aLIGO LHO Logbook

LHO VE - Tue CP1 Fill

david.barker@ligo.org — Tue, 24 Feb 2026 10:47:09 -0800

Author: david.barker@ligo.org

Report ID: 89243

Tue Feb 24 10:14:58 2026 INFO: Fill completed in 14min 54secs

Images attached to this report

LHO General - Comment to Ops Day Shift Start

ryan.short@ligo.org — Tue, 24 Feb 2026 08:42:37 -0800

Author: ryan.short@ligo.org

Report ID: 89242

The IMC_LOCK Guardian had been left trying to acquire all night with the light pipe closed, so I set it back to DOWN when I noticed that this morning.

H1 CDS - bypass fire pump alarms while churn testing is ongoing

david.barker@ligo.org — Tue, 24 Feb 2026 07:59:00 -0800

Author: david.barker@ligo.org

Report ID: 89241

Bypass will expire:
Tue Feb 24 11:57:58 AM PST 2026
For channel(s):
H0:FMC-CS_FIRE_PUMP_1
H0:FMC-CS_FIRE_PUMP_2

H1 IOO - Comment to JAC monday

betsy.weaver@ligo.org — Tue, 24 Feb 2026 07:54:03 -0800

Author: betsy.weaver@ligo.org

Report ID: 89240

FYI, there are about 24 beam dumps now installed on this table.

Images attached to this report

LHO General - Ops Day Shift Start

ryan.short@ligo.org — Tue, 24 Feb 2026 07:43:09 -0800

Author: ryan.short@ligo.org

Report ID: 89239

TITLE: 02/24 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 3mph Gusts, 1mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.29 μm/s
QUICK SUMMARY: In the homestretch on HAM1 alignment activities and JAC commissioning, which continues on this rainy morning.

H1 CDS - Workstations updated

erik.vonreis@ligo.org — Tue, 24 Feb 2026 06:35:12 -0800

Author: erik.vonreis@ligo.org

Report ID: 89238

Workstations were updated and rebooted. This was an OS packages update. Conda packages were not updated.

H1 TCS - CHETA Update

sophie.muusse@ligo.org — Mon, 23 Feb 2026 23:22:11 -0800

Author: sophie.muusse@ligo.org

Report ID: 89237

02/23 S. Muusse, C. Compton, G. Vajente, S.Goswami, B. Wu

The electronics chassis was brought into the lab today (thanks Phil and Dave) and we began testing the integration of the optomechanics with the CDS. An ethernet cable was run into the JOAT CHETA lab to connect to the server. A variable power supply was brought into the lab to power the chassis at the required 24V along with a linear power supply required for the rotation stage and translation stages.
The flipper I/O input and output had to be configured for Beckhoff communications using this guide.
The current status of our testing is as follows:
Working:

Flipper
PD
Power meter

Not working:

Rotation mount

Untested:

Translation stage

We have realised during this process that the flipper isn't powered by the SMA connectors and requires a seperate power source. This was not considered in the initial panel design and is not currently supplied by the chassis. There is a spare blank connector input/output slot which can be used.

We have begun making the medm display for the CHETA system based on the current CO2 medm which shares many optomechanical systems. CHETA isn't currently on the TCS screen so to run the medm display currently the following command must be run to access the work in progress.

medm -x -macro 'USERAPPS=/opt/rtcds/userapps/release/,SITE=LHO,site=lho,IFO=H1,ifo=h1,OPTIC=X,OPTICF=ITMX,name=AWCITMX,RT_MEDM=/opt/rtcds/lho/h1/medm' TCS_CHETA.adl

To open the medm in a configurable format:
medm TCS_CHETA.adl
Alternatively to edit the code files:
code medm TCS_CHETA.adl

Further alignment on the ITMY table was completed with almost all optics now mounted on the table.

Images attached to this report

H1 IOO - JAC monday

keita.kawabe@ligo.org — Mon, 23 Feb 2026 18:58:12 -0800

Author: keita.kawabe@ligo.org

Report ID: 89236

We installed JM1, balanced it and aligned it. A beam dump was placed behind it though we could not see the transmission with 1W input.

After this, JAC locked with RF without any problem though the input was wobbly when the purge was up.

We searched for unexpected ghost beams (also with 1W input) and didn't find any.

We uninstalled many (but not all) temporary dog clamps and irises.

We revisited the IMC alignment because it's been off in PIT since Thursday or Friday. We locked JAC using dither (because we wanted to turn down the purge air). We enabled the IMC WFS just for MC optics and steered JM3, but weren't able to center the MC2 trans. Steering JM3 just made the IMC transmission worse while making not much impact on the desired degree of freedon (JM3 PIT -> MC2 trans YAW, JAM3 YAW -> MC2 trans PIT).

Tomorrow, we'll revisit the IMC alignment. We'll also measure the power coming into JAC TRANS PD as well as the actual transmission of JAC while locking it with RF so we can use JAC trans PD as the measure of the power into HAM1.

INS, IOO, ISC

LHO VE - GV6 annulus ion pump (AIP) replaced

travis.sadecki@ligo.org — Mon, 23 Feb 2026 18:47:03 -0800

Author: travis.sadecki@ligo.org

Report ID: 89235

Today, Gerardo replaced the annulus ion pump body for the GV6 annulus system. He then handed off to me to hook up the turbo/aux. cart. The pressure at the cart was ~3e-5 after 4 hours of pumping.

There will be a pump cart running at GV6, at the Y-arm termination slab, until the ion pump transition pressure.

