Reports until 14:39, Tuesday 21 October 2025
H1 SUS (SUS)
filiberto.clara@LIGO.ORG - posted 14:39, Tuesday 21 October 2025 - last comment - 21:26, Tuesday 28 October 2025(87620)
Sat Amps Modified: Lower Stages MC1, MC2, MC3, PR3, and SR3

WP 12844
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
MC1 M2 S1100182 S1100148 ULLLURLR
MC1 M3 S1100176 S1100135 ULLLURLR
MC3 M2 S1100069 S1100106 ULLLURLR
MC3 M3 S1100123 S1100093 ULLLURLR
PR3 M2 S1100063 S1000274 ULLLURLR
PR3 M3 S1100113 S1000277 ULLLURLR
MC2 M2 S1100110 S1100169 ULLLURLR
MC2 M3 S1000294 S1100174 ULLLURLR
SR3 M2 S1100105 S1100146 ULLLURLR
SR3 M3 S1100074 S1100134 ULLLURLR

F. Clara, J. Kissel, O. Patane

Comments related to this report
oli.patane@LIGO.ORG - 21:19, Tuesday 28 October 2025 (87816)

Here's the characterization data and fit results for S1100148, assigned to MC1 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_S1100148_MC1_M2_ULLLURLR_20251020.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 M2 S1100148 CH1 UL 0.0949:5.19 120.3 zpk([5.19],[0.0949],1,"n")
      CH2 LL 0.0961:5.24 120.5 zpk([5.24],[0.0961],1,"n")
      CH3 UR 0.0962:5.25 120.5 zpk([5.25],[0.0962],1,"n")
      CH4 LR 0.0967:5.27 120.375 zpk([5.27],[0.0967],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/
2025-10-20_UKSatAmp_S1100148_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:21, Tuesday 28 October 2025 (87817)

Here's the characterization data and fit results for S1100135, assigned to MC1 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_S1100135_MC1_M3_ULLLURLR_20251020.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 M3 S1100135 CH1 UL 0.0955:5.21 120.25 zpk([5.21],[0.0955],1,"n")
      CH2 LL 0.0962:5.25 120.25 zpk([5.25],[0.0962],1,"n")
      CH3 UR 0.0973:5.31 120.125 zpk([5.31],[0.0973],1,"n")
      CH4 LR 0.097:5.3 120.125 zpk([5.3],[0.097],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/
2025-10-20_UKSatAmp_S1100135_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:21, Tuesday 28 October 2025 (87818)

Here's the characterization data and fit results for S1100106, assigned to MC3 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_S1100106_MC3_M2_ULLLURLR_20251020.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 
MC3 M2 S1100106 CH1 UL 0.0978:5.34 120.25 zpk([5.34],[0.0978],1,"n")
      CH2 LL 0.096:5.24 120.5 zpk([5.24],[0.096],1,"n")
      CH3 UR 0.0973:5.32 120.125 zpk([5.32],[0.0973],1,"n")
      CH4 LR 0.0955:5.21 120.5 zpk([5.21],[0.0955],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/
2025-10-20_UKSatAmp_S1100106_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:22, Tuesday 28 October 2025 (87819)

Here's the characterization data and fit results for S1100093, assigned to MC3 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_S1100093_MC3_M3_ULLLURLR_20251020.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 
MC3 M3 S1100093 CH1 UL 0.0966:5.28 120.0 zpk([5.28],[0.0966],1,"n")
      CH2 LL 0.099:5.4 120.375 zpk([5.4],[0.099],1,"n")
      CH3 UR 0.0969:5.3 120.0 zpk([5.3],[0.0969],1,"n")
      CH4 LR 0.0966:5.28 120.125 zpk([5.28],[0.0966],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/
2025-10-20_UKSatAmp_S1100093_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:23, Tuesday 28 October 2025 (87820)

