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Reports until 07:34, Tuesday 29 July 2025
H1 General
ryan.crouch@LIGO.ORG - posted 07:34, Tuesday 29 July 2025 - last comment - 10:34, Tuesday 29 July 2025(86050)
OPS Tuesday day shift start

TITLE: 07/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 0mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

Comments related to this report
ryan.crouch@LIGO.ORG - 08:09, Tuesday 29 July 2025 (86051)Lockloss, SUS
Link

When the SUS_CHARGE was finishing up and SWAPPING_BACK_TO_ETMX ETMX L3 started to constantly saturate and there was a big line on DARM at ~150. This behavior persisted even after the GRD was done and went back to waiting. (tagging SUS).

 

15:02 UTC I induced a lockloss at by flipping the polarity of H1:IMC-REFL_SERVO_IN1POL, to break the lock and to stop the EX saturations.

elenna.capote@LIGO.ORG - 10:12, Tuesday 29 July 2025 (86060)
Link

I took a look at why there were saturations, and I think it's because of our changes yesterday. When the measurement finished, the ETMX bias was reverted to the new value that Sheila and I used yesterday, but the L3 drivealign gain was set to the old value of 198 instead of the new value of 88. I looked at the script and I don't understand exactly how that happened since it appears that it pulls the values right from LSCparams, but the ndscope I attached shows this is what happened.

Images attached to this comment
ryan.crouch@LIGO.ORG - 10:34, Tuesday 29 July 2025 (86063)
Link

I think this was due to the fact that the SUS_CHARGE GRD was not reloaded after lscparams was changed, I've reloaded the GRD.

H1 CDS
erik.vonreis@LIGO.ORG - posted 06:41, Tuesday 29 July 2025 (86049)
Workstations updated

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

H1 ISC
corey.gray@LIGO.ORG - posted 22:28, Monday 28 July 2025 (86043)
Mon EVE Ops Summary

TITLE: 07/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Earthquake
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

Today's handoff was recovery (basically waiting a few hours) for the earth to calm down after M6.5 & 7.0 EQs, but there was also Monday commissioning.

For locking, once we were back to "CALM", ran an uneventful alignment, and proceeded locking.  The violins were a little elevated, but we've seen worse and after about 20min, H1 went to NLN, BUT only stayed locked a few minutes (no obvious culprits/symptoms on this lock).  For the 2nd lock, did NOT run an alignment (but went to Check Mich Fringes +PRMI as per usual), this time H1 did not need to wait extra for violins, BUT in the 1-2 minutes prior to completing the NLN state, there were 0.36 Hz oscillations in ASC (biggest on yaw channels) and then there was a lockloss 30sec after NLN. 

Operator Note From the Weekend:  All of this is different H1 behavior from the weekend shifts---H1 locking has been easy and automated for the most part with no  issues and decent durations on the locks, too!  So these 2 locklosses in a row are new/different. 

Perhaps these were flukes.  Plan is to continue as usual for the night and hope we have better luck locking tonight and look at these issues in the morning.

H1 automatically moved on while I have been writing alogs and texting/chatting with people, and for this 3rd lock of the shift is currently going to 60W as get ready to leave the site.

On a Wildlife note:  At sunset, spotted a couple porcupine (hadn't seen them over the weekend) as well as a coyote nearby.
LOG:

H1 ISC
corey.gray@LIGO.ORG - posted 22:14, Monday 28 July 2025 (86047)
2nd Lockloss In A Row

HEADLINE:  2nd Lockloss In A Row (Both locklosses tonight within seconds/minutes of completing NLN)--This is also after EXCELLENT/automated locking since Fri, BUT post-commissioning + big EQs today)

For this 2nd locking attempt, H1 didn't linger as long to complete OMC Whitening (because violins were probably better than they were for that last lock).  But for this one, as soon as H1 completed NLN, there was ~2min of oscillations (not really ring-ups, mor like glitch, ring down and then glitch and ring down....see attached---where the images 1-4 are screenshots of FOMs). 