LHO General - Ops Day Shift Summary

ryan.short@ligo.org — Mon, 23 Feb 2026 17:23:47 -0800

Author: ryan.short@ligo.org

Report ID: 89234

TITLE: 02/24 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: N/A
SHIFT SUMMARY: Another productive day with work continuing in HAM1; JM1 is in place and more alignment ongoing.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
22:49	SAF	LVEA is Laser SAFE	LVEA	NO*	LVEA is Laser SAFE Bifurcated HAM1/2	Ongoing
15:45	FAC	Randy	LVEA	N	Walkabout in W-bay	16:25
16:06	FAC	Kim, Nellie	LVEA	N	Technical cleaning	16:25
16:49	FAC	Kim, Nellie	LVEA	N	Technical cleaning	17:27
16:52	VAC	Travis	LVEA	-	Checking purge air @ HAM1	17:07
17:00	JAC	Keita	LVEA	Yes	HAM1 alignment	20:33
17:11	JAC	Betsy	LVEA	Yes	JM1 install	20:32
17:15	SPI	Jeff	OpticsLab	y(local)	SPI work	20:10
17:24	FAC	Randy, Jim	LVEA	n	Test stand work	17:53
17:31	JAC	Jason	LVEA	YES	HAM1 alignment	20:32
17:40	SPI	RyanS	OpticsLab	y(local)	SPI work	20:04
17:45		Camilla, Marc	JOAT Lab	n	Installing ethernet cable	17:59
17:45	FAC	Nellie	MY	n	Tech clean	18:21
17:54	FAC	Randy, Jim	MX, MY	n	Looking for parts	20:45
18:22	TCS	Camilla, Sophie	LVEA	n	Grabbing TCS laptop	18:57
18:38	FAC	Tyler	LVEA, MX, MY	n	3IFO checks	19:42
18:39	VAC	Jordan	LVEA	n	RGA scans	19:50
18:39	VAC	Gerardo	LVEA	YES	Looking for rigging cable	19:50
19:43	FAC	Tyler	JOAT Lab	n	Watching paint chips fall	19:45
19:51	VAC	Gerardo	LVEA	n	Swapping ion pump for GV6	22:00
20:43	VAC	Travis	LVEA	N	Ion pump swap	22:00
20:45	FAC	Randy	LVEA	N	Rigging assembly	21:16
20:46	SPI	Jeff	Opt Lab	Local	SPI work	23:25
21:06	TCS	Sophie, Gabriele, Bin	Prep Lab	Local	CHETA table work	22:51
21:20	TCS	Shreyan	Prep Lab	Local	CHETA table work	22:51
21:41	JAC	Keita, Jason	LVEA	Yes	HAM1 alignment	Ongoing
21:46	JAC	Betsy	LVEA	Yes	HAM1 alignment	00:13
22:14	VAC	Jordan	LVEA	N	Checking AIP @ Y-manifold	22:23
22:45	TCS	Camilla	Prep Lab	Local	CHETA table work	00:16
22:50	ISC	Elenna	Opt Lab	-	Preparing for BHSS	23:19
23:12	TCS	Sophie	Prep Lab	Local	CHETA table work	00:08
23:14	VAC	Travis	LVEA	N	Checking AIP	23:20

H1 IOO - Comment to JAC work Friday Feb/20/2026 (Jennie, Rahul, Keita)

jennifer.wright@ligo.org — Mon, 23 Feb 2026 15:41:10 -0800

Author: jennifer.wright@ligo.org

Report ID: 89233

See results here (alolg #89230).

H1 CDS - Cheta slow controls chassis installed in Vacuum Prep Lab and network connected to the MSR Beckhoff chassis via GC rm163

david.barker@ligo.org — Mon, 23 Feb 2026 15:34:55 -0800

Author: david.barker@ligo.org

Report ID: 89232

WP13034

Fil, Dave, Daniel, Jonathan, Patrick, Sophie, Camilla,

Last week Fil and Daniel powered up the Cheta slow controls Beckhoff chassis in the MSR. It was sitting on a cart behind MSR02, connected to the MSR Chassis AUX-1 ethernet port with a short cat6 cable. Daniel added the AWS system to the SYS ECAT TCS CS PLC.

Today we moved the Cheta chassis into the Vacuum Prep Lab. It ethernt connection to the MSR chassis is now quite convoluted, a drawing can be found in D2600049

From the Cheta chassis the path is: cat6 cable to the wall RJ45 jack, building wiring connects this to the RJ45 patch panel in Room 163. Fil ran a cat6 cable from the patch, under the 163 floor, through a wall penetration to the CUR underfloor, then up to the wall mounted CUR CDS switch. This switch is connected to the MSR core switch, which in turn is connected to the FE switch in MSR04. A cat6 cable from this switch over to the Beckhoff chassis completes the link.

The link was tested in two stages. After Jonathan configured the core switch and the two edge switches to create a private VLAN connecting the switches, Fil moved the chassis into the CUR and connected it to the sw-cur-aux-stk port 1/1/7. I ran the above rack cat6 in the MSR from sw-msr-h1fe-stk 2/1/2 to the MSR chassis.

When powered down in the MSR DEV0 system went into a bad state. The H1:SYS_ETHERCAT_DEVICE_0_LOSTQUEUEDFRAMES channel (normally zero) accrued thousands of frames. The LOSTFRAMES (normally zero) became 13, the SLAVECOUNTACTUAL (normally 19) became zero.

When powered back up in the CUR, DEV0 status went green, the slave count went back to 19. The frame countered latched at their non-zero values. After Patrick reset them they stayed at zero.

Next Fil moved the chassis into the Vacuum Prep Lab, everything went green again and the frame counters stayed zero after reset.

H1 IOO - Comment to JAC work today summary

jennifer.wright@ligo.org — Mon, 23 Feb 2026 15:31:56 -0800

Author: jennifer.wright@ligo.org

Report ID: 89230

FSR = 265 MHz (see this ref and table on P.110).

FSR in s on scan = 8.39 s

For the 9 MHz on the measurement with both sb at nominal power: : 0.0103mA is the upper 9 MHz sb vs. 0.745 mA carrier (left-hand TM00 peak).

m_9 = 2*sqrt(0.0103/0.745) = 0.235

For 45 MHZ in same measurementdata : 0.0151 mA is the upper 45MHz carrier vs. 0.745 mA carrier (left-hand TM00 peak).

m_45 = 2*sqrt(0.0151/0.745) = 0.285

The 9MHz seems similar to this (alog #89001) measurement with the previous crystal (0.26) but the 45MHz is different (0.31).

IOO, ISC

H1 PSL - PSL 10-Day Trends

ryan.short@ligo.org — Mon, 23 Feb 2026 14:24:20 -0800

Author: ryan.short@ligo.org

Report ID: 89231

FAMIS 31126

Not much to report this week. FSS has been on and off due to JAC installation and commissioning.

Images attached to this report

H1 SEI - Picket Fence down to four stations

erik.vonreis@ligo.org — Mon, 23 Feb 2026 11:22:22 -0800

Author: erik.vonreis@ligo.org

Report ID: 89229

Picket Fence earthquake early warning system can't connect to station "UO_TOOM:HHZ", so we're only monitoring on four out of five stations.

