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Reports until 11:31, Tuesday 30 September 2025
H1 SUS
filiberto.clara@LIGO.ORG - posted 11:31, Tuesday 30 September 2025 - last comment - 15:59, Monday 13 October 2025(87225)
Sat Amps Modified: PR2 and SR2

WP 12813
ECR E2400330
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.

Suspension Old New OSEM
PR2 M2 S1100174 S1100159 ULLLURLR
PR2 M3 S1100093 S1100141 ULLLURLR
SR2 M2 S1100169 S1100070 ULLLURLR
SR2 M3 S1100134 S1000295 ULLLURLR

F. Clara, J. Kissel, O. Patane

Comments related to this report
oli.patane@LIGO.ORG - 15:21, Thursday 02 October 2025 (87237)
Link

(Since Jeff is out of town, I'm putting these in for these swaps.)

Here's the characterization data and fit results for S1100159, assigned to PR2 M2's ULLLURLR OSEMs.

This sat amp is a UK 4CH sat amp, D0900900 / D0901284.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.

The data was processed and fit using
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100159_PR2_M2_ULLLURLR_20250924.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      M2       S1100159         CH1                UL           0.0956:5.22      120.25    "zpk([5.22],[0.0956],1,""n"")"
                                   CH2                LL           0.0967:5.28      120       "zpk([5.28],[0.0967],1,""n"")"
                                   CH3                UR           0.0978:5.34      120       "zpk([5.34],[0.0978],1,""n"")"
                                   CH4                LR           0.0969:5.3       120       "zpk([5.3],[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/Results/

Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), I nudged the transimpedance a bit to get the magnitude scale within the ~0.25%. shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Non-image files attached to this comment
oli.patane@LIGO.ORG - 15:19, Thursday 02 October 2025 (87262)
Link

(Since Jeff is out of town, I'm putting these in for these swaps.)

Here's the characterization data and fit results for S1100141, assigned to PR2 M3's ULLLURLR OSEMs.

This sat amp is a UK 4CH sat amp, D0900900 / D0901284.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.

The data was processed and fit using
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100141_PR2_M3_ULLLURLR_20250924.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      M3       S1100141         CH1                UL           0.0957:5.22    120.25    "zpk([5.22],[0.0957],1,""n"")"
                                   CH2                LL           0.0949:5.17    120.5    "zpk([5.17],[0.0949],1,""n"")"
                                   CH3                UR           0.0977:5.33    120.375    "zpk([5.33],[0.0977],1,""n"")"
                                   CH4                LR           0.0946:5.16    120.25    "zpk([5.16],[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/Results/

Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), I nudged the transimpedance a bit to get the magnitude scale within the ~0.25%. shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Non-image files attached to this comment
oli.patane@LIGO.ORG - 15:24, Thursday 02 October 2025 (87263)
Link

(Since Jeff is out of town, I'm putting these in for these swaps.)

Here's the characterization data and fit results for S1100070, assigned to SR2 M2's ULLLURLR OSEMs.

This sat amp is a UK 4CH sat amp, D0900900 / D0901284.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.

The data was processed and fit using
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1100070_SR2_M2_ULLLURLR_20250924.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
SR2      M2       S1100070         CH1                UL           0.0961:5.24    120.25    "zpk([5.24],[0.0961],1,""n"")"
                                   CH2                LL           0.0965:5.27    120.375    "zpk([5.27],[0.0965],1,""n"")"
                                   CH3                UR           0.0961:5.23    120.5    "zpk([5.23],[0.0961],1,""n"")"
                                   CH4                LR           0.0963:5.26    120.75    "zpk([5.26],[0.0963],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/Results/

Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), I nudged the transimpedance a bit to get the magnitude scale within the ~0.25%. shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Non-image files attached to this comment
oli.patane@LIGO.ORG - 15:26, Thursday 02 October 2025 (87264)
Link

(Since Jeff is out of town, I'm putting these in for these swaps.)

Here's the characterization data and fit results for S1000295, assigned to SR2 M3's ULLLURLR OSEMs.

This sat amp is a UK 4CH sat amp, D0900900 / D0901284.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.

The data was processed and fit using
    ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
         plotresponse_S1000295_SR2_M3_ULLLURLR_20250924.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
SR2      M3       S1000295         CH1                UL           0.0964:5.27    121.75    "zpk([5.27],[0.0964],1,""n"")"
                                   CH2                LL           0.0954:5.21    121.625    "zpk([5.21],[0.0954],1,""n"")"
                                   CH3                UR           0.0955:5.22    121.375    "zpk([5.22],[0.0955],1,""n"")"
                                   CH4                LR           0.0964:5.26    122    "zpk([5.26],[0.0964],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/Results/

Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), I nudged the transimpedance a bit to get the magnitude scale within the ~0.25%. shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Non-image files attached to this comment
LHO VE
david.barker@LIGO.ORG - posted 10:41, Tuesday 30 September 2025 (87223)
Tue CP1 Fill

Tue Sep 30 10:09:27 2025 INFO: Fill completed in 9min 24secs

 

Images attached to this report
H1 ISC
matthewrichard.todd@LIGO.ORG - posted 10:08, Tuesday 30 September 2025 - last comment - 13:27, Wednesday 01 October 2025(87221)
Measurements of IMC ASC DOFs coupling to RIN

M. Todd

Summary

This morning I used the early maintenance day to come in and make some measurements of IMC DOF Transfer Functions to ISS Second Loop RIN. I started by doing some OPS/GRD settings as I was here about an hour before the operator was set to come in.