Had been chatting with Elenna, because she proactively let me know we'd have some SDF diffs from the ETMX changes from Commissioning which preceded the big EQs.  After the 2nd Lockloss, I contacted Elenna again.  She mentioned the TMSx being an issue.  She also asked me what was the frequency of the ASC oscillations it is 0.36Hz (5th attachement).

Elenna looked at the 2nd lockloss and mentioned it was a TMSx thing (https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1437792496).  For this 2nd lockloss the ASC oscillations were also more in Yaw (and she mentioned this was something they would be working on tomorrow).

After chatting with Elenna, consulted with Jenne to see about plan for the night and it has been decided to proceed as normal.  We only have these 2-data points for locking post-EQ in the last couple hours.  So the thought is  for the next locks we might get lucky (only fishy thing is locking has been marvelous as far as the last 3 days over the weekend). 

Have also contacted TJ to give him a heads up.  If same locking issues continue two or more times, plan is to address this problem during Maintenance in the morning.

Images attached to this report
LHO General
corey.gray@LIGO.ORG - posted 19:54, Monday 28 July 2025 - last comment - 22:09, Monday 28 July 2025(86046)
Almost 8hrs Later: Back To Observing Post A Pair Of Massive EQs (M6.5 + M7.0)......BUT.....

M6.5 Malaysian & M7.0 New Zealand EQs Kept H1 Down For Almost 8hrs.   Once SEI_ENV went from EARTHQUAKE to CALM: 

Then went to OBSERVING finally.....but less than 5-min later, H1 had a lockloss.

Images attached to this report
Comments related to this report
elenna.capote@LIGO.ORG - 22:09, Monday 28 July 2025 (86048)
Link

This lockloss is distinctively due to the same yaw ASC issue we've been having lately (see 85973 for example).

The following lockloss, that Corey hasn't had a chance to report yet, has a different behavior where the ASC oscillates for a minute or two before the lockloss. However, I see the same behavior in the TSMX osems I do for the above locklosses, which is that suddenly the F1, F2, and F3 osems see a large motion and doesn't seem to be present in the master outs. However, this lockloss seems to have a few of these large motions that cause CSOFT Y (and therefore other ASC loops) to ring down momentarily before it happens again. I see these "kicks" happen twice before the lockloss. As a reminder, the TMSX suspensions are adjusted to center the beam on the TMS QPDs for the SOFT loop feedback, so kick in the TMS suspension will likely kick the SOFT ASC which is highly cross coupled to other loops.

The attachment shows the "kicking" behavior in the TMSX osems.

Images attached to this comment
H1 INJ
matthewrichard.todd@LIGO.ORG - posted 17:19, Monday 28 July 2025 (86044)
Instructions for running ISS SECONDLOOP RIN injection script

In trying to measure the transfer functions of RIN around the interferometer, I wrote a script based off of Craig's old scripts which do these injections. If there is 25 minutes of commissioning time no one knows what to do with and we find ourselves with a locked and thermalized IFO, it would be great to run this script.

The script is not totally polished yet but essentially you can look at the yaml file I've put here and see what will be injected. When you run the script, the injection points will be activated, and then the script will turn on excitations and begin measuring the response.

The first step is to go to the repository and activate the right environment

cd /ligo/gitcommon/iss_noise_measurements
conda activate labutils

From here you can look at the injection init file I've prepared

injections_post_vent.yaml

Each of these "cells" contains a bandlimited excitation, which can be commented out to exclude from the overall injection.

By running the following line of code, you can execute the injections that are not commented out in the yaml file. Each injection should take about 25 minutes as they stand now.:

python iss_noise_injection_caller.py --file injections_post_vent.yaml 
LHO General
corey.gray@LIGO.ORG - posted 16:43, Monday 28 July 2025 (86042)
Mon Eve Ops Transition

TITLE: 07/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Earthquake
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: LARGE_EQ
    Wind: 11mph Gusts, 5mph 3min avg
    Primary useism: 1.91 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

H1 finally had an EQ lockloss (after lingering at MOVE SPOTS for just over an hour until the R-Waves finally rolled through).  Will be on-hold for a bit to wait for the Earth to stop ringing.  In other environmental news, the winds are fairly calm and microseism is low!