LHO VE - Mon CP1 Fill

david.barker@ligo.org — Mon, 23 Feb 2026 10:20:30 -0800

Author: david.barker@ligo.org

Report ID: 89228

Mon Feb 23 10:12:14 2026 INFO: Fill completed in 12min 10secs

Images attached to this report

LHO VE - Comment to Water leak found in Corner Purge Air Compressor Auto Drain Line

travis.sadecki@ligo.org — Mon, 23 Feb 2026 09:32:54 -0800

Author: travis.sadecki@ligo.org

Report ID: 89227

Dewpoints were checked this morning before anyone entered HAM1. See pics for dewpoints at the dryer skid and at the relief valve for HAM1.

Images attached to this report

LHO General - Ops Day Shift Start

ryan.short@ligo.org — Mon, 23 Feb 2026 07:45:29 -0800

Author: ryan.short@ligo.org

Report ID: 89226

TITLE: 02/23 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 16mph Gusts, 12mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.45 μm/s
QUICK SUMMARY: HAM1 work continues today after the purge air issue this weekend.

LHO VE - Comment to Water leak found in Corner Purge Air Compressor Auto Drain Line

gerardo.moreno@ligo.org — Sun, 22 Feb 2026 14:26:21 -0800

Author: gerardo.moreno@ligo.org

Report ID: 89225

(Jordan, Brandon (Rogers Machinery tech), Richard, Betsy, Gerardo)

Purge air update.

Checked the Kobelco unit and the system is running normal, nothing to report. Dryer tower reports a dew point reading of -76.0 °C. I opened the purge air to the LVEA, took an initial dew point measurement at the HAM1 purge port, sorry no photo of reading, but it read -41.2 °C, and after one hour and 30 minutes of purging, a second measurement was taken, dew point reading of -48.2 °C.

Purge admittance valve for HAM1 is open now.

A reminder for others HAM1 has double soft covers for both doors. We were instructed to install the second one on the +Y door.

Note and reminder for others, sometime this week Rogers Machinery technicians are to return to replace the oil pump for the compressor.

Leaving site now.

Images attached to this report

LHO VE - Sun CP1 Fill

david.barker@ligo.org — Sun, 22 Feb 2026 10:21:22 -0800

Author: david.barker@ligo.org

Report ID: 89224

Sun Feb 22 10:10:32 2026 INFO: Fill completed in 10min 28secs

Images attached to this report

LHO VE - Comment to Water leak found in Corner Purge Air Compressor Auto Drain Line

david.barker@ligo.org — Sun, 22 Feb 2026 09:35:11 -0800

Author: david.barker@ligo.org

Report ID: 89223

Here is a trend of the dew point from 17:00 Fri 20th Feb through to 09:00 Sun 22nd Feb.

Images attached to this report

LHO VE - Comment to Water leak found in Corner Purge Air Compressor Auto Drain Line

jordan.vanosky@ligo.org — Sat, 21 Feb 2026 11:52:06 -0800

Author: jordan.vanosky@ligo.org

Report ID: 89222

2/21/26

A tech from Roger's Machinery came out to the the site today to diagnose the issue. It was indeed the ball valve on the aftercooler drain line, the valve body had cracked right through the threads. He swapped the ball valve and cleaned the water from the bottom of the cabinet.

Compressor was restarted, open to the receiving tank and drying towers, but the purge air outlet valve was not opened. No other issues found, the dewpoint at the drying towers dropped quickly (currently at -56C and still dropping).

There is still no purge air going out to the LVEA/HAM1, the compressor/dry air skid will continue to run over the weekend before opening back up to the LVEA purge air line.

Closing WP 13038

Images attached to this report

LHO VE - Sat CP1 Fill

david.barker@ligo.org — Sat, 21 Feb 2026 10:17:54 -0800

Author: david.barker@ligo.org

Report ID: 89221

Sat Feb 21 10:11:00 2026 INFO: Fill completed in 10min 56secs

Images attached to this report

LHO VE - Comment to Water leak found in Corner Purge Air Compressor Auto Drain Line

gerardo.moreno@ligo.org — Fri, 20 Feb 2026 23:09:43 -0800

Author: gerardo.moreno@ligo.org

Report ID: 89220

Kobelco unit

The compressor remains off, the new leak, a coolant leak was found at a ball valve, and it needs to be fixed. We have contacted the vendor and are awaiting on a response.

HAM1 Update

HAM1 remains closed for business until further notice, or a work around can be established.

Caution, watch out for volume on your device, lots of noise present on attached video.

Non-image files attached to this report

CrackedValveTiny.mov

LHO VE - Water leak found in Corner Purge Air Compressor Auto Drain Line

jordan.vanosky@ligo.org — Fri, 20 Feb 2026 17:46:43 -0800

Author: jordan.vanosky@ligo.org

Report ID: 89219

When checking the Kobelco unit this afternoon, I found there was a standing puddle of water (~1/4in deep) on the right side (looking at control screen) of the enclosure. Moving to the back side it was found to be a leak in the aftercooler auto drain line, right at the isolation ball valve. There was a continuous spray of water coming from the threads on the upstream side of the ball valve.

The dewpoint at the drying towers was still -81C, same value as this morning, so it did not cause any issues downstream of the compressed air line. The drained water was simply collecting in the bottom of the enclosure instead of flowing out of the drain line.

There was no in-chamber work happening at HAM1 at the time of discovery so after a phone call with Gerardo, I shut down the compressor unit and isolated the air line between the compressor and the receiving tank. I then closed the purge air inlet valve at the HAM1 chamber.

There is currently no purge air going to the LVEA.

Images attached to this report

H1 IOO - JAC work today summary

jennifer.wright@ligo.org — Fri, 20 Feb 2026 17:26:39 -0800

Author: jennifer.wright@ligo.org

Report ID: 89218

Jennie W, Keita K, Rahul K, Ryan S,

This morning Keita turned the power up to 1 W and the purge air down in order to scan the OMC and measure the modulation index.

We had some work to do to lock the JAC, the cavity wouldn't scan properly when managed by the guardian code.

Ryan and I have looked back at it and think there may be something wrong with the feedback to the PZT. It can't be the PZT itself though, because Keita and I were able to lock on the TRANS PD signal with the dither locking done manually by tuning the PZT offset to find the resonance and then turning on the feedback.

I have enclosed a picture to aid problem solving next week.

