aLIGO LHO Logbook

LHO General - Potable Supply Valved Out to All Buildings

tyler.guidry@ligo.org — Fri, 04 Apr 2025 17:18:38 -0700

Author: tyler.guidry@ligo.org

Report ID: 83745

I received a call from Oli at 11:46 this morning informing me that water pressure at the building had fallen. I logged into the FMCS remotely and found that the potable holding tank had been completely drained and only one RO was making water. Before leaving home to come out to site, I contacted Randy and had him manually disable the domestic pressure skid and force the second RO skid on. At this point, because of the known leak, Richard and I have decided that the RO system will replenish the potable holding tank but that the water supply will remain valved out so as not to continue to tax the entire water treatment plant. C&E Trenching who had already been slated to come make the repairs next week has been contacted. After explaining the current situation, they have graciously agreed to move us up in their schedule and will be on site Monday Morning to being the work. Once the repair is made, water should be restored. T. Guidry

LHO VE - 2025 April vent - VAC diary

janos.csizmazia@ligo.org — Fri, 04 Apr 2025 15:38:09 -0700

Author: janos.csizmazia@ligo.org

Report ID: 83744

Today's activities: - All the turbos have been valved out and switched off - The corner was vented through the Y-manifold vent valve, with 3-4 Torr/min speed - it took 3.5 hrs - As a side effect, the current of GV5's AIP went up, so now this Annulus volume is being pumped with an aux cart - Another aux cart is pumping the RGA in the corner (between HAM5 and HAM4)

H1 General - Ops Day Shift End

oli.patane@ligo.org — Fri, 04 Apr 2025 14:46:56 -0700

Author: oli.patane@ligo.org

Report ID: 83743

TITLE: 04/04 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Done early for today! The corner is vented! It's possible that not everything got finished today due to a lack of water pressure causing people to leave early, but at least all of the most important tasks have been completed, if not all of them.

DONE VAC - Checklist for corner vent
DONE VAC - Vent corner
? VAC - 1000 AMU RGA work
DONE FAC - Wipe down and crane 1st gantry over IMC tube and fit check at HAM1
DONE FAC - Wipe and install platforms around HAM1
? FAC - Cleanup furniture in South Bay to make room

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:37	FAC	Randy, Mitchell	LVEA	n	Craning	16:52
15:54	FAC	Kim	LVEA	n	Tech clean	17:42
16:09	VAC	Jordan, Gerardo, Janos	LVEA	n	Corner vent	21:41
16:57	ISC	Rahul, Siva, Mayank	OpticsLab	y(local)	ISS Array (Siva out 18:31)	20:03
17:29	FAC	Mitchell	MY	n	Looking for parts	17:57
17:30	ISC	Jennie	OpticsLab	y(local)	ISS Array	18:30
17:54	PCAL	Tony	PCAL Lab	y(local)	Measurement	18:32
17:58	FAC	Mitchell	LVEA	n	Installing HAM1 ISI installation fixture	19:02
19:14	VAC	Janos	EY	n	Picking up equipment	20:07
20:32	PCAL	Tony	PCAL Lab	y(local)	Getting ready for weekend lab mode	20:40
20:38	FAC	Tyler	LVEA	n	Kickin tires with the VAC guys	20:49

LHO VE - Comment to Fri CP1 Fill

david.barker@ligo.org — Fri, 04 Apr 2025 10:22:53 -0700

Author: david.barker@ligo.org

Report ID: 83742

For the duration of the vent I have removed PT132_MOD2 gauge from the alarm system.

LHO VE - Fri CP1 Fill

david.barker@ligo.org — Fri, 04 Apr 2025 10:21:40 -0700

Author: david.barker@ligo.org

Report ID: 83741

Fri Apr 04 10:06:13 2025 INFO: Fill completed in 6min 10secs

Images attached to this report

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Fri, 04 Apr 2025 07:36:46 -0700

Author: oli.patane@ligo.org

Report ID: 83740

TITLE: 04/04 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 6mph Gusts, 4mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY:

Today's a pretty light day, mostly just venting the corner and some work around HAM1 to prepare for the ISI installation. Here's what's planned:

VAC - Checklist for corner vent
VAC - Vent corner
VAC - 1000 AMU RGA work
FAC - Wipe down and crane 1st gantry over IMC tube and fit check at HAM1
FAC - Wipe and install platforms around HAM1
FAC - Cleanup furniture in South Bay to make room

LHO General - Comment to OPS Day Shift Summary

oli.patane@ligo.org — Thu, 03 Apr 2025 18:46:50 -0700

Author: oli.patane@ligo.org

Report ID: 83739

Other stuff that happened today:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
21:11	EPO	Mike, Dutch Envoy	EY	N	Diplomacy	22:03
21:28	PEM	RyanC	LVEA	NN	Check on DM10	21:34
21:50	PEM	RyanC	LVEA	N	Check on DM10 again	21:55
22:07	PEM	RyanC	LVEA	N	Third time's the charm	22:18
22:50	PCAL	Tony	PCAL Lab	y(local)	Setting up a measurement	23:01
23:02	EPO	Camilla, Matt, tour	LVEA	n	Tour	23:37
23:24	tour	Ibrahim, +1	LVEA	n	tour	23:42
23:43	ISC	Mayank, Siva	OpticsLab	y(local)	ISS Array	23:57
23:44	ISC	Rahul	OpticsLab	y(local)	ISS Array (in 1 hour before)	23:44
00:59	PCAL	Tony	PCAL Lab	y(local)	Closing sphere apetures	01:04

LHO VE - 2025 April vent - VAC diary

janos.csizmazia@ligo.org — Thu, 03 Apr 2025 18:30:56 -0700

Author: janos.csizmazia@ligo.org

Report ID: 83738

Today's activities: - HAM1's Y+ and Y- doors have been taken off (thanks to Tyler, Randy for the help in the door removal, and to Tony and Corey for breaking the bolts earlier) - All 5 HAM1/HAM2 viewport covers have been installed - The 16.5" flange was taken off from the top of HAM1 - this will be the basis of the new vacuum interlock gauge - A high number of leak checking was done, in detail: - Y-manifold: Y+ X+ side flanges (3 pcs.); Turbo flange (1 pc.) - BSC8: Y+ X+ corner (3 pcs.); Y- X+ corner (3 pcs.); X+ HEPI bellows (2 pcs.); X+ collar 16.5" flanges (2 pcs.) - BSC8-BSC1 spool: Y+ X+ flanges (3 pcs.) - BSC1: Y+ X+ side flanges (3 pcs.); X+ collar flanges (2 pcs.); X+ HEPI bellows (2 pcs.); X+ door flanges (5 pcs.); Y- X+ side flanges (3 pcs.) - BSC2: Y+ X+ side flanges (3 pcs.) - BSC3: Y+ HEPI bellows (2 pcs.); Y+ X- side flanges (3 pcs.); Y+ collar flanges (2 pcs.); Y+ door flanges (5 pcs.); Y+ X+ side flanges (3 pcs.) - HAM2-HAM3 spool: vent port (1 pc.); X- flanges (11 pcs.); Y- side flanges (2 pcs.); X+ Y- flanges (5 pcs.) - HAM3: Y- door flanges (5 pcs.)

LHO General - Water Leak

tyler.guidry@ligo.org — Thu, 03 Apr 2025 16:38:57 -0700

Author: tyler.guidry@ligo.org

Report ID: 83737

Beginning early last week water usage, specifically what is delivered to the buildings following treatment, spiked. Not only was our consumption far outside of our normal usage during operating hours, but it was significantly higher than we would expect in off hours/weekends. After tracking burn rates, I calculated an average continuous flow of ~1.25gpm. With the help of the operator core and Richard, Facilities began the process of trying to determine the source of the lost water. This usually means site walks both inside and out looking for running water/stuck valves/wet areas. Persistent rain was no help in determining a potential source outside and there was no apparent continuous/suspect flow inside. Given that, we began the process of elimination by isolating water supply to individual buildings. We began with the staging and VPW which share a shutoff valve but to no avail. The same was done at the LSB and LExC yielding the same result. Head scratching continued and I eventually stumbled upon a small wet area of asphalt just outside the Carpenter Shop near the potable water holding tank. It was not immediately clear to me that this would be the source of the leak since the rain was still intermittent and the presence of water was pretty unsuspecting given what we have likely put in the ground in that area. So, I snapped a photo and kept an eye on this area in the coming days. Each day that went by the spot did not dry and actually grew larger. At this point it is clear that the water leak is beneath the asphalt and judging by the as-built drawings is probably a failed 45 deg joint. Beginning early next week the asphalt will be removed and the surrounding area will be vacuumed out as opposed to dug so as not to have to interrupt the supply of high volts to the chillers etc. Once the failed area is identified potable supply will have to be cut off to the entire site while repairs take place. E. Otterman R. McCarthy C. Soike T. Sanchez T. Guidry

Images attached to this report

H1 SYS - Progress of Vent work this week

betsy.weaver@ligo.org — Thu, 03 Apr 2025 16:22:20 -0700

Author: betsy.weaver@ligo.org

Report ID: 83736

Images attached to this report

H1 AOS - HEPI Upgrade Preparation

filiberto.clara@ligo.org — Thu, 03 Apr 2025 15:48:55 -0700

Author: filiberto.clara@ligo.org

Report ID: 83735

WP 12408
ECR E2200043

Beckhoff electronics for the HEPI Controller Upgrade are now installed in the MER. Power and network cables were pulled from the Mechanical Room vacuum rack. Power to the electronics is on the vacuum UPS. Field cables to BSC2 are now terminated. Modifications to the motor control panel are still required. They will be done concurrently with the software updates as HEPI needs to be taken offline. Date for upgrade TBD.

Images attached to this report

H1 PEM - BSC8 dust monitor

ryan.crouch@ligo.org — Thu, 03 Apr 2025 15:40:34 -0700

Author: ryan.crouch@ligo.org

Report ID: 83734

I noticed that the 500nm counts were stuck so I restarted the dust monitor (didn't fix the stuck value), and restarted the IOC but it didn't come back after the restart, the dust monitor isn't writing 2 values correctly it seems? I might have to swap this to another dust monitor, I don't have any more spare pumped dust monitors so I think I would want to take one of the 2 currently in stagings' ground floor if possible. I also double checked that all the settings on the actual device were the same as the others. The 0.3 RAW counts seem to be still working confusingly.

The reported error is as follows

2025/04/03 15:16:59.169508 gt521s1 H1:PEM-CS_DUST_LVEA10_300NM_RAW_IN: Input " , ,010,060,000..." does not match format "%*[-0-9]*[:0-9]*ff*f*f*f"

H1 CDS - HAM1 ASC RELF WFS Cabling

filiberto.clara@ligo.org — Thu, 03 Apr 2025 15:25:38 -0700

Author: filiberto.clara@ligo.org

Report ID: 83732

WP 12438
Rack Layout D1001425

RF cables for ASC REFL WFS were pulled to HAM1 flange D6. Cables need to be dressed into the ISC-R2 rack. Some electronics in ISC-R2 were moved to make room for a delay line and 2-Ch Demodulator. Delay line chassis is installed. Demodulator chassis is being assembled at CIT. Existing coaxial cables need to be tested for delay phase before being pulled out and re-terminated. At this time some patch panel work in ISC-R2 will also be done.

F. Clara, M. Pirello, T. Sanchez, D. Sigg

ISC

H1 SEI - HAM1 ISI refit mostly done, will switch containers next week

jim.warner@ligo.org — Thu, 03 Apr 2025 14:25:22 -0700

Author: jim.warner@ligo.org

Report ID: 83730

FInished updating the sensors for HAM1 ISI in the staging building. New CPS seem to be alive and noise is within spec, considering the state the ISI is in (on storage container base and locked). TMDs and vertical L4Cs will be added in chamber. We will swap to the narrower transport base next week in prep for moving to OSB. I will post asds for cps soon, screenshot isn't working on this laptop.

