h1sush7 and h1seih7 are back in operation.

During the rack work we lost h1sush7's second IO Chassis Adnaco, it should show 3 ADCs but lspci was giving nonsensical mappings. We power cycled both computer and IO Chassis for h1sush7 and it came back with no problems. 

h1seih7 was un-fenced from Dolphin, no model restarts were needed.

HAM7 SWWD was reset to take it out of bypass.

WARNING:  We need to check this before we use it again. These projections were done for the sensors, not the actuators. 

The EUL basis -> ISI drives actuator matrix needs to be calculated and added to the suspoint projections script and data in the repo. Edgard says this should be the transpose of the sensor matrix, not the inverse. Documentation is in progress.
(EUL2CART and CART2EUL are both for the sensor projection, and are inverses of each other)

Ohp. I made a mistake here.

The drive matrix calculation bit is true about applied drives. However, because the ISI drive requests here are made at the error point of the ISO loops, the inverse is actually correct. Nevermind what I said before.

Apologies for the confusion.

We also took SQZ_OPO_LR GRD to LOCKED_CLF no ISS to check that the pump AOM wasn't injecting any noise.

Ended up leaving ZM4 PSAMs at 6.2V on the strain gauge, old nominal was 6.0V sdf attached. This is only a 9V change on the 0-200V PSAMs, from 78V to 87V. Which doesn't seem big enough to cause such an effect.

• Plot of repeatably changing ZM5 PSAMS along with ZM5 PIT alignment to make noise appear and go
• Plot of repeatably changing ZM4 PSAMS (no ZM4 PIT alignment needed) to make noise appear and go.
  • Interestingly 6.0V would be noisy, 6.5V would be noisy, but 6.2V was not! This is confusing.
• Plot of changing ZM4 PIT and YAW alignments slowly ~50urad each way, no difference in noise.
  • I also checked ZM5 more quickly and noticed no obvious change
  • For ZM4 I tried taking the PIT alignment back to the same osems the good 6.2V PSAMS setting has the osems at, the noise did not change.

Sheila posted backscatter measurements in 86836, and opened an FRS ticket for this issue: FRS # 35457.

B:BS1 is a 99/1 BS (see D2000021 spreadsheet). The PD that the beam transmitting B:BS1 goes to H1:IOO-OFI_PD_A_DC_POWER, this doesn't see any increased noise at the noisy time, although it's only a 16Hz channel: time series and dtt attached. 

I could increase the power on B:PD1 by ~25% by moving ZM4 and ZM5 in yaw before we lost RF3 and SQZ went down, showing we are nominally clipping this PD, plot attached. We can repeat Sheila's backscatter measurements with a different amount of light on this PD to see if it's the culprit.

Two issues I'm seeing in these plots  1) The ITMX HWS SLED is degrading faster than previous SLEDs and  2) There is some weirdness going on with the ITMX CO2 flow meter a week and a half ago.

ITMX HWS SLED

The rate of degradation of these sleds is often on the order of roughly 2mW/yr. This is why we can generally get about a year's worth out of each SLED. Comparing the last ITMX SLED and the one that we just installed in May (alog84417), the old SLED decayed at a rate of 2.43mW/yr and the new one is 4.2mW/yr. This is just from making some lines in ndscope, so it's pretty rough, but we can definitey say that it is degrading about 2x as fast as the last SLED (attachment 1). The ITMY SLEDs are a bit more consistent at: previous = 2.7mW/yr and new = 2.2mW/yr.

We saw that on the ITMY SLED this last time around that we were still able to see spherical power changes from lock to lock even with the SLED power reporting 0.5mW, and ring heater changes were tough to see (alog84408). Let's consider 0.5mW to be our limit we can take these, but really it should be before we can't see anything, at our current rate this SLED would finish the run at ~0.3mW. Looks like we will need to swap this one before the end of the run.