We then had problems keeping the IMC locked so Keita had to change the threshold used to check if the cavity is locked down to 2. This was changed at line 133 in ISC_library.py at userapps/h1/isc/guardian/.

trans_pd_lock_threshold = 2

We then managed to do three scans,

one with 45 MHz off, one with both on, and one with 9 MHz off. Detailed analysis in progress.

After turning the power back down Keita and Rahul swapped the mirror we currently have in front of the TRANS PD, with the uncoated laser window that is meant to be there (JACT_BS1).

They had to top gun and swab it to remove two dust particles first.

This replacement means the power to the PD is lower and so we needed to power up to 1W to check this alignment.

I have left the mirror we took out on the table on the -Y side labelled as 'HR mirror taken out of JACT-BS1'. Need to check which exact mirror this is with Masayuki on Monday.

Keita locked the cavity manually with the REFL PD and optimised the amount of light falling onto the TRANS PD.

I powered down to 100mW and de-energised the rotation stage and closed the light pipe at the end of the day. We also had the rotation stage de-energised and locked out when we were working in chamber.

ISC

Images attached to this report

H1 IOO - JAC work Friday Feb/20/2026 (Jennie, Rahul, Keita)

keita.kawabe@ligo.org — Fri, 20 Feb 2026 16:49:51 -0800

Author: keita.kawabe@ligo.org

Report ID: 89217

Modulation index measurement for 45M and 9M, they're healthy.

1W into JAC, no WFS for IMC, ITMY single bounce. Scanned OMC with both 45MHz minimal power (~4dBm) and 9MHz full (~27dBm), then both in full power, then only 45MHz in full (see screen shot).

Jennie will post the modulation index later, but the peaks look healthy to me.

The alignment into IMC was rather off in PIT and the guardian had a hard time locking IMC (I changed the lock threshold in the guardian). We didn't move MC, didn't bother to do any thorough investigation, but either JAC or MC mirrors moved. Maybe we have to lock IMC, use WFS for MC, and steer JM3 and see if the MC mirrors will be driven far from where they are. If they are we might have to touch up in-chamber alignment again.

JAC TRANS BS was swapped with the real one (laser window with AR only on one surface).

We replaced the JAC TRANS BS (which was a temporary high reflector until today) with the real one that is just a bare glass (the reflectivity is 7% or so depending on AOI).

We locked JAC with RF, was able to see the beam coming to the TRANS PD but wasn't able to see the reflection of PD, so we raised the power to 1W.

Initially the beam was missing the PD because the new optic is thinner than the temporary one. We realigned the optic to steer the beam back to PD. Since we could not directly see the PD surface, we just steered the beam up and down, left and right until the PD output starts to drop, and put the beam roughly in the middle.

We were able to see the PD reflection using an IR card and an IR viewer. There were two reflection blobs (which was the case before, too), and I moved the JAC TRANS BD in +X direction by 1/4~3/8" to catch both.

INS, IOO, ISC

Images attached to this report

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Fri, 20 Feb 2026 15:57:55 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 89216

TITLE: 02/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in IDLE for PLANNED MAINTENANCE

Calm day. HAM1 work continued.

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
22:49	SAF	LVEA is Laser SAFE	LVEA	NO*	LVEA is Laser SAFE Bifurcated HAM1/2	16:49
15:42	FAC	Randy	LVEA	N	Looking at test stand	16:15
15:42	FAC	Nellie	LVEA	Y	Technical Cleaning	18:35
16:48	VAC	Jordan	LVEA	N	Checking on HAM7	16:53
17:33	ISC	Keita	LVEA	Y	HAM1 Lightpipe	18:33
18:35	EPO	Maggie + 30	Overpass	N	Touring	19:24
19:40	EPO	Cassidy	Overpass +30	N	Touring	20:31
20:31	PEM	Robert	EX	N	Grounding measurement	21:44
21:07	OPS	Ryan S	Optics Lab	Y	SPI Work	23:17
21:23	ISC	Rahul, Keita	LVEA	Y	HAM1, rahul out at 23:15UTC	23:24
21:47	ISC	Jennie	LVEA	Y	HAM1	23:47
23:36	PEM	Robert	EX	N	Grounding measurement	01:36

H1 General - Quarterly trends of HWWD bits for indication of negative function

anthony.sanchez@ligo.org — Fri, 20 Feb 2026 14:56:12 -0800

Author: anthony.sanchez@ligo.org

Report ID: 89215

Famis 39976 Inspect quarterly trends of HWWD bits for indication of negative function.

All traces have had some motion on it in the last 91 days.

Images attached to this report

H1 SUS - SUS HRTS LO2 optic-prism glued

rahul.kumar@ligo.org — Fri, 20 Feb 2026 13:20:25 -0800

Author: rahul.kumar@ligo.org

Report ID: 89214

Yesterday afternoon I glued prisms to the LO2 optic for HRTS - see pictures attached.

This optic (D2100495-V5-LO2-M1-0002) will be shipped to LLO.

SUS

Images attached to this report

H1 SEI - SEI seismometer mass position check - Monthly

anthony.sanchez@ligo.org — Fri, 20 Feb 2026 11:51:11 -0800

Author: anthony.sanchez@ligo.org

Report ID: 89213

Famis 38888 SEI seismometer mass position check - Monthly :

Checking T240
Checking STS
Finished
Averaging Mass Centering channels for 10 [sec] ...
2026-02-20 11:36:02.279522

There are 12 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 2 DOF X/U = -1.716 [V]
ETMX T240 2 DOF Y/V = -1.819 [V]
ETMX T240 2 DOF Z/W = -0.998 [V]
ITMX T240 1 DOF X/U = -2.377 [V]
ITMX T240 1 DOF Z/W = 0.459 [V]
ITMX T240 3 DOF X/U = -2.547 [V]
ITMY T240 3 DOF X/U = -1.089 [V]
ITMY T240 3 DOF Z/W = -3.077 [V]
BS T240 2 DOF Z/W = 0.346 [V]
BS T240 3 DOF X/U = -0.518 [V]
HAM8 1 DOF Y/V = -0.428 [V]
HAM8 1 DOF Z/W = -0.728 [V]