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Thu, 03 Apr 2025 14:12:28 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83729

TITLE: 04/03 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in PLANNED ENGINEERING for VENT

Extremely productive day in which the following tasks were completed:

KIM - Stock garb room by HAM3 - DONE
KIM/NELLIE - 2nd HAM1 Cleaning - DONE
RANDY - Move forklift to HAM1 South bay area - DONE
RANDY - Ameristat HAM1 HEPI grout areas - DONE
5 PEOPLE - Move HAM1 cleanroom into final place - DONE
VAC/FAC - HAM1 Doors off at +Y tp HAM3 CR, -Y crane to High Bay Area - DONE
GERARDO/TRAVIS - Install Septum VP covers in HAM1
EE - POP Cabling - DONE
VAC - HAM1 Remove 16" Top Flange forklift down for work
VAC - HAM1 Top flange Guage work table side - GM?
VAC - Checklist for corner vent
VAC - Leak check Corner under vac

Attached is a photo of the most recent SUS/SEI guardian configurations.

Oli is taking over the shift for the remaining 2 hours.

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:38	FAC	Randy	LVEA	N	Laying down ameristat HEPI grout areas	16:19
14:49	FAC	Chris	LVEA	N	Giving Randy tape at HAM1	17:30
14:49	FAC	Kim	LVEA	N	Technical cleaning	17:32
14:49	FAC	Nellie	LVEA	N	Technical Cleaning	16:37
14:51	FAC	Tyler	LVEA	N	Forklift moving	14:52
15:15	VAC	Jordan	LVEA	N	Pump check	15:22
15:54	FAC	Jordan	LVEA	N	Continue leak checking	19:06
16:15	VAC	Travis	LVEA	N	Leak Checks	19:21
16:16	ISC	Sivananda	Optics Lab	Local	ISS Array work	19:03
16:16	ISC	Mayank	Optics Lab	Local	ISS Array Work	19:03
16:17	AOS	TJ	LVEA	N	Corner station dust monito	16:43
16:19	FAC	Tyler, Tony	LVEA	N	Moving cleanroom	17:30
16:38	SEI	Fil	LVEA	N	HAM1 Cable Work	17:55
16:44	EE	Marc	LVEA	N	HAM1 Cable Work	18:00
16:55	PEM	TJ	LVEA	N	Checking dust monitor	17:31
17:05	AOS	Betsy	LVEA	N	Walkabout	17:29
17:12	ISC	Rahul	Optics Lab	Local	ISS Array Work	19:03
17:15	FAC	Tyler	LVEA	N	Taking HAM1 -Y Door Off	19:21
17:27	FAC	Richard	LVEA	N	Walkabout	17:29
17:27	ISC	Jennie	Optics Lab	Local	ISS Array Work	19:03
18:06	AOS	Ibrahim	LVEA	N	Checking progress; delivering parts	18:13
18:07	CDS	Fil	LVEA/MER	N	Prep HEPI pump upgrade; terminating cables	21:15
18:29	PCAL	Tony	PCAL Lab	y(local)	PCALin'	19:23
18:40	EPO	Mike, Dutch Envoy, Betsy, Richard	LVEA	N	Walkabout	19:21
19:16	ISC	Daniel	LVEA	N	Looking at racks	20:05
19:58	EE	Fil	LVEA	n	Electronics rack work	21:58
20:19	VAC	Travis	LVEA	N	HAM1 viewport covers	22:19
20:22	IAS	Jason, Ryan	LVEA	N	FARO Work	20:35
20:24	SUS	Mayank, Sivananda, Betsy	LVEA	N	HAM1 Work	21:24
20:41	VAC	Gerardo	LVEA	N	HAM1 Work	21:41
20:48	VAC	Janos, Jordan	LVEA	N	Leak Checks	21:48
20:50	FAC	Jackie, Richard	LVEA	N	Walkabout	20:58

Images attached to this report

H1 TCS - Starting L5L CO2 Laser setup to test QPD path for CHETA

matthewrichard.todd@ligo.org — Thu, 03 Apr 2025 13:24:16 -0700

Author: matthewrichard.todd@ligo.org

Report ID: 83728

M. Todd, C. Compton

We started setting up the Access CO2 laser in the optics lab, and after confirming that the beam coming from the aperature has not changed since previous tests, we have begun installing optics to test a setup we are imagining for CHETA.

Figure 1 is the proposed setup to test the QPD path. The ITM in this setup will really just be a screen or block, and we may do some razor-blade profiles of it. The QPD should be at the same Gouy phase as the "ITM", and this model adheres to that. So far, we have installed three of the steering mirrors and encorporated their measured distances (aligned to the optics grid) to this model, as seen in Figure 2.

Here are the beam parameters at the relevant points in the model, which may be confirmed with profiles.

q at Laser.fr.o from BeamTrace:
+-----------+-------------------------------+----------+-----------+----------+------------------+-----------------------+
| direction |             q [m]             | w [m]   | RoC [m] | w0 [m] | Accum Gouy [deg] | Dist. form source [m] |
+-----------+-------------------------------+----------+-----------+----------+------------------+-----------------------+
|     x     | -1.140000e-01 + 4.268000e-01j | 1.24e-03 | -1.71e+00 | 1.20e-03 |       0.00       |         0.000         |
|     y     | -1.140000e-01 + 4.268000e-01j | 1.24e-03 | -1.71e+00 | 1.20e-03 |       0.00       |         0.000         |
+-----------+-------------------------------+----------+-----------+----------+------------------+-----------------------+

q at QPDStop.fr.i from BeamTrace:
+-----------+-------------------------------+----------+-----------+----------+------------------+-----------------------+
| direction |             q [m]             | w [m]   | RoC [m] | w0 [m] | Accum Gouy [deg] | Dist. form source [m] |
+-----------+-------------------------------+----------+-----------+----------+------------------+-----------------------+
|     x     | -1.723144e-01 + 4.141798e-02j | 1.60e-03 | -1.82e-01 | 3.74e-04 |      237.00      |         3.273         |
|     y     | -1.720586e-01 + 4.111144e-02j | 1.60e-03 | -1.82e-01 | 3.72e-04 |      237.02      |         3.273         |
+-----------+-------------------------------+----------+-----------+----------+------------------+-----------------------+

q at ITMStop.fr.i from BeamTrace:
+-----------+------------------------------+----------+----------+----------+------------------+-----------------------+
| direction |            q [m]             | w [m]   | RoC [m] | w0 [m] | Accum Gouy [deg] | Dist. form source [m] |
+-----------+------------------------------+----------+----------+----------+------------------+-----------------------+
|     x     | 1.451712e+00 + 2.808360e-01j | 5.13e-03 | 1.51e+00 | 9.73e-04 |      237.66      |         3.699         |
|     y     | 1.453071e+00 + 2.808360e-01j | 5.13e-03 | 1.51e+00 | 9.73e-04 |      237.67      |         3.699         |
+-----------+------------------------------+----------+----------+----------+------------------+-----------------------+

Images attached to this report

H1 SEI - SEI Seismometer Mass Position Check - Monthly FAMIS 26500

ibrahim.abouelfettouh@ligo.org — Thu, 03 Apr 2025 12:49:13 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83727

Closes FAMIS 26500. Last checked in alog 83228

It is worth noting that while all ISIs were in ISI_DAMPED_HEPI_OFFLINE and I did this task during lunch with minimal LVEA activity and untripped WDs, we are in a vent so values may not be nominal. Despite this, the outputs are still comparable to last month's with the same +-1 number of out-of-range STSs/T240s.

STS Centering

Averaging Mass Centering channels for 10 [sec] ...
2025-04-03 12:42:01.264160
There are 1 STS proof masses out of range ( > 2.0 [V] )!
STS EY DOF X/U = -2.34 [V]
All other proof masses are within range ( < 2.0 [V] ):
STS A DOF X/U = -0.623 [V]
STS A DOF Y/V = -0.678 [V]
STS A DOF Z/W = -0.626 [V]
STS B DOF X/U = 0.241 [V]
STS B DOF Y/V = 0.946 [V]
STS B DOF Z/W = -0.394 [V]
STS C DOF X/U = -0.801 [V]
STS C DOF Y/V = 0.799 [V]
STS C DOF Z/W = 0.612 [V]
STS EX DOF X/U = -0.052 [V]
STS EX DOF Y/V = -0.052 [V]
STS EX DOF Z/W = 0.067 [V]
STS EY DOF Y/V = -0.077 [V]
STS EY DOF Z/W = 1.291 [V]
STS FC DOF X/U = 0.19 [V]
STS FC DOF Y/V = -1.11 [V]
STS FC DOF Z/W = 0.653 [V]
Assessment complete.

T240 Centering

Averaging Mass Centering channels for 10 [sec] ...
2025-04-03 12:44:13.270291
There are 14 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 2 DOF X/U = -1.086 [V]
ETMX T240 2 DOF Y/V = -1.059 [V]
ETMX T240 2 DOF Z/W = -0.718 [V]
ITMX T240 1 DOF X/U = -1.658 [V]
ITMX T240 1 DOF Y/V = 0.416 [V]
ITMX T240 2 DOF Z/W = 0.411 [V]
ITMX T240 3 DOF X/U = -2.126 [V]
ITMY T240 3 DOF X/U = -0.835 [V]
ITMY T240 3 DOF Z/W = -2.379 [V]
BS T240 3 DOF X/U = -0.504 [V]
BS T240 3 DOF Z/W = -0.355 [V]
HAM8 1 DOF X/U = -0.316 [V]
HAM8 1 DOF Y/V = -0.438 [V]
HAM8 1 DOF Z/W = -0.723 [V]
All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = -0.079 [V]
ETMX T240 1 DOF Y/V = -0.051 [V]
ETMX T240 1 DOF Z/W = -0.05 [V]
ETMX T240 3 DOF X/U = -0.021 [V]
ETMX T240 3 DOF Y/V = -0.154 [V]
ETMX T240 3 DOF Z/W = -0.047 [V]
ETMY T240 1 DOF X/U = 0.052 [V]
ETMY T240 1 DOF Y/V = 0.13 [V]
ETMY T240 1 DOF Z/W = 0.194 [V]
ETMY T240 2 DOF X/U = -0.098 [V]
ETMY T240 2 DOF Y/V = 0.183 [V]
ETMY T240 2 DOF Z/W = 0.062 [V]
ETMY T240 3 DOF X/U = 0.21 [V]
ETMY T240 3 DOF Y/V = 0.079 [V]
ETMY T240 3 DOF Z/W = 0.105 [V]
ITMX T240 1 DOF Z/W = 0.258 [V]
ITMX T240 2 DOF X/U = 0.204 [V]
ITMX T240 2 DOF Y/V = 0.07 [V]
ITMX T240 3 DOF Y/V = 0.293 [V]
ITMX T240 3 DOF Z/W = 0.16 [V]
ITMY T240 1 DOF X/U = 0.043 [V]
ITMY T240 1 DOF Y/V = 0.088 [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 = 0.264 [V]
ITMY T240 2 DOF Z/W = 0.087 [V]
ITMY T240 3 DOF Y/V = 0.046 [V]
BS T240 1 DOF X/U = 0.107 [V]
BS T240 1 DOF Y/V = -0.274 [V]
BS T240 1 DOF Z/W = -0.208 [V]
BS T240 2 DOF X/U = 0.046 [V]
BS T240 2 DOF Y/V = -0.294 [V]
BS T240 2 DOF Z/W = 0.174 [V]
BS T240 3 DOF Y/V = -0.044 [V]
Assessment complete.

SEI

H1 TCS - TCS Chiller Water Level Top Off - FAMIS 27812

ibrahim.abouelfettouh@ligo.org — Thu, 03 Apr 2025 12:36:07 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83726

Closes FAMIS 27812. Last checked in alog 83486

CO2Y:

Before: 10.4ml

After: 10.4ml

Water Added: 0ml

CO2X:

Before: 30.1ml

After: 30.1ml

Water Added: 0ml

No water leaking in our leak detection system (aka dixie cup)

TCS

H1 PEM - Comment to CS Dust Monitor Vacuum Pump Swapped with Spare

thomas.shaffer@ligo.org — Thu, 03 Apr 2025 11:52:27 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83725

Richard and I removed the old burnt foam and added some new rubber for the pump feet to sit on. You could still feel the vibration of the pump on the table, but it seemed to be damped well.

