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)

(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)

(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)

(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)

(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