LHO General
ibrahim.abouelfettouh@LIGO.ORG - posted 16:31, Monday 28 July 2025 (86041)
OPS Day Shift Summary

TITLE: 07/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Earthquake
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

IFO is in DOWN due to ENVIRONMENT

While H1 itself is very well behaved, the earth today is not. Comissioning went well, though there were two locklosses, one potentially comissioner caused (lockloss alog 86023), and another caused by the ETM_GLITCH (lockloss alog 86025). 10 minutes after the second lockloss, a 6.5 EQ from malaysia hit. After that rung down, we managed to vget to MOVE_SPOTS until a 7.0 south of NZ (+aftershocks) hit.

Other than that, there have been no actual issues with locking or anything else IFO-side.
LOG:

Start Time System Name Location Lazer_Haz Task Time End
21:06 SAF LVEA IS LASER HAZARD LVEA Y LVEA IS LASER HAZARD 22:03
15:28 SUS Randy MY N Delivery 15:56
16:04 FAC Nellie Mid Y N Technical Cleaning 16:47
16:47 FAC Kim MX N Technical Cleaning 17:41
17:28 AOS Keita Optics Lab Local Picomotor inventory check 18:15
18:11 VAC Travis MX N Hauling parts 20:27
19:47 CDS Dave EX N Checking out the Dolphin switch hardware. 20:08
20:07 VAC Jordan, Gerardo, Travis LVEA Y Troubleshooting pump BSC8 20:29
21:19 VAC Gerardo FCES N Parts collection for maintenance prep 23:18
H1 SUS
filiberto.clara@LIGO.ORG - posted 14:07, Tuesday 22 July 2025 - last comment - 09:25, Tuesday 29 July 2025(85922)
Top Sat Amps Modified: MC1, MC3, and ETMY (MO, RO, TMS)

WP 12696
ECR E2400330
Drawing D0901284-v5
Modified List T2500232

The following SUS SAT Amps were upgraded per ECR E2400330. Modification improves the whitening stage to reduce ADC noise from 0.05 to 10 Hz. The EY PUM and UIM SAT Amps were NOT upgraded.

Suspension Old New OSEM
ETMY MO S1100098 S1100088 F1F2F3SD
ETMY MO/RO S1100079 S1100083 RTLF/RTLF
ETMY RO S1100087 S1000281 F1F2F3SD
TMSY S1100172 S1100148 F1F2F3LF
TMSY S1100107 S1100172 RTSD
MC1 S1100128 S1100118 T1T2T3LF
MC1/MC3 S1000292 S1000287 RTSD/T1T2
MC3 S1000297 S1100119 T3LFRTSD

F. Clara, J. Kissel, O. Patane, M. Pirello

Comments related to this report
oli.patane@LIGO.ORG - 14:27, Tuesday 22 July 2025 (85924)
Link

Once the new satamps were installed, I ran the script satampswap_bestpossible_filterupdate_ECR_E2400330.py to update the compensation filters for these suspensions. These 'best possible' compensation gains come from the tests Jeff did on each satamp before installation, which are found in /ligo/svncommon/SusSVN/sus/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/.

My input and the corresponding output is below:


oli.patane@cdsws27:/ligo/svncommon/SusSVN/sus/trunk/Common/PythonTools$ py satampswap_bestpossible_filterupdate_ECR_E2400330.py -o TMSY ETMY_M0_R0
All updated filters grabbed for TMSY
TMSY M1 F1 compensation filter updated to zpk([5.3],[0.0969],1,"n")
TMSY M1 F2 compensation filter updated to zpk([5.28],[0.0964],1,"n")
TMSY M1 F3 compensation filter updated to zpk([5.2],[0.095],1,"n")
TMSY M1 LF compensation filter updated to zpk([5.26],[0.096],1,"n")
TMSY M1 RT compensation filter updated to zpk([5.17],[0.0945],1,"n")
TMSY M1 SD compensation filter updated to zpk([5.26],[0.0961],1,"n")
write /opt/rtcds/userapps/release/sus/h1/filterfiles/H1SUSTMSY.txt
Done writing updated filters for TMSY