Images attached to this report

H1 SUS - FYI - new models and screens in userapps/sus/

brian.lantz@ligo.org — Thu, 03 Apr 2025 11:52:13 -0700

Author: brian.lantz@ligo.org

Report ID: 83724

TL;DR - Don't worry about the new models and screens in /userapps/trunk/sus - Brian is developing these for the OSEM estimator project and none of these are (currently) linked to any observatory model.

FYI - As part of the project to see if we can improve the noise caused by the OSEMs, we are developing new models and medm screens for the HLTS. Tracking for this ECR is in FRS ticket 32526.

We are running these at Stanford for testing, and putting them into userapps because we will be trying them on a triple at LHO soon (detail will be in a different log, they are still in flux a bit).

As such, I've created several new things in userapps. These are not linked to anything at either site - I'm putting this note here to reduce potential worry. These are still in development, so I suggest waiting a bit before you look at these.

New Files:

/userapps/trunk/sus/common/models/
HLTS_MASTER_W_EST.mdl - library part for M1 with the estimator calculation
SIXOSEM_T_STAGE_MASTER_W_EST.mdl - library part for upgraded HLTS model with the estimator included.

userapps/trunk/sus/common/medm/hxts/
SUS_CUST_HLTS_OVERVIEW_W_EST.adl - new overview screen with estimator

These files are copies of the existing parts as of March 2025, and I added _W_EST to the name of the copy.

userapps/trunk/sus/common/medm/estim/ - directory of new sub-screeens for the estimator

Updated files:

userapps/trunk/isi/common/models/
blend_switch_library.mdl - I added a new model to this library to allow smooth switching between the osem damping, the estimator damping, and OFF.

I'm running this from the new top-level model in

/userapps/trunk/isi/s1/s1suspr3.mdl

SEI

LHO FMCS - Checking HVAC Fans - Weekly FAMIS 26371

ibrahim.abouelfettouh@ligo.org — Thu, 03 Apr 2025 10:43:12 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83723

Closes FAMIS 26371. Last checked in alog 83630,

Everything is under threshold. H0:VAC-MX fans had a sudden increase in noise character and signal 6 days ago.

PEM

Images attached to this report

H1 PSL - PSL Weekly Report - Weekly FAMIS 26382

ibrahim.abouelfettouh@ligo.org — Thu, 03 Apr 2025 10:33:02 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83721

Closes FAMIS 26832, last checked in alog 83610

Laser Status:
    NPRO output power is 1.829W
    AMP1 output power is 70.43W
    AMP2 output power is 141.1W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 1 days, 20 hr 16 minutes
    Reflected power = 22.99W
    Transmitted power = 105.7W
    PowerSum = 128.7W

FSS:
It has been locked for 0 days 20 hr and 13 min
TPD[V] = 0.8222V

ISS:
The diffracted power is around 4.1%
Last saturation event was 1 days 20 hours and 15 minutes ago

Possible Issues: None reported

PSL

LHO VE - Thu CP1 Fill

david.barker@ligo.org — Thu, 03 Apr 2025 10:30:09 -0700

Author: david.barker@ligo.org

Report ID: 83719

Thu Apr 03 10:05:16 2025 INFO: Fill completed in 5min 13secs

Images attached to this report

H1 PEM - CS Dust Monitor Vacuum Pump Swapped with Spare

thomas.shaffer@ligo.org — Thu, 03 Apr 2025 10:29:27 -0700

Author: thomas.shaffer@ligo.org

Report ID: 83716

Yesteerday I noticed that the CS pump could only pull 18inHg (nominal 19) even with the bleed valve closed. There was lots of carbon dust around the exhaust and the filter tumb screws were tight, all signs that it was time for a rebuild. Today, Ryan C and I swapped it with the spare, which fired right up and pulled to well above 20inHg before I adjusted the bleed valve and brought it back to 19.

Two safety notes:

The out plastic on the spade connectors look like they have been damaged from recent swaps (attachment 1). Since we have to feed these through a 90deg elbow and then fish them out of the housing before pluging them in, I'm not surprised that it could have been damaged. We will talk with Fil or similar to find a better solution.
These pumps get very hot, >130F at times, and the foam it sits on to damp it has started to melt and burn (attachment 2). I'll find a new material for it to sit on and update.

OpsInfo

Images attached to this report

H1 SEI - H1 ISI CPS Sensor Noise Spectra Check - Weekly FAMIS 26037

ibrahim.abouelfettouh@ligo.org — Thu, 03 Apr 2025 10:25:17 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83718

Closes FAMIS 26037. Last checked in alog 83671.

Expectedly, all plots have elevated signals. This is because we are venting in the LVEA and sensor correction is not in the nominal state. PDF Attached

SEI

Non-image files attached to this report

CPS_spectra_10:21-04_03_2025.pdf

H1 PEM - Comment to BSC8 Dust monitor

ryan.crouch@ligo.org — Thu, 03 Apr 2025 09:46:52 -0700

Author: ryan.crouch@ligo.org

Report ID: 83715

Trending DM10 dust monitors overnight.

Images attached to this report

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Thu, 03 Apr 2025 07:42:29 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83714

TITLE: 04/03 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 5.75 μm/s
    Secondary useism: 1.85 μm/s
QUICK SUMMARY:

IFO is in PLANNED ENGINEERING for the VENT

Today's planned activities:

Kim/Nellie - 2nd Cleaning HAM1
Randy - Trailer in ISI middle gantry and crane over for fit check at HAM1 +Y
Randy - Crane out 3IFO Flange Crate
Randy - Ameristat HAM1 HEPI grout areas
5 People - Move HAM1 cleanroom into final place
VAC - Checklist for corner vent
VAC - Leak check corner under vent
HAM1 +Y Door Removal
VAC - HAM1 Remove 16" Top Flange forklift down for work
VAC - HAM1 Top Flange guague work table side

Work safe!

LHO VE - 2025 April vent - VAC diary

janos.csizmazia@ligo.org — Wed, 02 Apr 2025 18:15:11 -0700

Author: janos.csizmazia@ligo.org

Report ID: 83713

Today's activities: - HAM1 was vented, the bolts of both the Y+ and Y- doors have been taken off (besides 4 bolts/door, see aLog 83704), in preparation for removing one of the doors tomorrow - After the installation of a faulty gauge on HAM6, today it was replaced with a functional one (same type), leak checked, and found OK. No further pumping on this gauge, it will be valved together with the corner during the pumpdown - Some leak checking was done, in detail: - BSC8: Y- X- side flanges (3 pcs.) - BSC2: Y+ X- side flanges (3 pcs.) - HAM4: X- door flanges (5 pcs.) - HAM5: X- door flanges (5 pcs.); top flanges - and adjacent sub-flanges (3 pcs.); X+ door flanges (5 pcs.) - HAM6: X- door flanges (5 pcs.); top flanges - and adjacent sub-flanges (2 pcs. - the turbo will be replaced later, so no leak check there); Y- door flanges (3 pcs.); X+ door flanges (5 pcs.) - HAM4-HAM5 spool piece: Y- side X- and top flanges (6 pcs.); top flanges (4 pcs.); Y+ side X- and bottom flanges (4 pcs.); vent valve (1 pc.); IP3 and IP4 flanges (2 pcs.). This spool piece is now complete, as other flanges have been leak-tight verified earlier according to aLog 45415

H1 CDS - HAM1 Tip Tilts - PMI/RM1/RM2

filiberto.clara@ligo.org — Wed, 02 Apr 2025 17:12:53 -0700

Author: filiberto.clara@ligo.org

Report ID: 83712

WP 12424

List of work for PMI and RMI1/2:

1. Both Sat Amplifier Chassis now installed in SUS-R1
2. Cables for RM1/2 have been terminated
3. Cables for PM1 pulled from SUS-C4 to SUS-R1
4. Cabling from Amplifier chassis for PMI/RM1/RM2 pulled to HAM1 Flange D6

Coil drivers need to be relocated in CER to lastest D0902810 drawing.

F. Clara, M. Pirello

SUS

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Wed, 02 Apr 2025 16:47:38 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83709

TITLE: 04/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Extremely productive day in which we finished most of our activities, listed below:

Crane engine hoist to BSC8 (FAC) - DONE
Inspect HAM1 and BSC8 final cleanroom (FAC) - DONE
Turn on HAM1 cleanroom and garb room (FAC) - DONE
Power down ISC chassis that will be recabled (Fil/EE) - DONE
Pull ISC cables - NOT COAX yet and work to relabel (Fil/EE) - DONE
HAM1 Offload HEPI Setup (SEI/Jim/Mitchell)
Leak check corner under vac (VAC)
Prep for corner vent (VAC)
Checklist for HAM1 vent (VAC) - DONE
HAM1 1st cleaning (Kim/Nellie/FAC) - DONE
Clean out recieving for ISI (FAC) - DONE
HAM6 Guage Work (VAC) - DONE
Checklist for corner vent (VAC)
Move forklift to HAM1 south bay area (FAC)
Crane or move power bang box to southbay for cleanrooms (FAC) - DONE
Replace ~3ft of cleanroom panel for HAM2 +Y-X (FAC) - DONE
Vent HAM1 (VAC) - DONE
Start HAM1 bolt/door removal (VAC/Randy/Tony/Corey) - DONE - alog 83704
Move HAM1 cleanroom into final place (5 people)
Stock garb room by HAM3 (FAC/Kim)
Prep laydown areas for stack deinstall, setup door pallet at HAM3+Y - DONE
Get dust mons working and trending (OPS/RyanC) - DONE - alog 83706, alog 83694

Relevant alogs pertaining to today:

HEPI/ISI Pointing after locking: alog 83705
Sush7 timing glitch model restart: alog 83698
High Voltage Shutoff Prep: alog 83695

Attached is a picture of our SEI/SUS Guardian configurations

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:47	FAC	Kim	Optics Lab	N	Technical Cleaning	15:05
15:04	FAC	Tyler	LVEA	N	Engine hoist	15:23
15:48	AOS	Ryan S, TJ	LVEA	N	Moving ISC Tables	15:56
15:48	EE	Fil	LVEA	N	Cable work contd.	16:48
15:51	VAC	Gerardo	LVEA	N	Purge air measurement	19:06
15:54	AOS	Betsy	LVEA	N	Walkabout	16:33
15:56	VAC	Jordan, Janos	LVEA	N	Leak checks	19:16
15:59	FAC	Nellie, Kim	LVEA	N	Technical cleaning	19:33
16:07	FAC	Chris	LVEA	N	FAMIS tasks	17:24
16:13	SEI	Jim	LVEA	N	Move L4Cs	19:58
16:20	AOS	TJ, Camilla	Optics Lab	N	Part search	17:00
16:33	FAC	Richard	LVEA	N	Looking for trip hazards	16:54
17:26	ISC	Jennie, Rahul, Mayank, Siva	Optics Lab	Local	ISS Array Work	19:33
18:13	FAC	Richard	LVEA	N	Walkabout	18:23
18:38	EE	Marc	LVEA	N	Cable work	23:45
19:51	FAC	Richard	LVEA	N	Walkabout	19:57
19:56	ISC	Siva, Mayank	Optics Lab	Local	ISS Array Work	21:36
20:07	OPS	Ryan C	LVEA	N	Dust monitor cable tracing	21:20
20:10	FAC	Tony, Corey	LVEA	N	HAM1 Bolt Removal	21:52
20:40	VAC	Jordan	LVEA	N	Leak Check	00:38
20:40	VAC	Janos	LVEA	N	Leak Check	00:38
20:41	VAC	Travis, Gerardo	LVEA	N	HAM6 Gauge Replacement	22:28
20:41	AOS	Ryan C	FCES	N	Dust monitor cable retrieval	21:04
20:58	ISC	Rahul	Optics Lab	Local	ISS Array Work	21:36
21:03	FAC	Tyler, Richard	LVEA	N	I-Beam	22:02
21:30	EE	Fil	LVEA	N	HAM1 cable work	23:30
23:21	VAC	Gerardo	LVEA	NN	Lockout GV1	00:21

Images attached to this report

H1 AOS - FARO LVEA Setup and Alignment (WP 11757)

jason.oberling@ligo.org — Wed, 02 Apr 2025 16:34:06 -0700

Author: jason.oberling@ligo.org

Report ID: 83685

R. Crouch, J. Oberling, M. Robinson, T. Guidry, T. O'Hanlon

Incoming wall of text, but here's the short, short version: Over the past ~15 months during available Tuesday maintenance windows we have been working the FARO around the LVEA, setting alignment nests so we have the ability to drop the FARO almost anywhere in the LVEA and have it aligned to the local LVEA coordinate system. I'm happy to report that, after working through and around unavoidable delays (mostly the emergency vent for OFI repair and the PSL frequency noise issues from the latter half of 2024, as well as several maintenance periods where IAS personnel were unavailable due to other required maintenance work) this effort is finally complete. There are now 53 bright red Spherically-Mounted Retroflector (SMR) nests around the LVEA, and a number around the frame of the high-bay rollup door and the nearby wall; these nests have been aligned to the LVEA local coordinate system. The naming scheme is F-CSXXX: F for FARO, CS for the building (Corner Station in this case), and XXX is the monument number.