ITMX CO2 Flow

In Ryan's alog I noticed that the usual change in flow, as reported by the paddle wheel flow meter on the floor, became much more stable on Sunday Aug. 24th. Looking back over two years (attachment 2), it actually looks like the flow has been unusually unstable since returning from the spring vent, and whatever happened on the 24th brought us back to normal. Being a Sunday, there wasn't much going on (alog86540), we were in the middle of a 40+ hour long lock. Zooming into the event doesn't show the laser doing anything during that time, as if it didn't actually see a change in flow. Not sure what's going on here.

A few weeks later and the TCSX flow is still more stable. No idea what happened on that Sunday, but the reported flow looks to be back to what it was pre spring vent.

Here's the characterization data and fit results for S2001291, assigned to FC1 M1's T1T2T3LF OSEMs (Fil refers to this just FC1 T1T2T3LF above).
This sat amp is a US 4CH sat amp, D1900089 / D1900217, not a UK 4CH sat amp, but this type and all sat amps are now covered in -v2 of ECR E2400330.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 2 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_S2001291_FC1_M1_T1T2T3LF_20250804.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
FC1      M1       S2001291         CH1                T1           0.0944:5.16     121	         zpk([5.16],[0.0944],1,"n")
FC1                                CH2                T2           0.0931:5.09     121           zpk([5.09],[0.0931],1,"n")
FC1                                CH3                T3           0.0943:5.16     121           zpk([5.16],[0.0943],1,"n")
FC1                                CH4                LF           0.0930:5.08     121           zpk([5.08],[0.0930],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 the default 121 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S2001287, assigned to FC1 M1's RTSDxxx OSEMs (Fil refers to this just FC1 RTSD above).
This sat amp is a US 4CH sat amp, D1900089 / D1900217, not a UK 4CH sat amp, but this type and all sat amps are now covered in -v2 of ECR E2400330.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 2 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_S2001287_FC1_M1_RTSDxxxx_20250804.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
FC1      M1       S2001287         CH1                RT           0.0922:5.05     121           zpk([5.05],[0.0922],1,"n")
FC1                                CH2                SD           0.0919:5.03     121           zpk([5.03],[0.0919],1,"n")
FC1                                CH3                xx           0.0937:5.13     121           zpk([5.13],[0.0937],1,"n")
FC1                                CH4                xx           0.0927:5.08     121           zpk([5.08],[0.0927],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 the default 121 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S2001292, assigned to FC2 M1's T1T2T3LF OSEMs (Fil refers to this just FC2 T1T2T3LF above).
                  Note that Fil flip-flopped the "Old" vs. "New" serial numbers in the main aLOG above.

This sat amp is a US 4CH sat amp, D1900089 / D1900217, not a UK 4CH sat amp, but this type and all sat amps are now covered in -v2 of ECR E2400330.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 2 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_S2001292_FC2_M1_T1T2T3LF_20250804.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
FC2      M1       S2001292         CH1                T1           0.0935:5.11     121           zpk([5.11],[0.0935],1,"n")
FC2                                CH2                T2           0.0910:4.98     121           zpk([4.98],[0.0910],1,"n")
FC2                                CH3                T3           0.0923:5.05     121           zpk([5.05],[0.0923],1,"n")
FC2                                CH4                LF           0.0923:5.05     121           zpk([5.05],[0.0923],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 the default 121 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S2001288, assigned to FC2 M1's RTTSDxxxx OSEMs (Fil refers to this just FC2 RTSD above).
               Note that Fil flip-flopped the "Old" vs. "New" serial numbers in the main aLOG above.

This sat amp is a US 4CH sat amp, D1900089 / D1900217, not a UK 4CH sat amp, but this type and all sat amps are now covered in -v2 of ECR E2400330.

The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 2 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_S2001292_FC2_M1_T1T2T3LF_20250804.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
FC2      M1       S2001288         CH1                RT           0.0936:5.12     121           zpk([5.12],[0.0936],1,"n")
FC2                                CH2                SD           0.0921:5.04     121           zpk([5.04],[0.0921],1,"n")
FC2                                CH3                xx           0.0923:5.05     121           zpk([5.05],[0.0923],1,"n")
FC2                                CH4                xx           0.0923:5.05     121           zpk([5.05],[0.0923],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 the default 121 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S1000278, assigned to IM1 M1's ULLLURLR OSEMs (Fil refers to this as IM1 ULLLURLR above).