All updated filters grabbed for ETMY
ETMY R0 F1 compensation filter updated to zpk([5.2],[0.0951],1,"n")
ETMY R0 F2 compensation filter updated to zpk([5.2],[0.0951],1,"n")
ETMY R0 F3 compensation filter updated to zpk([5.25],[0.0959],1,"n")
ETMY R0 SD compensation filter updated to zpk([5.35],[0.098],1,"n")
ETMY M0 F1 compensation filter updated to zpk([5.31],[0.0971],1,"n")
ETMY M0 F2 compensation filter updated to zpk([5.27],[0.0965],1,"n")
ETMY M0 F3 compensation filter updated to zpk([5.22],[0.0955],1,"n")
ETMY M0 SD compensation filter updated to zpk([5.17],[0.0946],1,"n")
ETMY M0 LF compensation filter updated to zpk([5.2],[0.0951],1,"n")
ETMY M0 RT compensation filter updated to zpk([5.28],[0.0965],1,"n")
ETMY R0 LF compensation filter updated to zpk([5.29],[0.0967],1,"n")
ETMY R0 RT compensation filter updated to zpk([5.26],[0.0962],1,"n")
write /opt/rtcds/userapps/release/sus/h1/filterfiles/H1SUSETMY.txt
Done writing updated filters for ETMY

All done! Remember to double check and load in the filters for ['TMSY', 'ETMY_M0_R0']

oli.patane@cdsws27:/ligo/svncommon/SusSVN/sus/trunk/Common/PythonTools$ py satampswap_bestpossible_filterupdate_ECR_E2400330.py -o MC1 MC3
All updated filters grabbed for MC1
MC1 M1 RT compensation filter updated to zpk([5.13],[0.0937],1,"n")
MC1 M1 SD compensation filter updated to zpk([5.25],[0.096],1,"n")
MC1 M1 T1 compensation filter updated to zpk([5.26],[0.0962],1,"n")
MC1 M1 T2 compensation filter updated to zpk([5.18],[0.0947],1,"n")
MC1 M1 T3 compensation filter updated to zpk([5.32],[0.0972],1,"n")
MC1 M1 LF compensation filter updated to zpk([5.12],[0.0938],1,"n")
write /opt/rtcds/userapps/release/sus/h1/filterfiles/H1SUSMC1.txt
Done writing updated filters for MC1

All updated filters grabbed for MC3
MC3 M1 T3 compensation filter updated to zpk([5.32],[0.0972],1,"n")
MC3 M1 LF compensation filter updated to zpk([5.19],[0.0949],1,"n")
MC3 M1 RT compensation filter updated to zpk([5.35],[0.0979],1,"n")
MC3 M1 SD compensation filter updated to zpk([5.19],[0.0949],1,"n")
MC3 M1 T1 compensation filter updated to zpk([5.31],[0.097],1,"n")
MC3 M1 T2 compensation filter updated to zpk([5.24],[0.0958],1,"n")
write /opt/rtcds/userapps/release/sus/h1/filterfiles/H1SUSMC3.txt
Done writing updated filters for MC3

All done! Remember to double check and load in the filters for ['MC1', 'MC3']

After this I loaded in these new filters.

jeffrey.kissel@LIGO.ORG - 15:40, Monday 28 July 2025 (86037)
Link 

The serial numbers in Fil's and OLD and NEW columns are flip flopped in the main aLOG, LHO:85922.

Here's the corrected version with the serial number's columns flipped to reflect reality.