All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = -0.006 [V]
ETMX T240 1 DOF Y/V = -0.037 [V]
ETMX T240 1 DOF Z/W = -0.03 [V]
ETMX T240 3 DOF X/U = -0.024 [V]
ETMX T240 3 DOF Y/V = -0.07 [V]
ETMX T240 3 DOF Z/W = -0.043 [V]
ETMY T240 1 DOF X/U = 0.057 [V]
ETMY T240 1 DOF Y/V = 0.198 [V]
ETMY T240 1 DOF Z/W = 0.253 [V]
ETMY T240 2 DOF X/U = -0.087 [V]
ETMY T240 2 DOF Y/V = 0.215 [V]
ETMY T240 2 DOF Z/W = 0.046 [V]
ETMY T240 3 DOF X/U = 0.268 [V]
ETMY T240 3 DOF Y/V = 0.085 [V]
ETMY T240 3 DOF Z/W = 0.136 [V]
ITMX T240 1 DOF Y/V = 0.289 [V]
ITMX T240 2 DOF X/U = 0.131 [V]
ITMX T240 2 DOF Y/V = 0.257 [V]
ITMX T240 2 DOF Z/W = 0.242 [V]
ITMX T240 3 DOF Y/V = 0.119 [V]
ITMX T240 3 DOF Z/W = 0.061 [V]
ITMY T240 1 DOF X/U = 0.062 [V]
ITMY T240 1 DOF Y/V = 0.159 [V]
ITMY T240 1 DOF Z/W = 0.027 [V]
ITMY T240 2 DOF X/U = 0.021 [V]
ITMY T240 2 DOF Y/V = 0.243 [V]
ITMY T240 2 DOF Z/W = 0.16 [V]
ITMY T240 3 DOF Y/V = 0.082 [V]
BS T240 1 DOF X/U = 0.261 [V]
BS T240 1 DOF Y/V = -0.212 [V]
BS T240 1 DOF Z/W = -0.179 [V]
BS T240 2 DOF X/U = 0.142 [V]
BS T240 2 DOF Y/V = -0.271 [V]
BS T240 3 DOF Y/V = 0.061 [V]
BS T240 3 DOF Z/W = -0.263 [V]
HAM8 1 DOF X/U = -0.3 [V]

Assessment complete.
Averaging Mass Centering channels for 10 [sec] ...

2026-02-20 11:36:14.268587
There are 2 STS proof masses out of range ( > 2.0 [V] )!
STS EY DOF X/U = -4.582 [V]
STS EY DOF Z/W = 2.384 [V]

All other proof masses are within range ( < 2.0 [V] ):
STS A DOF X/U = -0.51 [V]
STS A DOF Y/V = -0.798 [V]
STS A DOF Z/W = -0.581 [V]
STS B DOF X/U = 0.108 [V]
STS B DOF Y/V = 0.953 [V]
STS B DOF Z/W = -0.309 [V]
STS C DOF X/U = -0.871 [V]
STS C DOF Y/V = 0.868 [V]
STS C DOF Z/W = 0.593 [V]
STS EX DOF X/U = 0.507 [V]
STS EX DOF Y/V = -0.551 [V]
STS EX DOF Z/W = -0.392 [V]
STS EY DOF Y/V = 1.204 [V]
STS FC DOF X/U = 0.153 [V]
STS FC DOF Y/V = -1.174 [V]
STS FC DOF Z/W = 0.637 [V]

Assessment complete.
Results copied to clipboard

LHO VE - Fri CP1 Fill

david.barker@ligo.org — Fri, 20 Feb 2026 10:56:04 -0800

Author: david.barker@ligo.org

Report ID: 89212

Fri Feb 20 10:13:20 2026 INFO: Fill completed in 13min 17secs

Images attached to this report

H1 TCS - CHETAX

daniel.sigg@ligo.org — Fri, 20 Feb 2026 10:26:37 -0800

Author: daniel.sigg@ligo.org

Report ID: 89211

The slow controls software was updated to include the ChetaX electronics. The chassis is currently in the MSR for test purposes, but will be moved to the cheta lab next week.

Channels are located under H1:AWC-ITMX.

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Fri, 20 Feb 2026 07:41:59 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 89210

TITLE: 02/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 14mph Gusts, 10mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.21 μm/s
QUICK SUMMARY:

IFO is IDLE for PLANNED MAINTENANCE

JAC/HAM1 work continues

H1 CDS - Comment to h1iscex TIM+ADC error

david.barker@ligo.org — Fri, 20 Feb 2026 07:41:42 -0800

Author: david.barker@ligo.org

Report ID: 89209

May have been due to in-rack work. Robert may have been working on ground investigations at the time, the EX lights were not turned off until 17:49 (+23 mins from glitch).

H1 CDS - Comment to h1ascimc restarted and DAQ restarted

david.barker@ligo.org — Fri, 20 Feb 2026 07:36:24 -0800

Author: david.barker@ligo.org

Report ID: 89208

There were some issues with the new code, so we reverted h1ascimc back to its original code at 13:40. We will try again next week.

When h1ascimc was restarted by itself, h1iopasc0 ran long and reported a DAC error, though on the 16bit-DAC MEDM there were no associated FIFO errors reported.

When h1ascimc was started as part of a complete model restart (rtcds start --all) this DAC error does not appear.

The DAC error is clearable by DIAG-RESET'ing the IOP, but we are unsure if the DAC is a cycle behind at this point. At the moment the safest restart if DAC errors appear is a full restart of all models.

H1 CDS - h1iscex TIM+ADC error

david.barker@ligo.org — Thu, 19 Feb 2026 20:06:01 -0800

Author: david.barker@ligo.org

Report ID: 89207

At 17:26 Thursday 19feb2026 h1iopiscex had a timing glitch causing a TIM+ADC error in its state word.

At 20:00 I restarted all the models which cleared the error.

Images attached to this report

H1 IOO - Comment to JAC work Thu. Feb/19/2016 morning (Mitch, Jennie, Jason, Betsy, Keita)

keita.kawabe@ligo.org — Thu, 19 Feb 2026 18:30:21 -0800

Author: keita.kawabe@ligo.org

Report ID: 89205

Afternoon work, REFL path aligned, RF lock works (Jennie, Jason, Betsy, Daniel, Keita)

It seemed as if what was supposed to be TFP after HWP was not really TFP, it was temporarily set aside.

REFL path to the JAC REFL RFPD was aligned without TFP. 100mW into JAC was enough to see the REFL beam there.

DC responded as expected.

There was a confusion about which demod chassis was used for JAC, which was sorted out by Daniel who subsequently set the demod phase. I zero-ed the dark offset.

