H1 had a lockloss about 90min ago for no obvious reasons.  All was quiet as well.  Attempted to relock but DRMI did not look great; also went for Check MICH Fringes + PRMI---could not even get PRMI locks after letting it try for 20min.  Ultimately went for an alignment and where we are.  Flashes look mostly decent and POP18/90 are flashing close to 200, but just have not had any locks (only a few short ~1sec locks thus far).  Microseism is just under the 95th percentile.  Currently at 20min of DRMI locking.

Famis task 26658 H1 ISI CPS Sensor Noise Spectra Check - Weekly


Compairing to https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=87025
HAM7_CPSINF_V2 & HAM7_CPSINF_V3 look a bit elevated around 36hz. 
ETMX_ST2_CPSINF_V3 has a 16hz increase in it, actually so does ST1.



 

TITLE: 09/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.40 μm/s 
QUICK SUMMARY:

H1's been locked 3+hrs (locking post-Maintenance went smoothly according to TJ!).  

There is a CE/ET beam tube meeting going on this week (will be locking doors at "close of buisiness tonight).

Also got word from Erik that we can test a new ndscope with "ndscope -test".

Dave, TJ, Camilla

While Dave was troubleshooting a HWS file issue (started in 84865 but just noticed via HWS Live issues), TJ and I took new HWS references for ITMX and ITMY while we were re-locking at 25W in, MOVE_SPOTS. This is not the best place to take new references, so we plan to take new references again next Tuesday while in DOWN with a cool IFO. 

Yesterday Matt and I realized that the ITMX HWS frequency had been at 57Hz rather than the nominal 1Hz since the power outage which was making the SPHERICAL_POWER signal very noisy, reverted to 1Hz.

WP12822, Sheila, Camilla 

Followed what we did in 82881, but did not need to adjust alignment through the EOM. Last done only ~6 weeks ago in 86323. 

SHG Power dropped when we opened the table and turned on the fan and again when we closed up so we adjusted the SHG TEC temperature twice, it ended up where it started, plot attached. 

Starting with:

• 85mW into AOM.
• With 5V on ISS AOM controlmon: 30mW in 0th order and 8.6mW in first order beam.
• With 0V on ISS AOM controlmon: 43mW after AOM

Then with 0V on ISS AOM controlmon, increased throughput, this was a yaw move of the AOM, moving the AOM in +X. Then put 5V on controlmon and started to maximize the 1st order beam. We decided to not completely maximize 1st order as this reduces overall throughput and our current aim is to increase total green throughout, not ISS AOM range.

Ended with:

• With 5V on ISS AOM controlmon: 42mW in 0th order and 9mW in first order beam.

Sheila then adjusted the alignment into the fiber and maximized H1:SQZ-OPO_REFL_DC_POWER (needed to reduce power going into fiber with pico-waveplate to avoid saturating PD).

This allowed us to have an OPO setpoint of 80uW with 25mW going into the fiber, with 5 on the controlmon and a spare~20mW that we could give to the fiber.  Note that after ~2hours, the controlmon had decreased from 5 to 4. So the power to the AOM may need to be increased next time we loose lock.

I checked the NLG and OPO temp in the process:

TITLE: 09/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Fairly light maintenance day, with relocking being automated other than me testing out some tramps at find ir. as of right now we have been locked for 1 hour.
LOG:

• 1417 Lock loss
• 1209 Started initial alignment
• 2028 Observing                                                                                                                                                                                                                                                                                                                                                                                      

• Start Time	System	Name	Location	Lazer_Haz	Task	Time End
  16:48	VAC	Pump	LVEA	N	AIP pumping on HAM6	18:12
  14:52	VAC	Jordan	LVEA	n	Turning off pump carts	14:53
  14:53	SYS	Betsy, Randy	Opt Lab	n	Parts and such	14:57
  14:57	SYS	Randy, Tyler	LVEA	n	Craning in N bay	15:48
  15:01	FAC	Kim, Nelly	LVEA	n	Tech clean	16:02
  15:19	FAC	Chris, Eric	EX	n	Fan noise investigation	15:52
  15:37	CDS	Tony, Erik	EX, EY	n	Checking laptops and HWWD	16:52
  15:37	PEM	Robert	LVEA	n	Setting up measurements	19:08
  15:37	SUS/CDS	Fil	LVEA	n	SR2, PR2 sat amp swap	16:18
  15:41	SEI	Jim, Dave, Fil	LVEA, remote	n	HAM6 model restarts and epoxying under HAM6	16:30
  15:57	ISC	Camilla	LVEA, Opt Lab	n	Putting things away and property	16:18
  16:04	FAC	Nelly	EY	n	Tech clean	16:50
  16:06	FAC	Kim	EX	n	Tech clean	17:12
  16:20	CDS	Marc	LVEA	n	Looking for Fil	16:31
  16:31	SEI	Jim	CR	n	Poking at HAM2/3/4	17:31
  16:33	FAC	Eric	CS	n	Fire pump tests	16:34
  16:45	PSL	Rahul, Jenne	Opt Lab	LOCAL	ISS array work	17:30
  16:51	PEM	Robert	LVEA	n	Measurement setup	18:39
  16:53	FAC	Tyler	Mids	n	3IFO checks, closing doors behind tour	19:10
  16:54	CDS	Fil, Marc	MY, EY	n	Grabbing parts for R7 chassis	19:10
  17:13	FAC	Kim, Nelly	FCES	n	Tech clean	17:57
  17:37	VAC	Gerardo, Jordan	LVEA	n	Disconnecting pump carts by HAM5/6	18:12
  17:44	TCS	Camilla, Elenna	EY	YES	Taking power measurement	18:22
  18:04	PSL	Jason, Christina	Opt Lab	n	Property labeling lasers	18:11
  18:05	VAC	Norco	CS (CP1)	n	LN2 fill	19:52
  18:05	VAC	Guests	LVEA	n	Beam tube workshop tour	18:37
  18:17	VAC	Norco	MX (CP5)	n	LN2 fill	19:53
  18:22	VAC	Mike, Matt	LVEA	n	Join tour	18:37
  18:24	SUS	Oli	CR	n	PRM, SRM measurements	19:24
  18:37	VAC	Guests	X arm	n	Drive down to X1 BT and on overpass	19:09
  18:47	SQZ	Camilla, Sheila	LVEA	YES	Working on back of SQZT0	19:52
  18:47	SAF	Sheila	LVEA	YES	Transitioning to LASER HAZARD	19:06
  19:10	-	Ryan C	LVEA	YES	Sweep	19:20
  19:31	PSL	Rahul, Jenne	Opt Lab	LOCAL	ISS array	20:29