Suspension	Old         New	           OSEM
ETMY MO	        S1100088    S1100098       F1F2F3SD

ETMY MO/RO	S1100083    S1100079       RTLF/RTLF

ETMY RO	        S1000281    S1100087       F1F2F3SD

TMSY	        S1100148    S1100172       F1F2F3LF

TMSY	        S1100172    S1100107       RTSD

MC1	        S1100118    S1100128       T1T2T3LF

MC1/MC3	        S1000287    S1000292       RTSD/T1T2

MC3	        S1100119    S1000297       T3LFRTSD
jeffrey.kissel@LIGO.ORG - 15:47, Monday 28 July 2025 (86038)
Link 

Here's the characterization data and fit results for  S1100098 , assigned to ETMY M0's F1F2F3SD OSEMs (Fil refers to this as ETMY MO F1F2F3SD above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100098_ETMY_M0_F1F2F3SD_20250717.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
ETMY     M0       S1100098         CH1                F1           0.0971:5.31     120           zpk([5.31],[0.0971],1,"n")
                                   CH2	              F2           0.0965:5.27     120           zpk([5.27],[0.0965],1,"n")
                                   CH3	              F3           0.0955:5.22     120           zpk([5.22],[0.0955],1,"n")
                                   CH4	              SD           0.0946:5.17     120           zpk([5.17],[0.0946],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm, as it's not used in the compensation filter -- but also because the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by just adjusting the zero frequency.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 15:51, Monday 28 July 2025 (86039)
Link 

Here's the characterization data and fit results for  S1100079 , assigned to ETMY M0/R0's LFRT/LFRT OSEMs (Fil refers to this as ETMY MO/RO RTLF/RTLF above -- note his typo in channel order).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100079_ETMY_M0R0_LFRTLFRT_20250717.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
ETMY     M0       S1100079	   CH1                LF           0.0951:5.20     120           zpk([5.20],[0.0951],1,"n")
         M0                        CH2                RT           0.0965:5.28     120           zpk([5.28],[0.0965],1,"n")
         R0                        CH3                LF           0.0967:5.29     120           zpk([5.29],[0.0967],1,"n")
         R0                        CH4                RT           0.0962:5.26     120           zpk([5.26],[0.0962],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm, as it's not used in the compensation filter -- but also because the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by just adjusting the zero frequency.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 15:56, Monday 28 July 2025 (86040)
Link 

Here's the characterization data and fit results for  S1100087 , assigned to ETMY R0's F1F2F3SD OSEMs (Fil refers to this as ETMY RO F1F2F3SD above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100087_ETMY_R0_F1F2F3SD_20250717.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
ETMY     R0       S1100087         CH1                F1           0.0951:5.20     120           zpk([5.20],[0.0951],1,"n")
                                   CH2                F2           0.0951:5.20     120           zpk([5.20],[0.0951],1,"n")
                                   CH3                F3           0.0959:5.25     120           zpk([5.25],[0.0959],1,"n")
                                   CH4                SD           0.0980:5.35     120           zpk([5.35],[0.0980],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm, as it's not used in the compensation filter -- but also because the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by just adjusting the zero frequency.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 08:38, Tuesday 29 July 2025 (86053)
Link 

Here's the characterization data and fit results for  S1100172 , assigned to TMSY M1's F1F2F3LF OSEMs (Fil refers to this as TMSY F1F2F3LF above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100172_TMSY_M1_F1F2F3LF_20250717.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
TMSY     M1       S1100172         CH1                F1           0.0969:5.30     120           zpk([5.30],[0.0969],1,"n")
                                   CH2                F2           0.0964:5.28     120           zpk([5.28],[0.0964],1,"n")
                                   CH3                F3           0.0950:5.20     120           zpk([5.20],[0.0950],1,"n")
                                   CH4                LF           0.0960:5.26     120           zpk([5.26],[0.0960],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 08:42, Tuesday 29 July 2025 (86054)
Link 

Here's the characterization data and fit results for  S1100107 , assigned to TMSY M1's RTSDxxxx OSEMs (Fil refers to this as TMSY RTSD above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100107_TMSY_M1_RTSDxxxx_20250717.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
TMSY     M1       S1100107         CH1                RT           0.0945:5.17     120           zpk([5.17],[0.0945],1,"n")
                                   CH2                SD           0.0961:5.26     120           zpk([5.26],[0.0961],1,"n")
                                   CH3                xx           0.0956:5.23     120           zpk([5.23],[0.0956],1,"n")
                                   CH4                xx           0.0957:5.24     120           zpk([5.24],[0.0957],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 09:14, Tuesday 29 July 2025 (86055)
Link 