Here's the characterization data and fit results for S1000274, assigned to PR3 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_S1000274_PR3_M2_ULLLURLR_20251020.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 
PR3 M2 S1000274 CH1 UL 0.0947:5.17 120.25 zpk([5.17],[0.0947],1,"n")
      CH2 LL 0.0961:5.24 120.25 zpk([5.24],[0.0961],1,"n")
      CH3 UR 0.0963:5.26 120.0 zpk([5.26],[0.0963],1,"n")
      CH4 LR 0.0962:5.25 120.25 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/Results/
2025-10-20_UKSatAmp_S1000274_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:24, Tuesday 28 October 2025 (87821)

Here's the characterization data and fit results for S1000277, assigned to PR3 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_S1000277_PR3_M3_ULLLURLR_20251020.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 
PR3 M3 S1000277 CH1 UL 0.0962:5.26 120.0 zpk([5.26],[0.0962],1,"n")
      CH2 LL 0.0948:5.17 120.5 zpk([5.17],[0.0948],1,"n")
      CH3 UR 0.0941:5.12 120.5 zpk([5.12],[0.0941],1,"n")
      CH4 LR 0.0958:5.23 120.25 zpk([5.23],[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/Results/
2025-10-20_UKSatAmp_S1000277_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:24, Tuesday 28 October 2025 (87822)

Here's the characterization data and fit results for S1100169, assigned to MC2 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_S1100169_MC2_M2_ULLLURLR_20251020.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 M2 S1100169 CH1 UL 0.0976:5.34 120.25 zpk([5.34],[0.0976],1,"n")
      CH2 LL 0.0964:5.26 120.25 zpk([5.26],[0.0964],1,"n")
      CH3 UR 0.0955:5.21 120.25 zpk([5.21],[0.0955],1,"n")
      CH4 LR 0.0973:5.31 120.2 zpk([5.31],[0.0973],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/
2025-10-20_UKSatAmp_S1100169_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:25, Tuesday 28 October 2025 (87823)

Here's the characterization data and fit results for S1100174, assigned to MC2 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_S1100174_MC2_M3_ULLLURLR_20251020.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 M3 S1100174 CH1 UL 0.0993:5.43 120 zpk([5.43],[0.0993],1,"n")
      CH2 LL 0.0969:5.3 120 zpk([5.3],[0.0969],1,"n")
      CH3 UR 0.0951:5.2 120 zpk([5.2],[0.0951],1,"n")
      CH4 LR 0.0952:5.2 120 zpk([5.2],[0.0952],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/
2025-10-20_UKSatAmp_S1100174_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:25, Tuesday 28 October 2025 (87824)

Here's the characterization data and fit results for S1100146, assigned to SR3 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_S1100146_SR3_M2_ULLLURLR_20251020.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 
SR3 M2 S1100146 CH1 UL 0.0968:5.29 120.0 zpk([5.29],[0.0968],1,"n")
      CH2 LL 0.0989:5.4 120.0 zpk([5.4],[0.0989],1,"n")
      CH3 UR 0.0948:5.18 120.0 zpk([5.18],[0.0948],1,"n")
      CH4 LR 0.0966:5.27 120.25 zpk([5.27],[0.0966],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/
2025-10-20_UKSatAmp_S1100146_D0901284-v5_fitresults.txt

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), Jeff 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 - 21:26, Tuesday 28 October 2025 (87825)

Here's the characterization data and fit results for S1100134, assigned to SR3 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_S1100134_SR3_M3_ULLLURLR_20251020.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 
SR3 M3 S1100134 CH1 UL 0.0975:5.32 120.0 zpk([5.32],[0.0975],1,"n")
      CH2 LL 0.0958:5.23 120.0 zpk([5.23],[0.0958],1,"n")
      CH3 UR 0.0958:5.22 120.375 zpk([5.22],[0.0958],1,"n")
      CH4 LR 0.0985:5.38 120.25 zpk([5.38],[0.0985],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/
2025-10-20_UKSatAmp_S1100134_D0901284-v5_fitresults.txt

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), Jeff 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