Looks like when one of the triggers for SRCL turned on, it tripped M3 a handful of seconds later. Another odd thing I'm seeing after I've untripped and tried PRMI is that the triggering seems to be turning on and off rapidly.
Nothing obvious.
Back to Observing at 0005 UTC. After I cycled through MICH Bright, PRMI, then DRMI caught and it went back up. Not sure why SRM tripped.
TITLE: 09/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY: Quiet shift, we stayed locked the entire time.
LOG: N/A
The LSC front end has an FPU (floating point unit) error. The recent range drop post glitch looks to line up with a ~50 SNR low frequency glitch as seen on the Omicron plot on nuc27, and 2.5 hours ago there's some extra noise in the low frequency SQZ blrms. The recent glitch look to be from =< 450Hz, as it's seen only in BAND_1-5.
TITLE: 09/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 9mph Gusts, 4mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.39 μm/s
QUICK SUMMARY: Locked for almost 7 hours, calm environment.
Sun Sep 28 10:10:39 2025 INFO: Fill completed in 10min 35secs
TITLE: 09/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 9mph Gusts, 7mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.35 μm/s
QUICK SUMMARY:
Got called at 4:50 due to a mysterious SRM trip at 4:47 AM. IFO was in SRC ALIGN for initial alignment and SRM was railing during PREP_FOR_SRY. ST2 and ST3 sus tripped, which makes me think that initial alignment may have caused it? Microseism is on the rise but nothing jumps at me otherwise (attached).
Either way, I untripped it and waited until IFO got to DRMI which it just did. Flashes look good. Will continue light monitoring but I think guardia can take it from here.
Reset myself as the OWL.
Taking a look at some of the signals, SRM tripped at 11:47:36, about 30 seconds after it was aligned. An oscillation started ~5 seconds before the WD trip. ALIGN_IFO was starting SRC, the motion was mostly seen by the lower stage osems, M1 did not trip (barely, LF and RT saw an RMS of 140 where the trip threshold is 150). LF and RT seemed to see the largest motion, DAMP_Y_INMON was much larger than P which also tracks with that.
TITLE: 09/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Quiet shift, locked for 5 hours. Range is much more stable than the last lock and up a few Mpc.
LOG:
TITLE: 09/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 4mph Gusts, 1mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.33 μm/s
QUICK SUMMARY: Just got back to observing after a 31 hour lock.
Relocking took a bit longer due to an earthquake off of the coast of oregon rolling through. The only thing of note was that I changed the threshold in ALIGN_IFO for the MICH Bright convergence checker from 1.5 to 2. This average convergence checker I've seen take longer then it should so I wanted to try to speed it up a bit.
TITLE: 09/27 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: TJ
SHIFT SUMMARY: The SQZer struggled a little before and during the calibration measurement, 1 lockloss that we are still recovering from (move spots as of 23:30).
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 16:48 | VAC | Pump | LVEA | N | AIP pumping on HAM6 | 02:42 |
| 22:16 | VAC | TJ | LVEA | N | Plug in ION pump | 22:21 |
FAMIS26688
The EX fan2 is starting to get noisy. EY fan 1 is also starting to see some extra noise during the night (see the green trace on attachment 2).
Corner station and other outbuildings look good.
FAMIS26666
A few known blips from the power outage and the corrupted frames (alog86985), but it also looks like the temperature changed in both BRSs this week. I don't see any alogs on this, but it does seem to be putting it in the correct direction, leading me to think this was done by someone.
Other than that, the drift looks good.
Yesterday Gerardo instructed my to plug in the ion pump that's on top of HAM5 if we have a lock loss. The plug and recepticle are located on the NW corner of HAM5. Turning on the ion pump will help transition off of the carts that are pumping there sooner than waiting until a weekday.
21:34 UTC lockloss
As Ryan correctly identified, the issue to why the SQZ dropped was there was no enough green power to keep the OPO ISS locked. So he had to reduced the setpoint in sqzparams from 80uW to 75uW. It wouldn't surprise me if this happens again as we are still close to the botton of the ISS's range.
Tomorrow AM we'll check if we can get any more power with the SHG waveplate, otherwise we may need to realign through the AOM and into the fiber again as we last did in 86323 or move crystal spots.
We have been locked for around 29 hours at the start of the measurement.