Here's the characterization data and fit results for  S1100128 , assigned to MC1 M1's T1T2T3LF OSEMs (Fil refers to this as MC1 T1T2T3LF above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100128_MC1_M1_T1T2T3LF_20250717.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
MC1      M1       S1100128         CH1                T1           0.0962:5.26     120           zpk([5.26],[0.0962],1,"n")
                                   CH2                T2           0.0947:5.18     120           zpk([5.18],[0.0947],1,"n")
                                   CH3                T3           0.0972:5.32     120           zpk([5.32],[0.0972],1,"n")
                                   CH4                LF           0.0938:5.12     120           zpk([5.12],[0.0938],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 09:19, Tuesday 29 July 2025 (86057)
Link 

Here's the characterization data and fit results for  S1000292 , assigned to MC1/MC3 M1's RTSD/T1T2 OSEMs (Fil refers to this as MC1/MC3 RTSD/T1T2 above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1000292_MC1MC3_M1_RTSDT1T2_20250717.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
MC1      M1       S1000292         CH1                RT           0.0937:5.13     120           zpk([5.13],[0.0937],1,"n")
MC1      M1                        CH2                SD           0.0960:5.25     120           zpk([5.25],[0.0960],1,"n")
MC3      M1                        CH3                T1           0.0970:5.31     120           zpk([5.31],[0.0970],1,"n")
MC3      M1                        CH4                T2           0.0958:5.24     120           zpk([5.24],[0.0958],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 09:25, Tuesday 29 July 2025 (86058)
Link 

Here's the characterization data and fit results for  S1000297 , assigned to MC3 M1's T3LFRTSD OSEMs (Fil refers to this as MC3 T3LFRTSD above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1000297_MC3_M1_T3LFRTSD_20250721.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
MC3      M1       S1000297         CH1                T3           0.0972:5.32     120           zpk([5.32],[0.0972],1,"n")
                                   CH2                LF           0.0949:5.19     120           zpk([5.19],[0.0949],1,"n")
                                   CH3                RT           0.0979:5.35     120           zpk([5.35],[0.0979],1,"n")
                                   CH4                SD           0.0949:5.19     120           zpk([5.19],[0.0949],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
H1 SUS
filiberto.clara@LIGO.ORG - posted 13:02, Tuesday 15 July 2025 - last comment - 15:19, Monday 28 July 2025(85770)
Top Sat Amps Modified: MC2/PR2/ETMX (MO, RO, UIM, and TMS)

WP 12675
WP 12676
ECR E2400330
Drawing D0901284-v5
Modified List T2500232

The following SUS SAT Amps were upgraded per ECR E2400330. Modification improves the whitening stage to reduce ADC noise from 0.05 to 10 Hz. The EX PUM SAT Amp was NOT upgraded. 

Suspension Old New OSEM
ETMX MO S1100128 S1100075 F1F2F3SD
ETMX MO/RO S1100079 S1100163 RTLF/RTLF
ETMX RO S1100149 S1100132 F1F2F3SD
ETMX UIM S1000297 S1100140 ULLLURLR
TMSX S1100098 S1100150 F1F2F3LF
TMSX S1000292 S1100058 RTSD
MC2 S1100107 S1100071 T1T2T3LF
MC2/PR2 S1100087 S1100147 RTSD/T1T2
PR2 S1100172 S1100121 T3LFRTSD


F. Clara,  J. Kissel

Comments related to this report
oli.patane@LIGO.ORG - 17:29, Thursday 24 July 2025 (85981)
Link

As of 2025/07/25 00:00 UTC, the TMSX satamp box for F1/F2/F3/LF has been swapped from S1100150 to S1100122