I got through the first DOF measurement (DOF_1_P) without any hiccups; however a 7.0 earthquake from Philippines came in an unlocked us. Fortunately, I did not have to wait long for the IMC to relock and I proceeded with the other measurements.

DOF 1 and DOF 2 are relatively robust, but upon starting the DOF 3 measurement I had to lower the gain even more than anticipated, as the 1 and 3 Hz resonances are quite strong. The first run at this unlocked the IMC. After clearing the IMC DOF 3 P history, I let the IMC relock (it was having trouble) and continued with the subdued measurements.

I also tried to measure the UGF of each DOF loop, but was nervous about injecting that hard at the frequencies I suspected would contain the UGF.

Later, I will post a comment that tries to map the quiet time IMC contributions to the ISS Outer RIN in the regions we have enough coherence.

List of Figures

  1. DOF 1 P Measurement of IMC to ISS 2ND LOOP RIN
  2. DOF 1 Y Measurement of IMC to ISS 2ND LOOP RIN 
  3. DOF 2 P Measurement of IMC to ISS 2ND LOOP RIN
  4. DOF 2 Y Measurement of IMC to ISS 2ND LOOP RIN
  5. DOF 3 P Measurement of IMC to ISS 2ND LOOP RIN
  6. DOF 3 Y Measurement of IMC to ISS 2ND LOOP RIN
Images attached to this report
Comments related to this report
matthewrichard.todd@LIGO.ORG - 13:27, Wednesday 01 October 2025 (87250)
Link

I'm adding a plot of projections of the quiescent noise in each IMC DOF loop to the ISS second loop. Note, I've cut off the TFs above 3 Hz due to coherence loss.

Non-image files attached to this comment
H1 CDS
erik.vonreis@LIGO.ORG - posted 09:59, Tuesday 30 September 2025 (87222)
Laptop update and search at the end stations

[Tony, Erik]

We updated laptops at both end stations and looked for laptops left lying around.   We found one disconnected Zotac in the CER at EY and brought it back to the corner station as a spare.

H1 TCS
thomas.shaffer@LIGO.ORG - posted 09:58, Tuesday 30 September 2025 (87219)
TCS sock filters replaced

FAMIS31407

Swapped the filters in the two chillers while they were running this morning. There was slight discoloration in both. The mesh diffusers/flow straighteners had some gunk buildup in them. I have some that should have arrived today that I will put in later.

H1 CDS (SUS)
erik.vonreis@LIGO.ORG - posted 09:57, Tuesday 30 September 2025 - last comment - 10:43, Tuesday 30 September 2025(87218)
ETMX Hardware Watchdog Verified

[Tony, Erik]

We verified that the ETMX hardware watchdog started to count down when the connection from the satellite amps for ETMX was removed.

Comments related to this report
david.barker@LIGO.ORG - 10:43, Tuesday 30 September 2025 (87224)
Link

Images attached to this comment
H1 CDS
david.barker@LIGO.ORG - posted 09:10, Tuesday 30 September 2025 (87217)
Fire pumps testing, cell phone alarms have been bypassed for the duration of the test.

Bypass will expire:
Tue Sep 30 12:08:51 PM PDT 2025
For channel(s):
    H0:FMC-CS_FIRE_PUMP_1
    H0:FMC-CS_FIRE_PUMP_2
 

H1 SQZ
camilla.compton@LIGO.ORG - posted 08:50, Tuesday 30 September 2025 (87215)
Using all Avaliable SHG Green Power

At the weekend, Ryan reduced the OPO Trans Setpoint form 80uW to 75uW. Today I used the SQZT0 SHG waveplates to maximize the power available to the Pump and then I minimized rejected HAM7 power. After doing these, with the OPO locked at 75uW, the OPO_ISS control mon is at 2.5V, it is unhappy normally when below 2.0V. I am able to lock the OPO with 80uW OPO trans setpoint, but the OPO ISS controlmon is at 1.4V so probably wouldn't last very long. Leaving with the 75uW setpoint. 

NLG as per 76542:

OPO Setpoint Amplified Max Amplified Min UnAmp Dark NLG
75 0.0103676 0.000175 0.0005591 -1.1e-5 18.2
H1 CDS
david.barker@LIGO.ORG - posted 08:03, Tuesday 30 September 2025 - last comment - 08:47, Tuesday 30 September 2025(87212)
h1hpiham6 new model prepped and ready for restart.