I copied the JAC lock filter from dither path to JAC-L_SERVO path, locked JAC with dither, disabled the input to the dither servo and enabled RF locking in parallel, which worked just fine. I made rough changes to the RF servo to bump up the UGF to ~400Hz without too much gain peaking, I haven't tried anything aggressive to squash the residual motion below 200Hz, you might want to tweak it further.

I didn't disable the dither itself for the JAC PZT so we can compare the spectrum of RF and dither side by side. See attached, this was measured with 100mW into JAC, note that the dither error signal is scaled. References are with the purge air on and current traces are with the purge air completely turned down.

Guardian needs to be changed to allow smooth locking with RF.

Images attached to this report

H1 IOO - JAC work Thu. Feb/19/2016 morning (Mitch, Jennie, Jason, Betsy, Keita)

keita.kawabe@ligo.org — Thu, 19 Feb 2026 18:15:30 -0800

Author: keita.kawabe@ligo.org

Report ID: 89197

Beam dump for HAM1-HAM2 septum window AR reflection.

This was installed.

Beam dump for the -Y door viewport reflection.

Jason and Betsy installed it. There seems to be a discussion as to whether or not something else needs to be done.

EOM and JAC power budget again.

We measured the power at various places. While Jason held the power meter head still, I ran the statistics function of the power meter for a few seconds. I only list the mean and the standard deviation.

Wrong pol is king of large, ~0.2% of the main beam power coming out of EOM. That's 200mW when 100W goes through the EOM.

JAC throughput of 92% is not great, but Jason says the alignment and the matching are not really optimised.

JAC input	112mW+-462uW
EOM input = JAC output	103mW+-6.3mW	JAC OUT/IN = 0.92+-0.06
EOM front AR reflection	57uW+-4.4uW	EOM AR/IN = (5.5+0.5)*1e-4
EOM output (including the wrong pol beam)	96.9mW+-1.4mW
EOM wrong pol beam	226uW+-17uW	EOM wrong pol/IN = (2.2+-0.2)*1e-3
EOM main pol (= out total - wrong pol)	96.7mW +-1.4mW	EOM main pol/IN = .9978+-2e-4

INS, IOO, ISC

Images attached to this report

H1 CDS - Comment to Update to JAC & IMC ASC models

jennifer.wright@ligo.org — Thu, 19 Feb 2026 17:56:47 -0800

Author: jennifer.wright@ligo.org

Report ID: 89206

Jennie W, Dave B, EJ D, Erik V, Keita K, Daniel S, Jeff K, Olli P,

This morning I rebuilt the model again before it was restarted to add back in the IMC-PZT_PIT_OUT_DQ and H1:IMC-PZT_YAW_OUT_DQ channels in the top level of h1ascimc so as to avoid removing these channels from the GDS broadcast channel list.

Unfortunately this change did not get propagated to the live model today (it was not built with the rev-locked tag). This caused some confusion when the model + DAQ restart happened ( alog #89196). I had forgotten to SDF the PZT sliders for IMC-PZT_OUT and so this mis-aligned the beam to the JAC. Keita brought this back by altering the IMC sliders and we were able to continue with optics work in HAM1.

On the CDS side, none of my changes from today or yesterday have been uploaded to the 'rev-locked version of the model so everything was restarted with the old model config from yesterday morning. We will aim to restart with model changes to h1ascimc (that I made last night and this morning) at sometime Monday morning.

IOO, ISC

Images attached to this report

H1 SUS - PM1, RM1, RM2, JM1, JM3 COILOUT/DAMP filters updated to solve our confusion

oli.patane@ligo.org — Thu, 19 Feb 2026 16:42:32 -0800

Author: oli.patane@ligo.org

Report ID: 89198

Rahul, Jeff, Oli

In December 2025 when we needed to compensate for the HAM1 DACs moving from 16- to 28-bit, we had decided to have FM10 in the COILOUTF bank be gain(1024), and put the remaining gain(4) upstream in multiple other places (88553). This led to our confusion today when we realized that when taking transfer functions for PM1 and JM3, the TEST banks had gone back to gains of 1 a couple weeks ago, and since we had damping off, the extra gain wasn't going through to the excitation. This might at least partially be why PM1 had dropped in magnitude, and why the JMs are so low in magnitude too.

To solve confusion, I've gone through PM1, RM1, RM2, JM1, and JM3 and removed the extra gain(4) that's in:
- DAMP bank FM4
- TEST bank gains (if still there)
- OPTICALIGN gains
- LOCK filter bank gains
Then I updated the gains in COILOUTF FM10 from gain(1024) to gain(4096).

I've sdf'd the values and loaded in the changed filter modules. I also committed the filter file.

*To remove future confusion about the difference in value of the "28BitDAC" filter module in COILOUTF FM10, I am going to go through all the suspensions and change the name of that filter from "28BitDAC" to be something like "16to28Bit" or "18to28Bit" depending on the previously used DAC bits

