the specific scenario of the IMC losing lock while we're at 10Ws which would give it trouble relocking - alog82436. The decorator looks for the IMC being unlocked with a power above 2Ws and if the rotation stage is stationary it requests the LASER_PWR GRD to 2Ws.

We sprinkled the decorator into ALIGN_IFO, INIT_ALIGN, into the MICH, SRC and AS_CENTERING states, I also added it to CHECK_MICH_FRINGES and MICH_OFFLOADED in ISC_LOCK. We successfully tested it today during an initial alignment by breaking the IMC lock during these states.

H1 General - LVEA Swept following T1500386

camilla.compton@ligo.org — Tue, 25 Mar 2025 12:49:01 -0700

Author: camilla.compton@ligo.org

Report ID: 83551

Unplugged the two blue Genie lifts (W-bay and by ITMX). Unplugged an unused extension cord under the input arm. Removed batteries from phone in SQZ-bay.

Lights off, paging system already off. Ryan checked WAP is off. There's more water than usual under the VAC pump on the y-arm, not usually concerning, will mention to VAC team.

LHO VE - Comment to New EX clean air supply is installed

travis.sadecki@ligo.org — Tue, 25 Mar 2025 11:36:33 -0700

Author: travis.sadecki@ligo.org

Report ID: 83549

Connection to the purge air header was completed today. Next up, acceptance testing.

Images attached to this report

LHO VE - Tue CP1 Fill

david.barker@ligo.org — Tue, 25 Mar 2025 11:06:12 -0700

Author: david.barker@ligo.org

Report ID: 83548

Tue Mar 25 10:12:47 2025 INFO: Fill completed in 12min 43secs

Images attached to this report

H1 General - Comment to OPS OWL Shift Summary

sheila.dwyer@ligo.org — Tue, 25 Mar 2025 10:31:38 -0700

Author: sheila.dwyer@ligo.org

Report ID: 83547

Ryan Short, Sheila

Last November the power out of this laser dropped 13% after the current was reduced to get it operating in a more stable region during the PSL NPRO difficulties, 81117. Daniel lowered some thresholds and raised some gains at the time, but not the ALS Y LASER IR threshold. It has been close to the limit since but only drifted below last night, due to it's normal long slow drift. I've lowered the threshold to 4 mW now, so that we have a similar level of headroom for this error as we did before the laser current drop. I've accepted this in safe.snap but not in observe

Ryan Short also has been looking at some of our other ALS locking problems. He noticed that sometimes the ALS PLL beckhoff gives an error based on the reference cavity transmission. This is leftover from when the ALS pick off was in transmission of the reference cavity, but it has been moved so this error check isn't helpful anymore. We've set the threshold to -1 for ALS X and Y H1:ALS-Y_FIBR_LOCK_REFCAV_TRANSLIM, and also accepted these in safe.snap, but not observe.

Images attached to this report

LHO General - Comment to Ops Day Shift Start

ryan.short@ligo.org — Tue, 25 Mar 2025 07:42:41 -0700

Author: ryan.short@ligo.org

Report ID: 83545

Halted locking for the start of maintenance day. ISC_LOCK to 'IDLE' and seismic environment to 'MAINTENANCE' at 14:40 UTC.

LHO General - Ops Day Shift Start

ryan.short@ligo.org — Tue, 25 Mar 2025 07:34:30 -0700

Author: ryan.short@ligo.org

Report ID: 83544

TITLE: 03/25 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.25 μm/s
QUICK SUMMARY: H1 is currently relocking up to MOVE_SPOTS. Looks like H1 was able to lock twice last night and most recently lost lock about an hour ago. Maintenance day today, but I'll let H1 continue until those activities begin.

Diode room dust monitor reports dust counts have not changed
Wind low, microseism steady around 75th percentile

H1 CDS - Workstations updated

erik.vonreis@ligo.org — Tue, 25 Mar 2025 06:25:16 -0700

Author: erik.vonreis@ligo.org

Report ID: 83543

Workstations were updated and rebooted. Os packages were updated, and conda packages were also updated.

In the CDS conda environment, gwpy was upgraded to version 3.0.12. Among other improvements, this version fixes an issue that could cause matplotlib to lock up while creating pltos after importing gwpy.