See 85980 for more info

jeffrey.kissel@LIGO.ORG - 14:16, Monday 28 July 2025 (86028)
Link 

Here's the characterization data and fit results for  S1100075 , assigned to ETMX M0's F1F2F3SD OSEMs (Fil refers to this as ETMX MO F1F2F3SD).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100075_ETMX_M0_F1F2F3SD_20250710.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
ETMX     M0       S1100075         CH1                F1           0.0971:5.31     120           zpk([5.31],[0.0971],1,"n")
                                   CH2                F2           0.0973:5.33     120           zpk([5.33],[0.0973],1,"n")
                                   CH3                F3           0.0979:5.36     120           zpk([5.36],[0.0979],1,"n")
                                   CH4                SD           0.0953:5.21     120           zpk([5.21],[0.0953],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 discusses, I'm intentionally excluding the fit of transimpedance gain from the foton design string, and so I've stopped using the R_TIA_kOhm as a knob in my by-hand fitting of the zeros and poles. Hence, you'll find that from here on, R_TIA_kOhm will almost always be the default 120 kOhm value I've found that works with the measured data and changing only the zero:pole frequency.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 14:16, Monday 28 July 2025 (86029)
Link 

Here's the characterization data and fit results for  S1100163 , assigned to ETMX M0/R0's LFRT/LFRT OSEMs (Fil refers to this as ETMX MO/RO RTLF/RTLF above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100163_ETMX_M0R0_LFRTLFRT_20250710.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
ETMX     M0R0      S1100163        CH1                LF           0.0948:5.18     120           zpk([5.18],[0.0948],1,"n")
                                   CH2                RT           0.0954:5.21     120           zpk([5.21],[0.0954],1,"n")
                                   CH3                LF           0.0969:5.30     120           zpk([5.30],[0.0969],1,"n")
                                   CH4                RT           0.0947:5.17     120           zpk([5.17],[0.0947],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 14:33, Monday 28 July 2025 (86030)
Link 

Here's the characterization data and fit results for  S1100132 , assigned to ETMX R0's F1F2F3SD OSEMs (Fil refers to this as ETMX RO F1F2F3SD above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100132_ETMX_R0_F1F2F3SD_20250710.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
ETMX     R0        S1100132        CH1                F1           0.0943:5.17     120.75        zpk([5.17],[0.0943],1,"n")
                                   CH2                F2           0.0960:5.25     121.00        zpk([5.25],[0.0960],1,"n")
                                   CH3                F3           0.0963:5.28     121.25        zpk([5.28],[0.0963],1,"n")
                                   CH4                SD           0.0970:5.33     120.75        zpk([5.33],[0.0970],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

This sat amp actually needed some fit transimpedance gain, so I report it here. But, again, it's not used in the compensation filter.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 14:50, Monday 28 July 2025 (86031)
Link 

Here's the characterization data and fit results for  S1100140 , assigned to ETMX L1's ULLLURLR OSEMs (Fil refers to this as ETMX UIM ULLLURLR above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100140_ETMX_L1_ULLLURLR_20250715.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
ETMX     L1       S1100140         CH1                UL           0.0943:5.14     120.5         zpk([5.14],[0.0943],1,"n")
                                   CH2                LL           0.0965:5.26     120.5         zpk([5.26],[0.0965],1,"n")
                                   CH3                UR           0.0943:5.14     120.5         zpk([5.14],[0.0943],1,"n")
                                   CH4                LR           0.0961:5.24     120.5         zpk([5.24],[0.0961],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

Similar to S1100132, I found I needed to slightly adjust the transimpedance to get a good phase fit of the zero frequency while getting magnitude scale to the ~1.000 +/- 0.005 level. Again, this won't be used in the compensation filter.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 14:55, Monday 28 July 2025 (86032)
Link 