As a brief reminder of where things were left before we started moving the FARO around the LVEA, we had found what appeared to be a good alignment to our West Bay alignment monuments (BTVE-1, PSI-1, PSI-2, PSI-6, and height marks 901, 902, and 903 (for z-axis alignment only)). We had found multiple errors in z-axis coordinates for the 4 alignment monuments, eventually having to perform a water tube level survey of the BSC2 door flanges to re-establish our Z=0, then propagate that measurement to our alignment monuments to establish accurate z-axis coordinates w.r.t. WBSC2. Alogs from that work for some "light" reading: 75669, 75771, 75974, 76889, and 77216.

Jumping the X-arm Beam Tube

Our main challenge with this effort was moving the FARO to the other side of the X-arm beam tube (BT). Our most readily-accesible alignment monuments for the FARO are all in the West Bay, with no access back to these monuments once we had moved to the outside of the BT; this simple fact makes an accurate device move for the FARO very difficult (a device move is most accurate when we can shoot a mixture of nests at the new position and at the previous position(s) ). We had set several nests along the wall near the X-arm BT to assist in making the move, as well as using existing nests along the frame of the High-Bay rollup door, but still our position errors for the device move were >0.5 mm. TJ O'Hanlon was visiting in June 2024 and we brainstormed several methods to tighten up this positional uncertainty. Ultimately we decided to place temporary nests on the BTs themselves to aid in the initial and final device moves (temporary because as soon as we vent the nests move with the vacuum system, and don't necessarily return to the same spot once the vertex is back under vacuum). We set 4 nests along the top of the X-arm BT, 6 nests along the top of the Y-arm BT, and a single lonely nest on the bottom of the Y-arm BT; the Y-arm BT nests we to allow us to close the circle once we moved from the input arm area back into the West Bay. At this point we were interrupted for some PSL work (PMC swap, early July), the vertex vent for the OFI repair (July - August), and then the PSL frequency noise issues (late-September to December). We were finally able to restart this effort in mid-December 2024 and test our "new" method for jumping the BT. And it worked! Our first positional uncertainty was <0.1 mm, so we began setting alignment nests and moving the FARO around the LVEA.

Moving Around the LVEA

We started in the High-Bay area, setting nests as needed and moving to the next position to set more nests, then moving to the next position to set more... You get the idea. Our route took us around the outside of the LVEA. Starting in the High-Bay area, we proceeded down the +X side of the output arm (WHAM 5/6) and back up the -X side towards WHAM3; then down the -Y side of the input arm, around the PSL enclosure, and then back up the +Y side; and finally back in the West Bay to tie back into our original nests and apply the alignment to the LVEA local coordinate system. The issue here is the FARO really likes a large volume for accurate device moves, and this is something we definitely do not have along the outside edge of the LVEA (this is also where most IAS work takes place). We are essentially moving down a series of hallways, the hallways being the narrow walking areas between the vacuum chambers and the LVEA walls. These narrow corridors restrict the volume we can use for setting nests, which means device position errors begin stacking up as we continue to move around the LVEA. In addition, due to the vacuum equipment restricting line of sight we quickly lose sight of nests at previous device positions, which in turn causes position errors to begin stacking up; for most of our trip around the LVEA we only had sight to the device position immediately preceding the current one, and nothing further back. This is, unfortunately, unavoidable due to the physical layout of the LVEA. In an ideal world we would be able to do all of this with an empty LVEA, but that's not possible so we deal with what we have.

PolyWorks can estimate the device position error, so the 1st attached picture shows the results after we completed our circuit around the LVEA and tied back into our initial monuments in the West Bay. Ignore the Pass/Fail under the Test column, I didn't change PolyWorks' default of 0.25 mm and we don't really have a metric for this right now, the important thing here is the value in the Uncertainty column. PolyWorks uses a Monte Carlo simulation to calculate device position uncertainty, defaults to 100 simulations per device position; these results are given as 2 standard deviations (PolyWorks default) for each position from the instrument origin. This means that ~95% of the device's calculated positions from the simulations are within the listed uncertainty. Position 1 is our starting point by WBSC4 (old H2 BS chamber), with a view of our temporary nests on the X and Y BT, as well as the nests on the wall across the X BT and the High-Bay rollup door frame; position 2 is our jump over the X-arm BT; positions 3 through 6 are down the output arm and back up the other side to WHAM3; positions 7 through 10 are down the input arm, around the PSL enclosure, and back up the +Y side; position 11 is the final position we used before moving back into the West Bay, near the TCSy table (with a view of the monuments we placed on the Y-arm BT); position 12 is back in the West Bay close to the biergarten, and positions 13 and 14 are near the mechanical test stand by the West wall of the LVEA (14 is a repeat of 13 to account for device drift after sitting overnight). As can be seen, the estimated positional uncertainty grows as we move down the "hallways" of the output and input arms, with the worst uncertainty at the positions furthest from our starting point (positions 7-10, around the input arm). At this time I'm not sure we can do much better, given the constraints of the physical layout of the LVEA; we spoke with LLO at the last IAS meeting and they reported seeing similar numbers in their LVEA circuit. With the LVEA circuit complete, we moved back into the West Bay to grab the last nests there that couldn't see from our initial position and to align to the LVEA local coordinate system.

Aligning to the LVEA Local Coordinate System

Back in the West Bay we collected the last of the red nests for FARO alignment and our alignment monuments (BTVE-1, PSI-1, PSI-2, PSI-6, and height marks 901, 902, and 903). We used the 5" sphere fit rod to grab BTVE-1 and the PSI monuments. We replaced the magnetic nests we had been using for the 3 height marks with glue nests, and glued them down. Using an autolevel and a scale we measured the difference between where the nest ended up and where the height marks were (since the glue sets fast we couldn't sight the nests in directly inline with the height marks):

Nest z-axis position w.r.t. height mark
- 901: +0.5 mm
- 902: -1.7 mm
- 903: -0.5 mm

As done back in April 2024 (alog 77216), we used the z-axis coordinate for the BTVE and PSI monuments that had been corrected for the depth of the punch in the monument (since the sphere fit rod measures to the point at the base of the rod, which sits in the punch, and not the monument surface) and that had been corrected by our water tube level survey of WBSC2. We used BTVE and the 3 PSI monuments to get a rough X,Y,Z alignment (again, not using PSI-6 for z-axis alignment since we do not trust its z-axis coordinate). This rough alignment was then used to capture X and Y coordinates for the nests at the height marks, then the height marks were used to enhance the z-axis alignment (not used for X and Y). The results of this alignment are shown in the 2nd attached picture; for ease of comparison I've included the alignment results from April 2024, see the 3rd attached picture. This alignment is similar to the one we had back in April 2024, with a couple of differences that at first glance look large. The X and Y coordinates for height marks 901, 902, and 903 deviate by large amounts compared to what we had measured with our rough, BTVE/PSI only alignment, which was not the case in our April 2024 alignment. But if you look closely, you see that the measured components for the height marks in both alignments (March 2025 and April 2024) are very similar; this is what is important. We don't really care about the X and Y coordinates for the 3 height marks as we aren't using them in the alignment, and they were only captured using a rough alignment to begin with. The fact the measured components are matching fairly well lends some confidence to this alignment. The difference between the 2 that has the most potential impact is in the measured z-axis coordinates of the BTVE/PSI monuments. These z-axis coordinates are all roughly a factor of 2 worse in the March 2025 alignment vs the April 2024 one. In addition, the alignment statistics on the left side of the screenshot are all better in the April 2024 alignment. The only explanation I have for this is in April 2024 we were working in the West Bay and only the West Bay, while here and now we moved the tracker all over the LVEA, thereby carrying around some positional error in the device that wasn't present in the April 2024 alignment. The only way to really test this alignment is to measure some monuments/features in the LVEA with known coordinates and see how they match. The upcoming pre-deinstall FARO shots to the WHAM1 passive stack will be a good test of this alignment. Another good monument to look at would be BTVE-5, over by the X-arm termination slab (by the cryopump/OpLev area).

As another test, since we haven't exactly trusted the repeatability of the sphere fit rod in the past, we tried using points for PSI-1 and PSI-2 and applying the alignment using those; we still had to use the sphere fit rod on BTVE-1 due to its dome shape and on PSI-6 due to it sitting inside an electronics rack in the biergarten (the bottom rail of the rack blocks direct line of sight to the monument, but the 5" sphere fit rod clears the top of it). The results of this are shown in the 4th attached picture. Right away it's clear this alignment is not as good as the one shown in the 2nd picture. The statistics are all worse, and the match between measured coordinates is worse as well. This one gets discarded and we move ahead with the previous alignment using sphere fit rods for the BTVE/PSI monuments. Next we tested importing our move device targets into a blank PolyWorks file and aligning to them.

Global Target Test

PolyWorks allows you to import global targets from a text file. In PolyWorks, a global target is one whose position is precisely known and does not change. Now that we've applied our alignment to our list of device position targets we have [X,Y,Z] coordinates in the LVEA local coordinate system for all of them. These coordinates can be exported into an Excel spreadsheet and formatted into a text file for import into a future PolyWorks project. We did a test of this, using a duplicate of our working PolyWorks project to keep from accidentally modifying our working project file. The format for the text file is 4 columns: X position, Y position, Z position, monument name. The file can have no headers (PolyWorks gets mad if there are headers), and the units must be consistent (we use mm). When importing the text file you have to specify the units used on the Import Global Target window (again, we use mm). Once the targets have been imported into the new PolyWorks project, you set the tracker somewhere in the workspace with a good view of global target nests and measure them. The tracker then automatically aligns to the coordinates of the global targets, thereby automatically aligning itself to the LVEA local coordinate system. We did this using a blank project, and the results are shown in the 5th attached picture. For the height marks we used the same nominal coordinates from the alignment (2nd picture again). This is why they look so far off at first glance, but if you compare the measured coordinates they match really good. For the PSI monuments we used a different toolilng to take those measurements. Instead of the sphere fit rod we used our Hubbs Center Punch Nest (CPN). This nest has a 2" vertical offset (the center of the SMR sits 2" above the bottom of the nest) and a built-in center punch for either making punch marks in monuments or accurately setting the nest in an existing punch mark. Because of this we had to remove the z-axis correction for the punch depth we needed for the sphere fit rod, as the Hubbs CPN measures to the monument surface not the bottom of the punch. These also look really good, with the exception of the measured z-axis coordinate for PSI-2. At this time I don't really have an explanation for this discrepancy.

We also used these test coordinates to take some preliminary shots of the 2 accessible -X WHAM1 support tube ends; details of that in a future alog (this one is long enough already).

While pulling screenshots off of the FARO laptop for this alog I also exported the device position targets from our main working file, as these are the global targets we are going to use going forward (FARO_CS_LVEA_Global_Targets_v1.xlsx). Between the main working file and the test file used to generate the global target list for the test in the two immediately preceding paragraphs, the only difference is a new device position in the main file, position 14; position 14 was necessary in the main working file as the FARO was sitting in the same spot for a week between maintenance windows (March 18 to March 25) and had therefore drifted in that timeframe (the FARO and tripod stand are heavy and slowly sink into the vinyl floor of the LVEA). The fix for this is to do a Move Device action without actually moving the device, which accounts for any drift from the previous position. The starting, unaligned coordinates of the red nests (which we turn into global targets) are the same, the alignment results are the same; again the only difference is that new position 14 in the main working file. While removing the BT nests from the target list (since we are not going to use these for placing the FARO) I noticed that the coordinates looked a little different than I remembered. So I threw together a quick and dirty comparison spreadsheet to calculate the differences (Global_Target_Coordinate_Differences.xlsx). The first 4 columns of data are from the main working file, the next r columns of data are from the test file, and the final 3 columns are the difference (test - main). Sure enough, the coordinates from the main file differ from the test file. I set conditional formatting to turn red for any differences outside of +/-0.1 mm. The largest differences are all in z-axis coordinates, and the largest of these are all nests placed along the input arm of the IFO (WHAM1/2/3) where are device position uncertainties are the largest. These are small differences, the largest being on the order of 0.25 mm, spread out over 10s of meters of LVEA space, so I don't think this is a big issue, but interesting to note nonetheless.

