I adjusted a PEM cable to be more out of the walking path by the TCSY table and I also unplugged, rolled up, and moved an unused extension cable out of the way in the same area. I also put folded away a ladder that was out next to SUS R4.
This morning while in the CER for other reasons, I heard a coil driver on HAM4 ISI making a ticking/chirping noise. Fil suggested this was probably a fan, so we've pulled the chassis to check it out. We've put in a spare and will run that until next maintenance probably.
Chassis pulled is S1100320, the spare we put in is S1103567. Frs is https://services1.ligo-la.caltech.edu/FRS/show_bug.cgi?id=35547
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
(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.
(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.
(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.
(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.
Tue Sep 30 10:09:27 2025 INFO: Fill completed in 9min 24secs
M. Todd
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.
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.
[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.
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.
[Tony, Erik]
We verified that the ETMX hardware watchdog started to count down when the connection from the satellite amps for ETMX was removed.
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
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 |
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.
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.
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.
Looks like the SQZer unlocked at 1216 UTC this morning, relocking again and gettting back into Observing at 1220 UTC.
Reason for SQZ unlock was PMC PZT getting to the end of it's range at 100V.
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.
Workstations were updated and rebooted. This was an OS packages updated. Conda packages were not updated.
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:
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:
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.
We swapped the old chassis back in yesterday, after Fil replaced the fan last week.