Here's the characterization data and fit results for  S1100122 , which -- per LHO:85981, LHO:85980 and after 2025-07-25, has been assigned to TMSX M1's F1F2F3LF OSEMs (Fil refers to this as just TMSX F1F2F3LF above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100122_TMSX_M1_F1F2F3LF_20250724.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
TMSX     M1       S1100122         CH1                F1           0.0962:5.26     120           zpk([5.26],[0.0962],1,"n")
                                   CH2                F2           0.0971:5.31     120           zpk([5.31],[0.0971],1,"n")
                                   CH3                F3           0.0957:5.24     120           zpk([5.24],[0.0957],1,"n")
                                   CH4                LF           0.0951:5.20     120           zpk([5.20],[0.0951],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 15:06, Monday 28 July 2025 (86033)
Link 

Here's the characterization data and fit results for  S1100058 , assigned to TMSX M1's RTSD OSEMs and CH3CH4 are not connected to any OSEM in-vacuum, hence the "xxxx" place holders (Fil refers to this as just TMSX RTSD above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100058_TMSX_M1_RTSDxxxx_20250708.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
TMSX     M1       S1100058         CH1                RT           0.0939:5.11     121           zpk([5.11],[0.0939],1,"n")
                                   CH2                SD           0.0960:5.25     120           zpk([5.25],[0.0960],1,"n")
                                   CH3                xx           0.0955:5.23     120           zpk([5.23],[0.0955],1,"n")
                                   CH4                xx           0.0961:5.25     120           zpk([5.25],[0.0961],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is (mostly) the default 120 kOhm, save for CH1.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 15:11, Monday 28 July 2025 (86034)
Link 

Here's the characterization data and fit results for  S1100071 , assigned to MC2 M1's T1T2T3LF OSEMs (Fil refers to this as just MC2 T1T2T3LF above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100071_MC2_M1_T1T2T3LF_20250710.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
MC2      M1       S1100071         CH1                T1           0.0977:5.34     120           zpk([5.34],[0.0977],1,"n")
                                   CH2                T2           0.0956:5.23     120           zpk([5.23],[0.0956],1,"n")
                                   CH3                T3           0.0948:5.18     120           zpk([5.18],[0.0948],1,"n")
                                   CH4                LF           0.0958:5.22     120           zpk([5.22],[0.0958],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 15:15, Monday 28 July 2025 (86035)
Link 

Here's the characterization data and fit results for  S1100147 , assigned to MC2/PR2 M1's RTSD/T1T2 OSEMs (Fil refers to this as just MC2/PR2 RTSD/T1T2 above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100147_MC2PR2_M1_RTSDT1T2_20250710.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
MC2      M1       S1100147         CH1                RT           0.0975:5.33     120           zpk([5.33],[0.0975],1,"n")
MC2      M1                        CH2                SD           0.0947:5.18     120           zpk([5.18],[0.0947],1,"n")
PR2      M1                        CH3                T1           0.0969:5.29     120           zpk([5.29],[0.0969],1,"n")
PR2      M1                        CH4                T2           0.0962:5.25     120           zpk([5.25],[0.0962],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 15:19, Monday 28 July 2025 (86036)
Link 

Here's the characterization data and fit results for  S1100121 , assigned to PR2 M1's T3LFRTSD OSEMs (Fil refers to this as just PR2 T3LFRTSD above).
The data was taken per methods described in T080062-v3.
The data was processed and fit using 
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100121_PR2_M1_T3LFRTSD_20250710.m

Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are
Optic    Stage    Serial_Number    Channel_Number     OSEM_Name    Zero_Pole_Hz    R_TIA_kOhm    Foton_Design
PR2      M1       S1100121         CH1                T3           0.0979:5.37     120           zpk([5.37],[0.0979],1,"n")
                                   CH2                LF           0.0967:5.29     120           zpk([5.29],[0.0967],1,"n")
                                   CH3                RT           0.0958:5.24     120           zpk([5.24],[0.0958],1,"n")
                                   CH4                SD           0.0969:5.31     120           zpk([5.31],[0.0969],1,"n")
  
The attached plot and machine readable .txt file version of the above table are also found in
${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/

As LHO:85626 and the above LHO:86028 discusses, R_TIA_kOhm is the default 120 kOhm.
Non-image files attached to this comment
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