And that's it! I'll write another alog detailing the preliminary shots of the WHAM1 -X support tube ends. The FARO is ready to go for the upcoming pre-deinstall shots of the WHAM1 passive stack (currently slated for Monday on the Trello). This finally closes LHO WP 11757.

Images attached to this report

Non-image files attached to this report

FARO_CS_LVEA_Global_Targets_v1.xlsx

Global_Target_Coordinate_Differences.xlsx

H1 SEI - Comment to Looking at SEI HEPI/ISI Pointing after Locking

ibrahim.abouelfettouh@ligo.org — Wed, 02 Apr 2025 16:14:40 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83708

Same comparisons are below for HAM1, HAM2, HAM3 for before and after HEPI Locking

HAM1:

L4Cs: Just got noiser since Jim moved them. I don't think this can be used as a comparison for alignment but screenshotted below nonetheless.

HEPI: Largest change is in Z with 11.2um

HAM1 plots also show another change about 4/5 hours ago, which is the HAM1 vent

HAM2:

ISI: Largest change is in RZ with 22.3urad

HEPI: Largest change is in HP by 10.9um

HAM3:

ISI: Largest change is in RZ with 23.4urad

HEPI: Largest changes are Y by 10.3um and VP by 13.8um

SEI

Images attached to this report

H1 ISC - PR Gain, Circulating Power, chamber tempurature and RH settings over last 6 months

camilla.compton@ligo.org — Wed, 02 Apr 2025 16:04:35 -0700

Author: camilla.compton@ligo.org

Report ID: 83707

Matt, Camilla

While looking into a reason that we needed to continually increase EY RH over the last 6 months to avoid PIs, we've attached some trends.

In the past ~6 months there there was a 2% decrease in circulating power corresponding with a kappa_c decrease, Sheila and Dana found the same in 2023 75193. Plot here. Sheila and Dana thought this was as the OMC throughput has degraded since installation but we haven't re-checked that the balance of the two OMC DCPDs.

There is two distinct changes in PRG over the last 6 months: 10th Dec 2024 and 1st Feb 2025, I initially though they were conveniently a week or so before the EY RH increase, however they are when IM4 trans was centered 81735 / re-calibrated 82260 which probably cannot cause a physical change.

Interestingly the OM2 temperature is an interesting measure of the in change in temperature and that does change over the last 6 months, it's not clearly correlated with the circulating power change. Bottom trend of attached plot.

CAL

Images attached to this report

H1 SEI - Looking at SEI HEPI/ISI Pointing after Locking

camilla.compton@ligo.org — Wed, 02 Apr 2025 15:22:37 -0700

Author: camilla.compton@ligo.org

Report ID: 83705

Ibrahim, Ryan S, Betsy, Sheila, Camilla

Getting a baseline for how much the HAM chambers have moved since they were locked.

HAM4
- HEPI RX,RY,RZ changed by 5urad, 6urad, 0.2urad
- ISI RX,RY,RZ changed by 5urad, 1urad, 26urad
HAM5
- HEPI RX,RY,RZ changed by 4urad, 0.3urad, 0.7urad
- ISI RX,RY,RZ changed by 7urad, 3urad, 45urad
HAM6
- HEPI RX,RY,RZ changed by 18urad, 2urad, 6urad
- ISI RX,RY,RZ changed by 6urad, 3urad, 30urad

Highlighted the highest changes but none of these look particularly large.

HAM5 and HAM6 tripped just at the end of these trends too, not included in differences above, maybe a WD trip when a SEI is locked doesn't matter anyway.

Images attached to this report

H1 PEM - BSC8 Dust monitor

ryan.crouch@ligo.org — Wed, 02 Apr 2025 15:17:40 -0700

Author: ryan.crouch@ligo.org

Report ID: 83706

I set up an internally pumped dust monitor, that I borrowed from the FCES (it was off down there). I used LVEA10's network cable from the Biergartens dust monitor so BSC8s cleanroom dust monitor is trendable as Dust mon LVEA10. The pumpless dust monitor in the biergarten is still taking samples but they're not being written to epics.

H1 General - HAM1 E/W Door Bolts Removed

corey.gray@ligo.org — Wed, 02 Apr 2025 14:56:35 -0700

Author: corey.gray@ligo.org

Report ID: 83704

Tony, Corey: HAM1 E/W Door bolts mostly removed; except for a set of 4-bolts on each door which were detorqued and their nut backed off a 1/2 turn.

H1 SQZ - Comment to Rough Balancing of OPOS Complete

camilla.compton@ligo.org — Wed, 02 Apr 2025 12:16:45 -0700

Author: camilla.compton@ligo.org

Report ID: 83703

This was not updated in ISC, ASSY-D1500295-D1500295-H1, I have now removed D1500420, D1500422, D1500423, D1500479 x1, D1500480 x2, and added D1500419-v4 02, D1500421-v3 s/n1, D1900503-v1 005 to the record. The D060359 parts are bulk so not updated, more were added when balancing in chamber 59939.

SUS

H1 CDS - Comment to VACSTAT: gauges in vent area removed from system

david.barker@ligo.org — Wed, 02 Apr 2025 10:34:21 -0700

Author: david.barker@ligo.org

Report ID: 83702

HAM1 alarms have been removed from the system for the duration of the vent.

LHO VE - Wed CP1 Fill

david.barker@ligo.org — Wed, 02 Apr 2025 10:23:08 -0700

Author: david.barker@ligo.org

Report ID: 83701

Wed Apr 02 10:04:28 2025 INFO: Fill completed in 4min 25secs

Fill tripped on a LN2 spurt before the main flow, but still looks like a good fill.

Images attached to this report

H1 CDS - Timing glitch h1sush7, all models restarted

david.barker@ligo.org — Wed, 02 Apr 2025 10:05:20 -0700

Author: david.barker@ligo.org

Report ID: 83698

Ibrahim, Ryan S, Erik, Dave:

Around the same time as there was work being done at the corner station mechanical room mezzanine, h1sush7 had a timing glitch requiring the restart of the h1iopsush7 model (and therefore all user models).

Ibrahim and Ryan S consolidated the SDFs for h1susfc1, h1sussqzin and verified the mezanine work was completed.

We restarted all the models, reset the SWWD, cleared IPC and CRC errors to return the system to nominal.

I have added this event to an already opened ticket for h1sush7 FRS20317

Wed02Apr2025
LOC TIME HOSTNAME MODEL/REBOOT
09:55:21 h1sush7 h1iopsush7
09:55:35 h1sush7 h1susfc1
09:55:49 h1sush7 h1sussqzin
09:56:03 h1sush7 h1susauxh7

Images attached to this report

LHO VE - Comment to HAM6 Interlock Status After HAM6 Vacuum Gauge Failure Last Night

filiberto.clara@ligo.org — Wed, 02 Apr 2025 10:04:53 -0700

Author: filiberto.clara@ligo.org

Report ID: 83700

HAM6 interlock has been restored. HAM6 gauge is scheduled to be replaced during upcoming vent. See alog 83695.

H1 General - Comment to High Voltage Shutdown Preparation

filiberto.clara@ligo.org — Wed, 02 Apr 2025 10:02:58 -0700

Author: filiberto.clara@ligo.org

Report ID: 83699

The interlock for HAM6 that was bypassed last December (alog 82011) has been restored. The gauge on HAM6 is scheduled to be replaced during the upcoming vent.

H1 General - Comment to High Voltage Shutdown Preparation

filiberto.clara@ligo.org — Wed, 02 Apr 2025 09:59:19 -0700

Author: filiberto.clara@ligo.org

Report ID: 83697

WP 12434
WP 12260
Procedure M1300464

The following high voltage power supplies/electronics were powered off in preparation for the corner vent.

1. CER Mezzanine - ESD HV
2. CER Mezzanine - Fast Shutter HV
3. CER Mezzanine - OMC PZT HV
4. CER - SR3 and ITM heaters
5. LVEA - Fast Shutter Driver Chassis - Disabled and powered off
6. MER Mezzanine - HAM7 PSAMS HV
7. MER Mezzanine - HAM7 Piezo HV

Images attached to this report

H1 General - Comment to High Voltage Shutdown Preparation

ryan.short@ligo.org — Wed, 02 Apr 2025 09:30:58 -0700

Author: ryan.short@ligo.org

Report ID: 83696

I disabled all picomotor drivers (usually we keep these all disabled anyway, but still Squeezer HAM7 was the only one enabled) and turned off all SQZ TECs. The instructions only list the OPO, but there are three more: OFI, SFI1, and SFI2. I turned these off by switching the Servo toggle to "Off" in the upper-right of each TEC's medm screen (screenshot attached).

SQZ

Images attached to this report

H1 General - High Voltage Shutdown Preparation

ibrahim.abouelfettouh@ligo.org — Wed, 02 Apr 2025 09:26:33 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83695

Ryan S, Ibrahim

In prep for Fil turning off the high voltages, we ramped down and disabled some systems that use it, outlined in M1300464 (screenshot attached of specific page).

The following settings were changed:

ZM4/5 PSAMs ramped down - not in the above doc but on Fil's WP by Sheila's suggestion
Pico High Voltages were disabled
SQZ Opo TECs disabled

Images attached to this report

H1 PEM - HAM1 dust monitor

ryan.crouch@ligo.org — Wed, 02 Apr 2025 09:02:15 -0700

Author: ryan.crouch@ligo.org

Report ID: 83694

Yesterday I moved a pumped dust monitor into the HAM1 clean room (dust monitor LVEA5). I set the alarm levels to clean-100 following E1600132 and took a look at the trend overnight. The 0.5u particle count was steady around zero and the 0.3u was around ~10 counts overnight.

Images attached to this report

H1 CDS - VACSTAT: gauges in vent area removed from system

david.barker@ligo.org — Wed, 02 Apr 2025 08:48:43 -0700

Author: david.barker@ligo.org

Report ID: 83693

Janos, Gerardo, Dave:

Following some alarms overnight we have decided to remove the LVEA gauges from VACSTAT for the duration of the vent. The other gauges which will remain under vacuum continue to be monitored, but without the increased sensitivity settings.

In order to keep the EDC green, a vacstat_dummy_ioc.py is running on opslogin0 to simulate the channels associated with the removed gauges (HAM1, HAM6, BSC2, BSC3).

The cell phone alarms to the vacuum group on multiple vacstat detections has also been disabled.

Images attached to this report

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Wed, 02 Apr 2025 07:46:28 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83692

TITLE: 04/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 6mph Gusts, 4mph 3min avg
    Primary useism: 0.17 μm/s
    Secondary useism: 0.17 μm/s
QUICK SUMMARY:

IFO is in PLANNED ENGINEERING for the vent.

Today's vent tasks:

Crane engine hoist to BSC8 (FAC)
Inspect HAM1 and BSC8 final cleanroom (FAC)
Turn on HAM1 cleanroom and garb room (FAC)
Power down ISC chassis that will be recabled (Fil/EE)
Pull ISC cables - NOT COAX yet and work to relabel (Fil/EE)
HAM1 Offload HEPI Setup (SEI/Jim/Mitchell)
Leak check corner under vac (VAC)
Prep for corner vent (VAC)
Checklist for HAM1 vent (VAC)
HAM1 1st cleaning (Kim/Nellie/FAC)
Clean out recieving for ISI (FAC)
HAM6 Guage Work (VAC)
Checklist for corner vent (VAC)
Move forklift to HAM1 south bay area (FAC)
Crane or move power bang box to southbay for cleanrooms (FAC)
Replace ~3ft of cleanroom panel for HAM2 +Y-X (FAC)
Vent HAM1 (VAC)
Start HAM1 bolt removal (VAC/Randy)
Move HAM1 cleanroom into final place (5 people)
Stock garb room by HAM3 (FAC/Kim)
Prep laydown areas for stack deinstall, setup door pallet at HAM3+Y
Get dust mons working and trending (OPS/RyanC)

Work safe!