WP12814

Jim, Erik, Dave:

I have rev-locked built and installed Jim's new h1hpiham6 model. This is an internal ADC rewiring of 4 channels, no DAQ restart needed. We will restart the model later this morning when Jim completes his chamber side wiring work.

Comments related to this report
david.barker@LIGO.ORG - 08:47, Tuesday 30 September 2025 (87216)
Link

Jim put HEPI HAM6 into a safe state and we installed the new model at 08:40 PDT. No DAQ restart was required, I just had to clear the DAQ CRCs and DIAG_RESET the latched IPCs.

For a check, I was viewing the filter module MEDMs for WITNESS_P1 and 3DL4C_A_X. With the old code the witness was seeing around 700 counts and A_X zero, with the new code this was reversed, as expected.

LHO General
thomas.shaffer@LIGO.ORG - posted 07:49, Tuesday 30 September 2025 - last comment - 08:22, Tuesday 30 September 2025(87210)
Ops Day Shift Start

 TITLE: 09/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Earthquake
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: EARTHQUAKE
    Wind: 17mph Gusts, 14mph 3min avg
    Primary useism: 1.28 μm/s
    Secondary useism: 0.57 μm/s 
QUICK SUMMARY: Lost lock just a bit ago due to a 6.9 earthquake in the Philippines. Maintenance starting a bit earlier because of this. 

Comments related to this report
thomas.shaffer@LIGO.ORG - 07:55, Tuesday 30 September 2025 (87211)SQZ
Link

Looks like the SQZer unlocked at 1216 UTC this morning, relocking again and gettting back into Observing at 1220 UTC.

camilla.compton@LIGO.ORG - 08:22, Tuesday 30 September 2025 (87213)SQZ
Link

Reason for SQZ unlock was PMC PZT getting to the end of it's range at 100V. 

H1 General
oli.patane@LIGO.ORG - posted 06:17, Tuesday 30 September 2025 (87209)
OWL call due to Tuesday morning excitations

H1 Manager just called to tell me that we've been out of Observing for a bit. I know we recently bumped up the times for the Tuesday morning measurements to run, and that's why we're out of Observing, so I'm ignoring H1 Manager's call for help.

H1 CDS
erik.vonreis@LIGO.ORG - posted 05:33, Tuesday 30 September 2025 (87208)
Workstations updated

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

LHO General
corey.gray@LIGO.ORG - posted 21:59, Monday 29 September 2025 (87206)
Mon EVE Ops Summary

TITLE: 09/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

Quiet shift with only a brief (& easy) drop from Observing due to SQZ.

Otherwise, locked the entire shift for a lock going on 21.75hrs (so no opportunities to shutt of Annulus Ion Pumps for HAM5/6).
LOG:

H1 SQZ
corey.gray@LIGO.ORG - posted 17:45, Monday 29 September 2025 - last comment - 08:36, Tuesday 30 September 2025(87207)
SQZ Drops H1 From Observing For About 11min

At the top of the hour (within 15seconds), the Squeezer unlocked and took H1 down.  Tony was in here and thought the timing was odd with it happening close to the top of the hour!  (he saw that the PMC went down at 00:00:15).  

The Log for the SQZ MANAGER also notes the PMC as the cause (w/ a message of "LO railing!").

I slowly got SQZ windows opened & got the wiki up and started recovery by Steps:

Images attached to this report
Comments related to this report
camilla.compton@LIGO.ORG - 08:36, Tuesday 30 September 2025 (87214)
Link

Reason for SQZ unlock was PMC PZT getting to the end of it's range at 0V.

The FC Trans level in the wiki was a red herring (has been corrected), we're unsure why it has dropped so much in the past few months, plot. 

Images attached to this comment
H1 General
ryan.crouch@LIGO.ORG - posted 16:32, Monday 29 September 2025 (87201)
OPS Monday day shift summary

TITLE: 09/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We stayed locked the whole shift, 16 hours.
LOG:                                                                                                                                                 

Start Time System Name Location Lazer_Haz Task Time End
16:48 VAC Pump LVEA N AIP pumping on HAM6 ongoing
15:33 PEM Robert, Anamaria LVEA N Set up PEM measurements 16:26
16:04 FAC Randy Xarm, before Mid N Inspections, power washing X1 midpoint 21:29
16:16 FAC Nellie MidY N Tech clean 17:16
17:15 CAL Tony PCAL lab LOCAL Turn on lights 17:18
17:40 PEM Robert LVEA N Change measurement 17:55
17:56 FAC Chris Optics lab N Look for bags 18:04
21:15 JAC Corey Vac prep lab N JAC table 23:14
Displaying reports 821-840 of 85564.Go to page Start 38 39 40 41 42 43 44 45 46 End