CDS

H1 General - Ops DAY Shift Start

oli.patane@ligo.org — Thu, 19 Feb 2026 16:39:29 -0800

Author: oli.patane@ligo.org

Report ID: 89204

TITLE: 02/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: More HAM1 alignment work today
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
22:49	SAF	LVEA is Laser SAFE	LVEA	NO*	LVEA is Laser SAFE Bifurcated HAM1/2	16:49
15:00	FAC	Nellie	LVEA	YES	Tech clean	15:04
15:00	FAC	Kim	LVEA	YES	Tech clean	15:38
15:30	FAC	Randy	LVEA	n	Working on test stand	19:58
16:17	VAC	Jordan	LVEA	YES	Turning down HAM1 purge air, HAM7 continuing leak checks	16:24
16:30	EE	Fil	MER	n	Electronics work	18:32
16:36	FAC	Kim	LVEA	YES	Tech clean	17:23
17:13	JAC	Keita	LVEA	YES	JAC alignment	20:11
17:13	VAC	Gerardo	LVEA	YES	Turning up HAM1 purge air	17:17
17:20	EE	Marc	MER	n	Joining Fil for electronics rack work	18:32
17:22	JAC	Jason	LVEA	YES	JAC alignment	20:23
17:59	VAC	Jordan, Travis	LVEA	n	HAM7 leak checks	18:23
18:21	SPI	RyanS	OpticsLab	y(local)	SPI setup	21:42
18:24	JAC	Jennie	LVEA	YES	JAC alignment	20:11
18:39		Betsy	LVEA	YES	JAC work	20:23
18:50	JAC	Rahul	LVEA	YES	Checking on JAC team	19:02
18:51	SUS	Ibrahim	LVEA	n	Helping Randy at test stand	19:58
19:10	VAC	Gerardo, Jordan, Travis	LVEA	n	CP1 pump	20:11
19:14	SPI	Jeff	OpticsLab	y(local)	SPI work	21:42
20:07	PEM	Robert	EX	n	Grounding himself	21:23
20:49	FAC	Randy	LVEA	n	Test stand work	23:01
21:21	TCS	Sophie	JOAT Lab	n	Taking photos	21:39
21:55		Betsy	LVEA	YES	Opening light pipe	21:57
21:56	TCS	Sophie	JOAT Lab	n	Taking more pictures	22:03
22:03	FAC	Ibrahim	LVEA	n	Test stand work	23:01
22:43	JAC	Jason, Keita	LVEA	YES	JAC alignment	00:43
22:48	EE	Marc	LVEA	n	Cable intel	23:44
22:55	TCS	Sophie, Shreyan	JOAT Lab	n	Populating tables	ongoing
23:01	SPI	RyanS	OptLab	n	Setting up SPI	00:23
23:03	JAC	Jennie	LVEA	YES	JAC alignment	ongoing
23:11	FAC	Tyler, 2 contractors	LVEA	n	Checking out HVAC equipment	23:36
23:25	JAC	Betsy	LVEA	YES	JAC allignment	00:06
23:26	SPI	Jeff	OptLab	n	SPI work	00:18
23:35	EE	Tony, Fil	LVEA	N	Grabbing Ladder	23:57

H1 SUS - 2nd HRTS OM0 Optic-Prisms glued - for LHO

rahul.kumar@ligo.org — Thu, 19 Feb 2026 16:06:03 -0800

Author: rahul.kumar@ligo.org

Report ID: 89203

RyanC, Rahul

We glued prisms (primary - sapphire and secondary - metal) to the HRTS OM0 fused silica Optic, meant for LHO (D2100495-V5-OM0-02).

Attaching two pictures below for reference - they show the two prism glued to the barrel and the four magnet bases on the AR side of the optic.

I will post the details about its metrology later on.

---

OM0 optic meant for LLO has already been processed (i.e. prim glued) and shipped in Jan2026 - see alog 88786 for details.

SUS

Images attached to this report

H1 AOS - CHETA updates

sophie.muusse@ligo.org — Thu, 19 Feb 2026 14:13:23 -0800

Author: sophie.muusse@ligo.org

Report ID: 89200

S. Muusse, C. Compton, S. Goswami

We started populating and aligning optics on the second table. Most optics are now mounted and the beam is aligned upto M3 as per the fintrace model. We have aligned with the PD pick off in to save realignment later.

Construction begun on the camera can (D1300703) but did not get far as the screws which are fixed into the side panels (D2500165) are not long enough to reach the nuts attached to the other face of the box. Pictures of these components are attached.

We attached the viewport housing on the table which fits as expected. (photos attached)

Images attached to this report

Non-image files attached to this report

0920_gtrace_layout.pdf

H1 PSL - PSL Status Report Weekly FAMIS

oli.patane@ligo.org — Thu, 19 Feb 2026 14:11:11 -0800

Author: oli.patane@ligo.org

Report ID: 89202

Closes FAMIS#39752, last checked 89164

Laser Status:
NPRO output power is 1.841W
AMP1 output power is 70.47W
AMP2 output power is 138.8W
NPRO watchdog is GREEN
AMP1 watchdog is GREEN
AMP2 watchdog is GREEN
PDWD watchdog is GREEN

PMC:
It has been locked 0 days, 2 hr 51 minutes
Reflected power = 26.95W
Transmitted power = 104.0W
PowerSum = 131.0W

FSS:
It has been locked for 0 days 0 hr and 0 min
TPD[V] = 0.4856V

ISS:
The diffracted power is around 3.8%
Last saturation event was 0 days 2 hours and 9 minutes ago

Possible Issues:
PMC reflected power is high

LHO FMCS - HVAC Fan Vibrometers Check FAMIS

oli.patane@ligo.org — Thu, 19 Feb 2026 14:07:04 -0800

Author: oli.patane@ligo.org

Report ID: 89201

Closes FAMIS#39855, last checked 89138

Corner Station Fans (attachment1)
- All fans are looking normal and within range.

Outbuilding Fans (attachment2)
- All fans are looking normal and are within range.

PEM

Images attached to this report

LHO VE - Leak Checking of the HAM7 +Y door ports and the Relay Tube

jordan.vanosky@ligo.org — Thu, 19 Feb 2026 13:37:31 -0800

Author: jordan.vanosky@ligo.org

Report ID: 89199

Now that HAM7 is at sufficient pressure (6.4E-7 Torr as of this post) we helium leak checked the two re-installed 12" CF blanks removed for table locking and the entire relay tube assembly which had been removed for the viewport adapter on HAM5.

The Helium background was unstable, so we turned on the HAM7 cleanroom (on 2/18 afternoon) to help flush the area of helium overnight.

Today the background stabilized around 1.5E-10 Torr-l/s, so we were able to continue leak checking. No significant helium signal observed above the leak detector background which hovered between 1.5&2E-10 Torr-l/s during leak checking.

HAM7 continues to pump down with the turbopump, next steps are chamber RGA scans.

Images attached to this report

H1 CDS - h1ascimc restarted and DAQ restarted

erik.vonreis@ligo.org — Thu, 19 Feb 2026 12:13:46 -0800

Author: erik.vonreis@ligo.org

Report ID: 89196

DAQ was restarted around 12:02 PM PST after restarting h1ascimc.

H1 SUS - Comment to PM1 troubleshooting log

daniel.sigg@ligo.org — Thu, 19 Feb 2026 10:46:54 -0800

Author: daniel.sigg@ligo.org

Report ID: 89195

Is this a difference of the coils or sensors? One thing that changed was the LIGO DAC. Could there be a factor of 4 difference in gain due to a confusion between 18-bit, 20-bit, and LIGO DACs?