H1 CDS - CDS EE Work On HAM1

filiberto.clara@ligo.org — Tue, 01 Apr 2025 18:24:37 -0700

Author: filiberto.clara@ligo.org

Report ID: 83691

WP 12424
The field cabling for RM1 and RM2 was disconnected in the CER and field rack. Cables were pulled back from ISC-R4 to SUS-R1. Cables were installed early on and buried in the cable tray. It was decided to cut the connector to ease cable work. Ends will need to be re-terminated. The PM1 field cables arrived onsite and will be installed tomorrow. Work will be outside the HAM1/2 clean room.

WP 12393
The SEI field cables were pulled to the following HAM1 flange locations:

Corner 1 (GS-13, L4C, ISI Coil Drive) to Flange D1
Corner 2 (GS-13, L4C, ISI Coil Drive) to Flange D5
Corner 3 (GS-13, L4C, ISI Coil Drive) to Flange D3
HEPI Corner 1&2 to Flange D5
HEPI Corner 3 to Flange D3

WP 12421
Cabling to IOHT2L and ISCT1 was disconnected. Both sets of cables were pulled out of the clean room, clear of any HAM1 activities. The safety interlock system was tripped when cables were being moved off ISCT1. Safety system was restored. The field EtherCAT field boxes EL1908 and cables are located on top of HAM1. They should not interfere with door removal/install.

WP 12422
The vertical cable tray, conduit and part of the floor cable tray was removed to clear the HAM ISI Installation Fixture. Cables to ISCT1 are now routed along the cable tray outside of the clean room.

We took time to pull out various DB cables, fibers, RF cables ect that were not being used. Area around HAM1 is now clear. Let us know you see or need anything else moved/cleared for the ISI install.

F. Clara, O. Patane, M. Pirello

Images attached to this report

LHO VE - 2025 April vent - VAC diary

janos.csizmazia@ligo.org — Tue, 01 Apr 2025 18:04:44 -0700

Author: janos.csizmazia@ligo.org

Report ID: 83690

- The corner station clean air supply (Kobelco) was started up - The following GVs have been closed: GV5, GV2, RV1, FCV1, FCV2, FCV3, FCV4, FCV5 - The IPs adjacent to this part of the corner volume have been valved out: IP1, IP2, IP3, IP4, IP14 - The replacement of the HAM6 gauge was attempted, but the electronics of the brand new Inficon replacement gauge is faulty, therefore another one will be installed tomorrow - The Y-manifold turbo has been valved in with a leak checker backing, and the following flanges have been leak checked (no leaky flanges yet): - Y-manifold flanges: - X-; Y+ flanges (3 pcs.) - Vent port (1 pc.) - BSC8: - X- HEPI bellows (2 pcs.) - X- collar flanges (4 pcs.) - X+ Y+ side flanges (3 pcs.) - X+ door flanges (5 pcs.) - HAM2-HAM3 spool: - X+ Y+ side flanges (5 pcs.) - X+ bottom flange (1 pc.) - HAM3: - Y+ door flanges: (5 pcs.) - X- bottom flange (1 pc.) - Y+ bellows (2 pcs.)

H1 SUS - Comment to Calibrating the PR3 OSEMs

edgard.bonilla@ligo.org — Tue, 01 Apr 2025 16:43:48 -0700

Author: edgard.bonilla@ligo.org

Report ID: 83689

One way to fix the cross-coupling without having to get the absolute calibration is to slightly modify the M1 PR3 osem gains. They currently sit at:

T1 T2 T3 LF RT SD

1.161 0.998 1.047 1.171 1.163 1.062

Their new values would be at

T1 T2 T3 LF RT SD

1.164 0.903 0.866 1.073 1.199 0.942

This change will still leave a scaling factor of 1.54 m/(OSEM m), but at least it should fix the L-Y and the V-P-R cross couplings.

SEI, SUS

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Tue, 01 Apr 2025 16:33:02 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83688

TITLE: 04/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in PLANNED ENGINEERING for VENT

Extremely productive first vent day in which the following planned tasks were completed:

Transition to Laser SAFE - vent, close light pipes, keys off (TJ) - DONE
Turn Guard States to appropriate DOWN states (OPS) - DONE
Close gate valves (VAC) - DONE
Get purge systems going (VAC) - DONE
Lock all HAM HEPIs (JIM/SEI) - DONE
Crane large West Bay cleanroom over BSC8, inspect (FAC) - DONE
Crane engine hoist to BSC8 (FAC)
Inspect HAM1 and BSC8 final cleanroom (FAC)
Turn on HAM1 cleanroom/garb room
Disconnect ISCT1 cables and see if needed on IOT2 (EE/Fil) - DONE
Disconnect cable trays from HAM1 (EE/Fil) - DONE
Mark and move ISCT tables at HAM1 and HAM2 (Camilla/AOS) - DONE - alog 83686
Remove scaffolding on HAM1/2 +Y (TJ) - DONE - alog 83686
Power down ISC chassis that will be recabled (Fil/EE)
Pull ISC Cables - NOT COAX yet and work to relabel
HAM1 Offload HEPI Setup (Jim/Mitchell/SUS)
Leak Check corner under vac (VAC)
Prep for corner vent (VAC)
Checklist for HAM1 Vent (VAC)
Set ESD bias drive to XX to reverse charge trend while vented (OPS) - DONE

As always, check out the trello for the most up to date vent news.

Guardian states are in the configurations attached in the screenshot

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:39	FAC	Eric	Woodshop	N	Activate Fire Pumps	16:21
15:05	EE	Fil	LVEA	N	HAM1/2 Table Enclosure Disconnect	23:52
15:10	FAC	Kim, Nellie	FCES	N	Technical Cleaning	15:39
15:12	OPS	TJ	LVEA	N	LVEA to Laser Extra Safe (Keys, Light Pipes etc)	15:30
15:34	PCAL	Tony	PCal Lab	Local	Meas. Setup	16:47
15:39	FAC	Kim	EX	N	Technical Cleaning	17:00
15:40	FAC	Nellie	EY	N	Technical Cleaning	16:22
16:09	AOS	Betsy	OptLab	N	Power meter	16:22
16:24	FAC	Tyler, Eric	LVEA	N	Scissor lift, Crane Work	18:27
16:24	SAF	Camilla	LVEA	N	Guillotine for viewports	19:05
16:26	VAC	Janos, Gerardo, Travis, Jordan	LVEA	N	Corner Vent Prep	19:25
16:26	EE	Betsy	LVEA	N	Checking on Fil team	17:11
16:36	AOS	TJ	LVEA	N	Wrap Bag Tag Help	19:05
16:46	SEI	Jim	LVEA	N	Locking HAM HEPIs	18:01
17:01	FAC	Kim, Nellie	LVEA	N	Technical cleaning	18:49
17:30	FAC	Richard	LVEA	N	HAM1 Conduit	17:45
17:43	AOS	Ibrahim	LVEA	N	Moving ISC tables	19:05
17:51	FAC	Betsy	LVEA	N	Looking at cabling	19:05
18:09	ISC	Rahul, Mayank, Siva	OptLab	Local	ISS array work	22:56
18:20	CAL	Tony	PcalLab	Local	Measurement setup	18:30
18:25	SEI	Jim, Mitchell	FCES, Ends	N	Picking up parts and FAMIS tasks	21:20
19:17	FAC	Chris, Eric, Tyler, Randy	LVEA	N	Cleanroom move	20:52
19:35	EE	Oli	LVEA	N	Helping Fil	22:29
19:43	VAC	Gerardo	LVEA	N	Cleanroom move help	22:06
19:58	AOS	TJ, Camilla	LVEA	N	Move Scaffolding by HAM1/2	20:34
20:07	VAC	Janos, Jordan	LVEA	N	Leak Checks	22:06
20:14	PCAL	Tony	PCAL Lab	N	PCAL Meas.	20:20
20:46	ALS	TJ	EX, EY	N	Turning on ALS	21:27
20:56	FAC	Tyler	LVEA	N	Sock Swap	21:38
21:33	TCS	Matt, Camilla	OptLab	Local	CO2 Table Work	22:56
21:52	SEI	Mitchell	LVEA	N	Seismic Assy Size Verification	21:58
21:53	AOS	Betsy	LVEA	N	Walkabout	22:33
22:06	EE	Marc	LVEA	N	Helping Fil and Oli with HAM 1/2 Table Enclosures	00:05
22:07	VAC	Janos	LVEA	N	Leak Checks	22:41
22:41	VAC	Travis, Gerardo, Jordan	LVEA	N		23:41
22:42	FAC	Tyler	LVEA	N	Rigging Transportation	22:53
23:14	AOS	Betsy	LVEA	N		23:25
23:29	OPS	Ryan C	LVEA	N	Dust monitor connectiom	00:29

Images attached to this report

H1 CDS - Comment to bypassed fire pump cell phone alarms during pump testing this morning

david.barker@ligo.org — Tue, 01 Apr 2025 15:46:39 -0700

Author: david.barker@ligo.org

Report ID: 83687

Alarms has been reconfigured to expect GV2 and GV5 to be in the hard-closed position and alarm if not.

H1 General - ISCT1 and IOT2 moved away from HAM1/2, HAM2 Scaffolding Removed

camilla.compton@ligo.org — Tue, 01 Apr 2025 13:59:12 -0700

Author: camilla.compton@ligo.org

Report ID: 83686

TJ, Ibrahim, Betsy, Camilla, WPs 12428, 12414

We added guillotines to all VPs, removed the bellows and added yellow VP covers. IOT2 bellows were very tight so couldn't be removed until we moved the table an ~inch away from HAM2. The tables bellows adapters were covered with ameristat and the bellows were covered with foil and placed on a nearby rack. Photo.

We moved the small garbing cleanroom up against the TSCY / the HAM3 cleanroom. We moved ISCT1 and IOT2 next to it on the other side of the racks, leaving space and a pallet for the HAM1 door. Photo.

TJ and I removed and disassembled the HAM2 scaffolding and stored it with the other scaffolding in the High bay.

Images attached to this report

H1 TCS - Comment to L5 Laser Beam Scan

matthewrichard.todd@ligo.org — Tue, 01 Apr 2025 11:33:06 -0700

Author: matthewrichard.todd@ligo.org

Report ID: 83684

Code for analyzing this data

Non-image files attached to this report

razor_blade_data.py

LHO VE - Comment to Tue CP1 Fill

david.barker@ligo.org — Tue, 01 Apr 2025 10:53:55 -0700

Author: david.barker@ligo.org

Report ID: 83683

TC-B temperature jumped up from -3C to about +15C at 05:04 PDT this morning, possible sensor movement.

Images attached to this report

LHO VE - Tue CP1 Fill

david.barker@ligo.org — Tue, 01 Apr 2025 10:36:07 -0700

Author: david.barker@ligo.org

Report ID: 83682

Tue Apr 01 10:12:47 2025 INFO: Fill completed in 12min 43secs

Images attached to this report

H1 CDS - turned on all CDS Wifi WAPS, accepted this configuration in CDS SDF

david.barker@ligo.org — Tue, 01 Apr 2025 10:07:51 -0700

Author: david.barker@ligo.org

Report ID: 83681

Images attached to this report

H1 CDS - Comment to bypassed fire pump cell phone alarms during pump testing this morning

david.barker@ligo.org — Tue, 01 Apr 2025 09:12:55 -0700

Author: david.barker@ligo.org

Report ID: 83680

We are getting multiple VACSTAT alarms as gatevalves are being closed, so for now I've bypassed those cell phone alarms.