WP#12819 Elenna, Camilla 

Elenna and I went to the EY VEA, opened the ALS table and measured the power out of the HWS collimator, there was 9uW out of the collimator and 31uW out of the fiber, before the collimator. We didn't take the wincam down there but I've attached two photos of the beam, one straight after the colimator, and one before HWS-S2 D1400241. It looks very top-hat like. 

Edgard ran the OSEM calibration calculations for the measurements Jeff and I took last week for PRM(measurements, results) and SRM(measurements, results). Today, I updated the OSEMINF gains with the newly calibrated ones for their respective suspension and OSEM, and I also installed the compensation gains into the DAMP filters for PRM and SRM to counter the apparent shift in alignment due to the updated calibration OSEM gains.

To update the OSEMINF gains I put the stage, OSEM, and gain values into a txt file and used my script /ligo/home/oli.patane/Documents/WIP/estimator/OSEMcalib_updateOSEMINFgains.py to go through and update all the OSEM gains. Here are the outputs for that - PRM, SRM.

To add the DAMP compensation gains in the DAMP filter bank, I put the dof and gain values into a txt file (only for M1) and used my script /ligo/home/oli.patane/Documents/WIP/estimator/OSEMcalib_DAMPcomp.py to remove the old filters that were in FM7 (they were not being used and are sdf'd if we end up needing them again) and replaced them with the compensation gains. Here are the outputs for that - PRM, SRM, and here are the filter changes before I loaded them in - PRM, SRM.

I then went through and turned FM7 on for DAMP M1 for PRM and SRM, and then went through the safe.snap and observe.snap and accepted the gain and filter status changes (PRM, SRM).

These updates means that there will be an apparent change in alignment on PRM and SRM, but this change in alignment is not real.

There are two tramps in the LONG_SEARCH_IR state in ALS_DIFF for when we are trying to find IR, I've changed these to 1 second when stepping around a known value and to 2 seconds when transitioning to a new known value. Previously these were 4 and 10 respectively. 

Years ago I tested this and found that I couldn't rush this pzt, but I didn't document why or to what extend. I've been frustrated with how long it has been taking, so I wanted to try it out again and see if I could speed it up and/or find out why I couldn't before. I couldn't really create any issues, but perhaps they only rear their head up when we aren't the best aligned. I ended up bringing them down to the values listed above with repeated success so I'll leave it there and continue locking.

Continuing with our satamp swaps for the lower stages, Fil swapped out the M2 and M3 satamps for PR2 and SR2 today (87225). To properly compensate for this change, I used the TIA measurements Jeff took for each satamp's channels and used my script /ligo/svncommon/SusSVN/sus/trunk/Common/PythonTools/satampswap_bestpossible_filterupdate_ECR_E2400330.py to update the compensation filters (satampfilterupdate_output). I then checked that they looked good(PR2, SR2) and loaded them in.

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.

F. Clara, J. Kissel, O. Patane

Tue Sep 30 10:09:27 2025 INFO: Fill completed in 9min 24secs

M. Todd

Summary

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.

List of Figures

1. DOF 1 P Measurement of IMC to ISS 2ND LOOP RIN
2. DOF 1 Y Measurement of IMC to ISS 2ND LOOP RIN 
3. DOF 2 P Measurement of IMC to ISS 2ND LOOP RIN
4. DOF 2 Y Measurement of IMC to ISS 2ND LOOP RIN
5. DOF 3 P Measurement of IMC to ISS 2ND LOOP RIN
6. DOF 3 Y Measurement of IMC to ISS 2ND LOOP RIN

[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