LHO VE - Thu CP1 Fill

david.barker@ligo.org — Thu, 19 Feb 2026 10:39:13 -0800

Author: david.barker@ligo.org

Report ID: 89194

Thu Feb 19 10:12:02 2026 INFO: Fill completed in 11min 58secs

Images attached to this report

H1 SUS - JM3 TFs after OSEM centering

oli.patane@ligo.org — Thu, 19 Feb 2026 09:33:01 -0800

Author: oli.patane@ligo.org

Report ID: 89193

Yesterday afternoon Rahul centered the OSEM flags on JM3 (89187). This morning I took another set of transfer functions to check that they're looking good. Flags are well centered (pic), and transfer functions are looking good (TFs).

Settings:
- ISI Locked
- OFFSETs OFF
- DAMP OFF
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/SAGM1/Data/2026-02-19_1645_H1SUSJM3_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
r12913
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/Results/2026-02-19_1645_H1SUSJM3_M1_ALL_TFs.pdf
r12914

Images attached to this report

Non-image files attached to this report

2026-02-19_1645_H1SUSJM3_M1_ALL_TFs.pdf

H1 SUS - PM1 troubleshooting log

oli.patane@ligo.org — Thu, 19 Feb 2026 08:37:03 -0800

Author: oli.patane@ligo.org

Report ID: 89184

Rahul, Fil, Oli

We still don't know why PM1 looks different now than it did when we installed it back in May 2025. Currently, we've nailed it down to two possibillities: (1) there's an issue with PM1 somewhere between the satamp and the in-chamber stuff, or (2) the December 2025 satamp swap to a modified satamp changed the magnitude of PM1 (we are not sure if this makes sense).

Here are some measurements we took yesterday and the things we've looked at so far.

Satamp

We were worried about the satamp, which is a dual satamp, swapped in in December 2025 (88590), with JM3 taking up the other half, so I took some transfer functions yesterday morning for both PM1 and JM3. I compared JM3 now to how it looked when we first installed it in December 2025, and it looks exactly the same, no drop in magnitude for JM (JM3 Dec2025 vs Feb 2026), and no increase in magnitude for PM1 (PM1 May 2025 vs Feb 2026).

Fil then swapped all the PM1 cables on the satamp with all the JM3 cables on the satamp. This made it so the only difference between the previous and these measurements is the part of the satamp used. These measurements for PM1 and JM3 still looked the same as the earlier measurement, so it's not the satamp (PM1 JM3 comparison). These comparison plots really show how much PM1 changed compared to JM3.

All other in-air electronics

The only other difference from the measurements last May for PM1 should be the coil driver, since the other one failed (88998). The new coil driver is modified, just like the old one, and is being correctly compensated for in the coil drive filter banks. To check this, as well as the rest of the in-air electronics, Fil swapped everything back to nominal EXCEPT for the cables that run from the sat amp out to the chamber. This way, JM3 is using the in-air electronics from PM1, and PM1 is using the in-air electronics from JM3. I did a few transfer functions looking for any difference but both suspensions and electronics chains still look the same(PM1 L, PM1 P, JM3 P). This could mean that the issue with PM1 is due to something in the satamp-to-chamber cable or in vacuum.

OSEMs

We checked the spectra for the PM1 BOSEMs but we did it while the purge air was up, so they're very noisy and not very useful.

Satamp question

The only other thing we can think of that could've changed the magnitude of PM1 but not affect what we're seeing in JM3 would be due to the satamp swap in December. The new modified satamp was hooked up to PM1 and JM3 on December 18, 2025 (88588). JM3 was first tested the next day, and obviously we never got a measurement of JM3 with an unmodified satamp, so if it's possible for the satamp to change the magnitude of PM1, that might be what is happening. I haven't had time yet to check whether other suspensions show anything like that.

Measurement info
PM1
2026-02-18 1600
- ISI Locked
- alignment offsets OFF
- DAMP OFF for measured DOF, ON for other DOFs
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Data/2026-02-18_1600_H1SUSPM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
12905
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Results/2026-02-18_1600_H1SUSPM1_M1_ALL_TFs.pdf
12909

2026-02-18 1715
- satamp inputs swapped with JM3 (tfs look the same)
- ISI Locked
- alignment offsets OFF
- DAMP OFF
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Data/2026-02-18_1715_H1SUSPM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
12906
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Results/2026-02-18_1715_H1SUSPM1_M1_ALL_TFs.pdf
12909

JM3
2026-02-18 1600
- ISI Locked
- DAMP OFF
- alignment offsets OFF
- DAMP OFF for measured DOF, ON for other DOFs
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/SAGM1/Data/2026-02-18_1600_H1SUSJM3_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
r12904
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/SAGM1/Results/2026-02-18_1600_H1SUSJM3_M1_ALL_TFs.pdf
r12908

2026-02-18 1730
- satamp inputs swapped with PM1 (tfs look the same)
- ISI Locked
- alignment offsets OFF
- DAMP OFF
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/SAGM1/Data/2026-02-18_1730_H1SUSJM3_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
12907
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/SAGM1/Results/2026-02-18_1730_H1SUSJM3_M1_ALL_TFs.pdf
r12908

Comparisons
PM1 May 2025 vs PM1 Feb 18 2026
/ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2026-02-18_PM1_May2025vsFeb182026_ALL_TFs.pdf
r12911

JM3 Dec 2025 vs JM3 Feb 18 2026
/ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2026-02-18_JM3_Dec2025vsFeb182026_ALL_TFs.pdf
r12912

JM3 Dec 2025 vs JM3 Feb 18 2026 vs PM1 May 2025 vs PM1 Feb 18 2026
/ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2026-02-18_PM1_JM3_PM1looksdifferent_ALL_TFs.pdf
r12910

Images attached to this report

Non-image files attached to this report

allhttss_2026-02-18_JM3_Dec2025vsFeb182026_ALL_TFs.pdf

allhttss_2026-02-18_PM1_May2025vsFeb182026_ALL_TFs.pdf

allhttss_2026-02-18_PM1_JM3_PM1looksdifferent_ALL_TFs.pdf

2026-02-18_1600_H1SUSPM1_M1_ALL_TFs.pdf

2026-02-18_1715_H1SUSPM1_M1_ALL_TFs.pdf

2026-02-18_1600_H1SUSJM3_M1_ALL_TFs.pdf

2026-02-18_1730_H1SUSJM3_M1_ALL_TFs.pdf

H1 General - Ops DAY Shift Start

oli.patane@ligo.org — Thu, 19 Feb 2026 07:33:19 -0800

Author: oli.patane@ligo.org

Report ID: 89192

TITLE: 02/19 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 17mph Gusts, 10mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.36 μm/s
QUICK SUMMARY:

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