H1:CDS-VAC_STAT_GLITCH_DETECTED

H1 CDS - Comment to bypassed fire pump cell phone alarms during pump testing this morning

david.barker@ligo.org — Tue, 01 Apr 2025 08:45:26 -0700

Author: david.barker@ligo.org

Report ID: 83679

Added GV5 position alarm to bypass

H0:VAC-LY_GV5_ZSM159A_VALVE_ANIM

H1 CDS - Comment to bypassed fire pump cell phone alarms during pump testing this morning

david.barker@ligo.org — Tue, 01 Apr 2025 08:40:48 -0700

Author: david.barker@ligo.org

Report ID: 83678

Added PT114 (CP1)

Bypass will expire:
Tue Apr 1 12:40:00 PM PDT 2025
For channel(s):
H0:FMC-CS_FIRE_PUMP_1
H0:FMC-CS_FIRE_PUMP_2
H0:VAC-LY_Y3_PT114B_PRESS_TORR

H1 PSL - PSL Cooling Water pH Test

ryan.short@ligo.org — Tue, 01 Apr 2025 08:39:34 -0700

Author: ryan.short@ligo.org

Report ID: 83677

FAMIS 24833

pH of PSL chiller water was measured to be between 10.0 and 10.5 according to the color of the test strip.

H1 SQZ - Comment to SQZ Drops H1 From OBSERVING & SQZ SHG Fiber Rejected Power High

camilla.compton@ligo.org — Tue, 01 Apr 2025 08:29:32 -0700

Author: camilla.compton@ligo.org

Report ID: 83676

Camilla, Sheila.

The drop was because the OPO PZT ran out of range, see t-cursor on attached plot. It's a known issue that the SQZ angle (and alignment) changes with different PZT1 voltage.

It seems like that the sqz angle was set for 60-70V and was bad once we relocked at 100V. This would have been improved by taking SQZ_MANAGER to SCAN_SQZANG_FDS so it can find the best sqz angle again. If we were running the SQZ_ANG_ADJUST servo, this may have improved itself as you can see the ADF reported SQZ angle change at the time.

With the higher (19 vs 11) NLG 83665, the range and 350Hz SQZ (yellow BLRMS) does seem to be improved, but the high frequency SQZ did seem to be less stable as we thermalized.

Images attached to this report

H1 CDS - bypassed fire pump cell phone alarms during pump testing this morning

david.barker@ligo.org — Tue, 01 Apr 2025 07:54:41 -0700

Author: david.barker@ligo.org

Report ID: 83675

Eric, Dave:

Bypass will expire:
Tue Apr 1 11:52:44 AM PDT 2025
For channel(s):
H0:FMC-CS_FIRE_PUMP_1
H0:FMC-CS_FIRE_PUMP_2

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Tue, 01 Apr 2025 07:43:25 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83674

TITLE: 04/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING, but not for long.

H1 was running PEM Mag injections when I walked in, which finished and went into OBSERVING thereafter. I will induce a lockloss and set IFO to PLANNED ENGINEERING shortly.

Today is the first day of our planned Vent Break! Here is a summary of today's planned activities, also found on Trello Coordination Page

Transition to Laser SAFE - vent, close light pipes, keys off (TJ)
Turn Guard States to appropriate DOWN states (OPS)
Close gate valves (VAC)
Get purge systems going (VAC)
HAM1 vent checklist (VAC)
Corner vent prep (VAC)
Corner leak check (VAC)
Lock all HAM HEPIs (JIM/SEI)
Crange large West Bay cleanroom over BSC8, inspect (FAC)
Crane engine hoist to BSC8 (FAC)
Inspect HAM1 and BSC8 final cleanroom (FAC)
Turn on HAM1 cleanroom/garb room

Work safe everybody!

H1 CDS - Workstations updated

erik.vonreis@ligo.org — Tue, 01 Apr 2025 07:02:58 -0700

Author: erik.vonreis@ligo.org

Report ID: 83673

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

LHO General - Mon EVE Ops Summary

corey.gray@ligo.org — Mon, 31 Mar 2025 22:02:06 -0700

Author: corey.gray@ligo.org

Report ID: 83670

TITLE: 03/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

Tonight is the last in-person Operator shift (TJ is the last OWL) before the April-Jun2025 Maintenance+Commissioning Break which begins at 8am (Local Time) tomorrow morning.

H1 has been stellar. Rode through an Alaskan EQ and is going on almost 7.75hrs of lock. And the range has been higher than normal (just under 159Mpc)....but then it went back to the normal 150Mpc after the SQZ lost lock and relocked toward the end of the shift.
LOG:

ISS Array group continues work in the Optics Lab (myank, siva, jennie, keita, rahul)
- 0015 jennie, rahul, and keita left
- 0215 myank, siva left
0022 Drive to welding shop (vpw bldg) to drop off tooling (jim)
0411 Incoming M5.2 EQ from Alaska (Verbal said Canada) at about 2800miles away. H1 rode through this EQ fine; there was no wind and secondary microseism is just about between the 50th & 95th percentile lines.
0436-0439 Dropped from OBSERVING due to SQZ (which restored automatically). SQZ SHG Fiber Rejected Power has been high and has a message about this.

H1 SQZ - SQZ Drops H1 From OBSERVING & SQZ SHG Fiber Rejected Power High

corey.gray@ligo.org — Mon, 31 Mar 2025 21:56:42 -0700

Author: corey.gray@ligo.org

Report ID: 83672

Just had a ~3min drop from OBSERVING due to SQZ, but it cameback automatically.

Did notice the SQZ_OPO_LR node has the familiar User Message:

"pump fiber rej power in ham7 high, nominal 35e-3, align fiber pol on sqzt0"

It's been trending up the last 5 days when it was last touched up on 3/26 (alog83570). Looks like it moved above 0.35 counts at 10am (local time) this morning. See attached.

It's been a few minutes and one can see H1's range took a step down about 6Mpc after this SQZ drop.

SQZ

Images attached to this report

H1 TCS - L5 Laser Beam Scan

matthewrichard.todd@ligo.org — Mon, 31 Mar 2025 17:12:28 -0700

Author: matthewrichard.todd@ligo.org

Report ID: 83669

[M. Todd, C. Compton]

Camilla and I made several knife edge measurements of the L5 CO2 laser in the optics lab after she got back from her trip to Access. The beamwidth estimates are consistent with tests done by Gabriele and Camilla

Measurements:

20250327 - razorblade 16cm from laser aperature
20250328 - razorblade 16cm from laser aperature (moved laterally to have more range)
20250328v2 - razorblade 16cm from laser aperature

Results:

Fits to both the numerical derivative and cumulative yield similar estimates of the beamwidth (1/e^2 radius) : around 1.3mm at 16cm from the aperature is consistent with the beam profiles done in Gabriele and Camilla's test, which estimated the beam waist to be around 1.2mm.

Images attached to this report

H1 SEI - H1 ISI CPS Sensor Noise Spectra Check - Weekly FAMIS

ibrahim.abouelfettouh@ligo.org — Mon, 31 Mar 2025 16:41:23 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83671

Closes FAMIS 26036. Last checked in alog 83560.

Overall much quieter traces across all plots from last week's. Namely, the 7.6Hz to 9Hz elevated signals and peaks that Oli found seem to be gone. Plot attached.

SEI

Non-image files attached to this report

CPS_spectra_16:32-03_31_2025.pdf

LHO General - Mon Eve Ops Transition

corey.gray@ligo.org — Mon, 31 Mar 2025 16:31:28 -0700

Author: corey.gray@ligo.org

Report ID: 83667

TITLE: 03/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 19mph Gusts, 12mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.17 μm/s
QUICK SUMMARY:

Ibrahim is handing over an H1 which has been at Nominal Low Noise for 2+hrs (and a nicer range just under 160Mpc---woo woo Sqz commissioning work this morning). Ibrahim also schooled me on when wind at EY can cause us grief if it hits EY at a pesky angle---like it was at 2000utc today).

Speaking of winds, it's continues to be generally below 25mph for the last 12hrs (but the forecast says it should drop after sunset. Secondary microseism had a small hump up between 10-22hrs ago and hovers just over the 50th percentile.

LHO General - OPS Day Shift Summary

ibrahim.abouelfettouh@ligo.org — Mon, 31 Mar 2025 16:30:58 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83668

TITLE: 03/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 21:24 UTC

Overall calm final day of O4b with a successful comissioning session. Things of note:

Lockloss 1: ETM Glitch Caused
Lockloss 2: Wind Caused
- We are more susceptible to wind coming in from the 40-70 degree range due to the one torn wind fence panel (attached screenshot). Elevated 0.3-1Hz and 0.03-0.1Hz EY ground motion was preventing locking for around 1 hr despite only 25-30 mph winds.
Hanford Site called around 12:30 PT to warn of planned sirens and drills though we were unlocked

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:17	FAC	Nellie	MX	N	Technical Cleaning	16:12
15:17	FAC	Kim	MY	N	Technical Cleaning	16:11
17:10	FAC	Kim	H2 Building	N	Technical Cleaning	17:18
17:43	ISC	Mayank, Siva, Keita	OptLab	Yes	ISS Array work	19:30
21:11	ISC	Jennie, Mayank, Rahul, Keita, Sivananda	Optics Lab	Yes	ISS Array Work	00:11

H1 SQZ - Comment to SQZ Data set with high NLG, then adjusted SRCL offset and FC detuning.

sheila.dwyer@ligo.org — Mon, 31 Mar 2025 15:58:55 -0700

Author: sheila.dwyer@ligo.org

Report ID: 83666

Here are some preliminary plots from Camilla's data set of different squeezing angles taken at an NLG of 58 with the SRCL offset at it's nominal -191 counts setting, which we believe is about 13 mrad SRC detuning.

The first plot shows some assumptions that go into making this model, we start with an assumption about arm power, use the noise budget estimate of non quantum noise at 2kHz (which may be out of date now), and set the readout losses to fit the no squeezing data at 2.1-2.3kHz. Then subtract this quantum noise model without squeezing from the no squeezing data, and use that as an estimate of the non-quantum noise, which can be added to all of the quantum noise models for different squeezing angles to compare to the measurement. (second plot is a somewhat overwhelming plot of all this added for completeness).

I've set the phase noise to 0 based on 83457. Using the level of sqz and anti-squeeze at 2.1-2.3 kHz, we infer that the NLG was 63 and the total efficency was 66.5%. Camilla measured the NLG to be 58, for 120uW circulating power, but in 83370 she measured 61-63 for 120uW. The third plot here shows the data that Camilla took with the LO loop unlocked, so that the squeezing angle is averaging and rotating freely. Using this and knowledge of the NLG, we should be able to infer the total squeezing efficiency as a function of frequency. Doing the subtraction of non quantum noise increases the infered efficiency, (compare thick lines to thin), the two different values of NLG suggest rather different efficiencies. There is evidence that the efficiency frequency dependent, which could be caused by a number of effects. Below 200 Hz there is some excess noise in the mean sqz trace, as you can see here, which causes the efficiency infered to be above 1.

The next two plots show the model broken into more readable plots, with the only thing I've adjusted by hand being the SRC detuning. There is a discrepancy between the model + noise for the anti-squeezing and anti-squeezing +/-10 degrees traces without the filter cavity, which seems like it could be some excess noise that is similar for the different traces. This is similar to the discrepancy seen in the last plot in 82097, but it is larger in this higher NLG dataset.

Images attached to this report

H1 SQZ - SQZ with SRCL offset at -306, FC detuing at -28

camilla.compton@ligo.org — Mon, 31 Mar 2025 14:33:38 -0700

Author: camilla.compton@ligo.org

Report ID: 83660

Sheila, Camilla, Jennie

This morning we changed SRCL offset from -191 to -306 and FC de-tuning from -34 to -28, as discussed in 83570. Took some SQZ data here as we were interested if we could get FIS SQZ lower than No SQZ ~100Hz and below, Sheila's models (e.g. 83572) suggest we should but it looks like there's a low frequeceny noise source (in FIS not FDS) in our data sets preventing us from getting down to the modeled level of SQZ.

Sheila turned OPO trans setpoint up from 80uW to 95uW to increase NLG from 11 to 19 (similar to what we had earlier in O4). Measured NLG with 76542. OPO gain left at -8. Turned off SQZ ASC.

opo_grTrans_ setpoint_uW	Amplified Max	Amplified Min	UnAmp	Dark	NLG (usual)	NLG (maxmin)	OPO Gain
95	0.0176	0.000279	0.00002	0.00094	19.1	20.0	-8
110	0.03315	0.000269	0.000879	-0.00002	35		-8

Starting FC2 misaligned offsets in M1 TEST were 100 and 200, Sheila increased to 200 and 400. So that we know FC2 is really misaligned. Saw no difference at SQZ or ASQZ. So this low fruecny noise in FIS is not due to FC backscatter.