Broadband:
Start: 2025-09-27 19:23:09 UTC
Stop: 2025-09-27 12:28:20 UTC
Files: /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20250927T192309Z.xml
Simulines: The SQZer lost lock in the middle of this at 19:33, and wasn't able to relock until the measurement completed.
Start: 2025-09-27 19:28:45 UTC // 1443036543.471832 GPS
Stop: 2025-09-27 19:52 UTC // 1443037941.223046 GPS
Files:
2025-09-27 19:52:03,067 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20250927T192846Z.hdf5
2025-09-27 19:52:03,076 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20250927T192846Z.hdf5
2025-09-27 19:52:03,081 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20250927T192846Z.hdf5
2025-09-27 19:52:03,085 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20250927T192846Z.hdf5
2025-09-27 19:52:03,089 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20250927T192846Z.hdf5
I took Jeff's measruements for calibrating the PRM OSEMs [LHO: 87102] to calibrate the M1, M2 and M3 stages. [See similar calcs for SRM here: LHO: 87166]. I only analyzed the data for the ALIGNED position of the suspension.
The TL;DR is that the M1 calibrations are in line with expectations from PR3/SR3/SRM.
The M2 calibrations are all over the place, with the Left side OSEMs seeing the most chenges (factors of 3.6 for LL and 2.2 for LR)
The M3 calibrations are really off for the Left side OSEMs (factors of 10 (!) for LL and 4 for LR).
My expectation is that the yaw alignment is really pushing these OSEMs to a point where the nonlinear response has kicked in enough that the ir response is all wonky. I think we need to analyze this information more before drawing any snap conclusions. I will do this on Monday to be ahead of Tuesday maintenance
Here is the full output of the calibration script [see attached figures for the before and after comparison]:
______________________________________________________________________
OSEM calibration of H1:SUS-PRM
Frequency range for calibration: 6 to 15 Hz
Stages to be calibrated: ['M1' 'M2' 'M3']
Measurement date: 2025-09-23_1810 (UTC).
%%%%%%%%%%%%
Stage: M1
%%%%%%%%%%%%
The suggested (calibrated) M1 OSEMINF gains are
(new T1) = 1.365 * (old T1) = 1.646
(new T2) = 1.265 * (old T2) = 1.370
(new T3) = 1.544 * (old T3) = 1.727
(new LF) = 1.702 * (old LF) = 1.840
(new RT) = 1.499 * (old RT) = 1.504
(new SD) = 1.627 * (old SD) = 1.808
To compensate for the OSEM gain changes, we estimate that the H1:SUS-PRM_M1_DAMP loops must be changed by factors of:
L gain = 0.627 * (old L gain)
T gain = 0.614 * (old T gain)
V gain = 0.726 * (old V gain)
R gain = 0.726 * (old R gain)
P gain = 0.719 * (old P gain)
Y gain = 0.627 * (old Y gain)
The calibration will change the apparent alignment of the suspension as seen by the M1 OSEMs
NOTE: The actual alignment of the suspension will NOT change as a result of the calibration process
The changes are computed as (osem2eul) * gain * pinv(osem2eul).
Using the alignments from 2025-09-23_1810 (UTC) as a reference, the new M1 apparent alignments are:
DOF Previous value New value Apparent change
---------------------------------------------------------------------------
L -78.6 um -125.4 um -46.8 um
T 83.9 um 136.5 um +52.6 um
V 50.6 um 67.5 um +16.8 um
R 64.4 urad 115.3 urad +51.0 urad
P -1229.3 urad -1507.6 urad -278.4 urad
Y -45.2 urad 27.0 urad +72.2 urad
%%%%%%%%%%%%
Stage: M2
%%%%%%%%%%%%
The suggested (calibrated) M2 OSEMINF gains are
(new UL) = 1.162 * (old UL) = 1.428
(new LL) = 3.622 * (old LL) = 4.249
(new UR) = 1.141 * (old UR) = 1.344
(new LR) = 2.281 * (old LR) = 2.589
The calibration will change the apparent alignment of the suspension as seen by the M2 OSEMs
NOTE: The actual alignment of the suspension will NOT change as a result of the calibration process
The changes are computed as (osem2eul) * gain * pinv(osem2eul).