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_S1000278_IM1_M1_ULLLURLR_20250721.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
IM1      M1       S1000278         CH1                UL           0.0932:5.11     120           zpk([5.11],[0.0932],1,"n")
IM1                                CH2                LL           0.0965:5.29     120           zpk([5.29],[0.0965],1,"n")
IM1                                CH3                UR           0.0968:5.30     120           zpk([5.30],[0.0968],1,"n")
IM1                                CH4                LR           0.0950:5.19     120           zpk([5.19],[0.0950],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 the default 120 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S1100149, assigned to IM2 M1's ULLLURLR OSEMs (Fil refers to this as IM2 ULLLURLR above).

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_S1100149_IM2_M1_ULLLURLR_20250721.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
IM2      M1       S1100149         CH1                UL           0.0966:5.29     120           zpk([5.29],[0.0966],1,"n")
IM2                                CH2                LL           0.0955:5.24     120           zpk([5.24],[0.0955],1,"n")
IM2                                CH3                UR           0.0969:5.31     120           zpk([5.31],[0.0969],1,"n")
IM2                                CH4                LR           0.0967:5.29     120           zpk([5.29],[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/

Per usual, R_TIA_kOhm is the default 120 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S1000281, assigned to IM3 M1's ULLLURLR OSEMs (Fil refers to this as IM3 ULLLURLR above).

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_S1000281_IM3_M1_ULLLURLR_20250731.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
IM3      M1       S1000281         CH1                UL           0.0976:5.34     120           zpk([5.34],[0.0976],1,"n")
IM3                                CH2                LL           0.0955:5.23     120           zpk([5.23],[0.0955],1,"n")
IM3                                CH3                UR           0.0955:5.23     120           zpk([5.23],[0.0955],1,"n")
IM3                                CH4                LR           0.0955:5.23     120           zpk([5.23],[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/

Per usual, R_TIA_kOhm is the default 120 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S1100083, assigned to IM4 M1's ULLLURLR OSEMs (Fil refers to this as IM4 ULLLURLR above).

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_S1100083_IM4_M1_ULLLURLR_20250731.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
IM4      M1       S1100083         CH1                UL           0.0955:5.22     120           zpk([5.22],[0.0955],1,"n")
IM4                                CH2                LL           0.0979:5.36     120           zpk([5.36],[0.0979],1,"n")
IM4                                CH3                UR           0.0966:5.29     120           zpk([5.29],[0.0966],1,"n")
IM4                                CH4                LR           0.0978:5.35     120           zpk([5.35],[0.0978],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 the default 120 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S1100150, assigned to OMC M1's T1T2T3LF OSEMs (Fil refers to this as just OMC T1T2T3LF above).

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_S1100150_OMC_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
OMC      M1       S1100150         CH1                T1           0.0965:5.28     120           zpk([5.28],[0.0965],1,"n")
OMC                                CH2                T2           0.0947:5.17     120           zpk([5.17],[0.0947],1,"n")
OMC                                CH3                T3           0.0961:5.25     120           zpk([5.25],[0.0961],1,"n")
OMC                                CH4                LF           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/Results/

Per usual, R_TIA_kOhm is the default 120 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.

Here's the characterization data and fit results for S1100112, assigned to OMC M1's RTSDxxxx OSEMs (Fil refers to this as just OMC RTSD above).

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_S1100112_OMC_M1_RTSDxxxx_20250721.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
OMC      M1       S1100112         CH1                RT           0.0954:5.22     120           zpk([5.22],[0.0954],1,"n")
OMC                                CH2                SD           0.0952:5.21     120           zpk([5.21],[0.0952],1,"n")
xx                                 CH3                xx           0.0945:5.17     120           zpk([5.17],[0.0945],1,"n")
xx                                 CH4                xx           0.0980:5.36     120           zpk([5.36],[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/Results/

Per usual, R_TIA_kOhm is the default 120 kOhm is not used in the compensation filter -- the magnitude of the measurements didn't need me to adjust them; I was able to get a good phase and magnitude fit by only adjusting the zero frequency.