Using the alignments from 2025-09-23_1810 (UTC) as a reference, the new M2 apparent alignments are:
DOF Previous value New value Apparent change
---------------------------------------------------------------------------
L 13.3 um 58.9 um +45.6 um
P -981.3 urad -2050.3 urad -1069.0 urad
Y 645.5 urad 905.7 urad +260.1 urad
%%%%%%%%%%%%
Stage: M3
%%%%%%%%%%%%
The suggested (calibrated) M3 OSEMINF gains are
(new UL) = 1.368 * (old UL) = 1.645
(new LL) = 10.906 * (old LL) = 13.240
(new UR) = 1.522 * (old UR) = 1.709
(new LR) = 4.051 * (old LR) = 4.756
The calibration will change the apparent alignment of the suspension as seen by the M3 OSEMs
NOTE: The actual alignment of the suspension will NOT change as a result of the calibration process
The changes are computed as (osem2eul) * gain * pinv(osem2eul).
Using the alignments from 2025-09-23_1810 (UTC) as a reference, the new M3 apparent alignments are:
DOF Previous value New value Apparent change
---------------------------------------------------------------------------
L 68.5 um 551.8 um +483.3 um
P -1519.6 urad -11711.4 urad -10191.7 urad
Y -344.6 urad -6603.7 urad -6259.1 urad
We have calculated a GS13 to OSEM calibration of H1 PRM ['M1' 'M2' 'M3'] using HAM2 ST1 drives from 2025-09-23_1810 (UTC).
We fit the response PRM_OSEMINF/HAM2_SUSPOINT to unity between 6 and 15 Hz to get a calibration such that 1 [OSEM m] = [GS13 m]
This message was generated automatically by OSEM_calibration_master.py on 2025-09-27 02:12:10.458163+00:00 UTC
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
EXTRA INFORMATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%
Stage: M1
%%%%%%%%%%%%
The H1:SUS-PRM_M1_OSEMINF gains at the time of measurement were:
(old) T1: 1.206
(old) T2: 1.083
(old) T3: 1.119
(old) LF: 1.081
(old) RT: 1.003
(old) SD: 1.111
The matrix to convert from the old PRM M1 Euler dofs to the (calibrated) new Euler dofs is:
+1.601 -0.0 +0.0 +0.0 -0.0 -0.008
+0.0 +1.627 -0.0 +0.0 +0.0 +0.0
+0.0 -0.0 +1.385 -0.001 +0.002 -0.0
-0.0 +0.0 -0.326 +1.385 -0.035 +0.0
+0.0 -0.0 +4.675 -0.28 +1.404 -0.0
-1.265 +0.0 -0.0 -0.0 +0.0 +1.601
The matrix is used as (M) * (old EUL dof) = (new EUL dof)
The dof ordering is ('L', 'T', 'V', 'R', 'P', 'Y')
%%%%%%%%%%%%
Stage: M2
%%%%%%%%%%%%
The H1:SUS-PRM_M2_OSEMINF gains at the time of measurement were:
(old) UL: 1.229
(old) LL: 1.173
(old) UR: 1.178
(old) LR: 1.135
To compensate for the M2 OSEM gain changes, any controllers using the M2 OSEMs as inputs must be compensated with gains of:
L gain = 0.611 * (old L gain)
P gain = 0.610 * (old P gain)
Y gain = 0.506 * (old Y gain)
The matrix to convert from the old PRM M2 Euler dofs to the (calibrated) new Euler dofs is:
+2.052 -0.043 -0.016
-18.856 +2.052 +0.33
-7.135 +0.33 +2.052
The matrix is used as (M) * (old EUL dof) = (new EUL dof)
The dof ordering is ('L', 'P', 'Y')
%%%%%%%%%%%%
Stage: M3
%%%%%%%%%%%%
The H1:SUS-PRM_M3_OSEMINF gains at the time of measurement were:
(old) UL: 1.202
(old) LL: 1.214
(old) UR: 1.123
(old) LR: 1.174
To compensate for the M3 OSEM gain changes, any controllers using the M3 OSEMs as inputs must be compensated with gains of:
L gain = 0.424 * (old L gain)
P gain = 0.431 * (old P gain)
Y gain = 0.272 * (old Y gain)
The matrix to convert from the old PRM M3 Euler dofs to the (calibrated) new Euler dofs is:
+4.462 -0.144 -0.08
-63.208 +4.462 +1.752
-35.107 +1.752 +4.462
The matrix is used as (M) * (old EUL dof) = (new EUL dof)
The dof ordering is ('L', 'P', 'Y')