Data attached and saved at camilla.compton/Documents/sqz/templates/dtt/20250331_SRCL_neg306.xml

Type	Time (UTC)	Angle	Notes	DTT Ref
No SQZ	03/29	N/A		ref 0
FIS SQZ		171	Angle tuned for FDS (maybe thermalized since)	ref1
FIS SQZ	17:05:00	154	Ang tuned for FIS	ref2
FIS Mid(ish)	17:15:00	101	Little better than no SQZ at 60Hz	ref3
FIS Mid(ish)		92		ref4
ASQZ FIS		68		ref5
ASQZ FIS -10deg	17:24:00	58		ref6
ASQZ FIS +10deg		78		ref7
FIS Mid(ish)	17:31:30	115		ref8
FIS Mid(ish) other side	17:43:00	27		ref9
FIS Mid(ish)	17:45:30	82	Check data doesn't include a glitch	ref10

Then changed the SRCL de-tuning back to -191 (still in FIS so FC de-tuning doesn't matter). Comparison is attached.

This SRCL offset change didn't effect the level of low frequency noise.

Type	Time (UTC)	Angle	Notes	DTT Ref
FIS ASQZ +10deg	17:53:00	82	Plot seems similar with same ang, different SRCL offset	ref 11
FIS ASQZ	17:56:00	72		ref12
FIS ASQZ -10deg		62		ref13
FIS Mid (ish)		104	Can see that rotation is a little different with SRCL de-tuning different but low freq noise level is the same.	ref14

Kept SRCL de-tuning at -191 but increased NLG to 35.

This was interesting for mid-SQZ values as the level of the low freq noise increased with the higher NLG but was the same at different SQZ angles (112 and 100deg). Plot attached. Compare grey and pink (NLG 35) to blue and brown (NLG19) <70Hz. So the low frequency FIS noise is NLG dependent.

Type	Time (UTC)	Angle	Notes	DTT Ref
Mid SQZ		112	Interesting data here. Low freq noise higher than with NLG 19.	ref 15
ASQZ	18:20:00	70		ref16
MidSQZ	18:22:30	100		ref17

Sheila turned OPO trans back to 96uW so expect NLG to be 19 going into Observing, larger than normal but closer to the value uses before the last OPO crystal move. SQZ angle servo off and angle set back to 171. ADF left on.

Images attached to this report

H1 SQZ - SQZ NLG increased from 11 to 19. ADF back on.

camilla.compton@ligo.org — Mon, 31 Mar 2025 14:24:57 -0700

Author: camilla.compton@ligo.org

Report ID: 83665

Today during commissioning we increased the SQZ NLG from 11 to 19, now the nominal OPO trans setpoint in sqzparams in 95uW. This was because before our last OPO crystal move 82134, the NLG was closer to 17-19.

We also turned the ADF (322Hz line) back on, it had been off since March 27th 83621, tagging DetChar.

DetChar

H1 SQZ - SQZ angle servo during thermalization

sheila.dwyer@ligo.org — Mon, 31 Mar 2025 14:23:47 -0700

Author: sheila.dwyer@ligo.org

Report ID: 83658

Sheila, Camilla

The IFO was just relocking at the start of commissioning time today, so we set the ADF back on and the sqz angle servo on. This worked fine, with the phase shifter staying well within it's range (it stayed between 180 and 130 degrees, it's range is 0 -270 degrees).

In the attached screenshot the vertical cursors are both at 25 minutes into the lock. You can see that the SQZ BLRMS and the range behave differently with the servo on, but in both cases they start with a low range and move up slowly. We think that the set point of the squeezing angle servo wasn't set ideally for this time.

In the second screenshot you can see that I changed the SRCL offset and the servo responded to it, taking about 3 minutes to settle.

Images attached to this report

H1 ISC - Future Beamdump placement behind HAM1 RM3/PM1 tip-tilt

camilla.compton@ligo.org — Mon, 31 Mar 2025 13:35:19 -0700

Author: camilla.compton@ligo.org

Report ID: 83664

Rahul, Betsy, Camilla

Attached are some photos of the proposed location of the beamdump that will be placed behind the HAM1 RM3 / PM1 tip-tilt with new D2500101 attached to existing Tip-Tilt DSUB Bracket Holder D1101430. In reality the beamdump will be placed at the mirror image of the photos as the HAM1 beam will be coming the opposite incoming angle.

The Beamdump is made from:

QTY2 D1800140-02 (Beam Dump)
QTY1 D1000972 (V-holder)
QTY2 D1100705 (PEEK Set screw #8-32 x 3/16)
QTY1 C-2010-A 1/4-20 x 0.63" SHCS, Silver plated

SUS

Images attached to this report

H1 General - Lockloss 19:29 UTC

ibrahim.abouelfettouh@ligo.org — Mon, 31 Mar 2025 12:35:23 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83663

Lockloss right after we got back to OBSERVING with good range.

First impression of cause is that it might be wind related since:

35 mph gusts are coming through
EY primary microseism has been steadily rising
There was visible instability in ASC prior to lockloss

Relocking again now.

Lockloss

H1 SUS - Comment to cross-coupling and reciprocal plants

jeffrey.kissel@ligo.org — Mon, 31 Mar 2025 12:03:33 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83662

@Brian, Edgard -- I wonder if some of this ~10-20% mismatch in OSEM calibration is that we approximate the D0901284-v4 sat amp whitening stage with a compensating filter of z:p = (10:0.4) Hz? (I got on this idea thru modeling the *improvement* to the whitening stage that is already in play at LLO and will be incoming into LHO this summer; E2400330) If you math out the frequency response from the circuit diagram and component values, the response is defined by % Vo R180 % ---- = (-1) * -------------------------------- % Vi Z_{in}^{upper} || Z_{in}^{lower} % % R181 (1 + s * (R180 + R182) * C_total) % = (-1) * ---- * -------------------------------- % R182 (1 + s * (R180) * C_total) So for the D0901284-v4 values of R180 = 750; R182 = 20e3; C150 = 10e-6; C151 = 10e-6; R181 = 20e3; that creates a frequency response of f.zero = 1/(2*pi*(R180+R182)*C_total) = 0.3835 [Hz]; f.pole = 1/(2*pi*R180*C_total) = 10.6103 [Hz]; I attach a plot that shows the ratio of the this "circuit component value ideal" response to approximate response, and the response ratio hits 7.5% by 10 Hz and ~11% by 100 Hz. This is, of course for one OSEM channel's signal chain. I haven't modeled how this systematic error in compensation would stack up with linear combinations of slight variants of this response given component value precision/accuracy, but ... ... I also am quite confident that no one really wants to go through an measure and fit the zero and pole of every OSEM channel's sat amp frequency response, so maybe you're doing the right thing by "just" measuring it with this technique and compensating for it in the SENSALIGN matrix. Or at least measure one sat amp box's worth, and see how consistent the four channels are and whether they're closer to 0.4:10 Hz or 0.3835:10.6103 Hz. Anyways -- I thought it might be useful to be aware of the many steps along the way that we've been lazy about the details in calibrating the OSEMs, and this would be one way to "fix it in hardware." CSWG, SUS

Non-image files attached to this report

D0901284-v4_Whitening_compensationerror.pdf

LHO VE - Mon CP1 Fill

david.barker@ligo.org — Mon, 31 Mar 2025 11:43:36 -0700

Author: david.barker@ligo.org

Report ID: 83661

Mon Mar 31 10:09:31 2025 INFO: Fill completed in 9min 28secs

Images attached to this report

H1 PSL - PSL 10-Day Trends

ryan.short@ligo.org — Mon, 31 Mar 2025 10:10:32 -0700

Author: ryan.short@ligo.org

Report ID: 83659

FAMIS 31079

The temperature increase noted last week seems to have come back to normal for the most part after a few days.

Jason's RefCav alignment tweak 3 days ago is clearly seen and level has stayed relatively stable since.

PMC Refl hasn't been rising, but perhaps has gotten noisier starting a few days ago.

Images attached to this report

H1 General - Comment to Lockloss 14:39

ryan.crouch@ligo.org — Mon, 31 Mar 2025 09:16:01 -0700

Author: ryan.crouch@ligo.org

Report ID: 83657

Appears to have been an ETMX glitch

Images attached to this report

LHO General - Comment to OPS Day Shift Start

oli.patane@ligo.org — Mon, 31 Mar 2025 09:01:14 -0700

Author: oli.patane@ligo.org

Report ID: 83656

Confirmed not the PIs for either range drop (drop1, drop2). There was a small drop in range a few minutes before the second range drop around the same time as PI31 had a small ringup, but zooming in, the ringup happened multiple minutes before and so doesn't account for that quick drop either(ndscope3).

SUS

Images attached to this report

LHO General - Comment to OPS Day Shift Start

camilla.compton@ligo.org — Mon, 31 Mar 2025 08:59:14 -0700

Author: camilla.compton@ligo.org

Report ID: 83654

Ibrahim, Oli, Camilla

We had two 30+ minute range drops last night, plot attached. Looks to be mainly under 60Hz from the OMC BLRMs, plot.

Doesn't appear to be sqz, EX ground motion 83233, or CO2 ISS channel 82728 related. Oli also checked this wasn't PI related 82944.

DetChar, DetChar-Request

Images attached to this report

H1 ISC - POP 18 gains restored to their previous normal gain of 2

sheila.dwyer@ligo.org — Mon, 31 Mar 2025 08:46:27 -0700

Author: sheila.dwyer@ligo.org

Report ID: 83655

Last week Corey changed the gains of POP18 because of difficulties locking DRMI. 83540 To avoid having the histories of these POP18 build ups being confusing, I've moved the gain of 2 into the trigger matrix, and in sdf set the locking gains back to 2. (These gains were changed from 1 to 2 when the 50/50 splitter was added to the POP path.)

I've edited line 238 in ISC_DRMI to set the trigger matrix element to 2.

Images attached to this report

H1 General - Lockloss 14:39

ibrahim.abouelfettouh@ligo.org — Mon, 31 Mar 2025 07:41:51 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83653

Lockloss after 2 minute lock before reaching observing. No immediate apparent causes.

Lockloss

LHO General - OPS Day Shift Start

ibrahim.abouelfettouh@ligo.org — Mon, 31 Mar 2025 07:36:02 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83652

TITLE: 03/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 28mph Gusts, 23mph 3min avg
    Primary useism: 0.06 μm/s
    Secondary useism: 0.21 μm/s
QUICK SUMMARY:

IFO is LOCKING in LASER_NOISE_SUPPRESSION

Today we have planned comissioning from 8:30 to 11:30 local time.

The last lockloss seems to have been caused by wind and elevated microseism, though neither seem high enough to have necessarily caused a lockloss.

H1 CDS - Comment to VACSTAT alarm on BSC3 sensor glitch

david.barker@ligo.org — Sun, 30 Mar 2025 22:48:46 -0700

Author: david.barker@ligo.org

Report ID: 83651

Another BSC3 VACSTAT glitch at 22:40:58. Service was restarted at 22:27 to clear.

LHO General - Sun EVE Ops Summary

corey.gray@ligo.org — Sun, 30 Mar 2025 21:59:28 -0700

Author: corey.gray@ligo.org

Report ID: 83649

TITLE: 03/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

Nice shift with H1 running decently even as the weather turned a bit in the evening (w/ 30+mph winds and rain as the sun set....but then calmed down toward the end of the shift). At shift's end, H1's current lock is over 7hrs (with one GW-candidate).
LOG:

0135 Superevent S250331o

H1 CDS - VACSTAT alarm on BSC3 sensor glitch

david.barker@ligo.org — Sun, 30 Mar 2025 17:00:54 -0700

Author: david.barker@ligo.org

Report ID: 83650

We had a BSC3 sensor glitch at 16:39:16 resulting in a single VACSTAT alarm. I restarted the service at 16:50 to clear this alarm.

I also set the FMCS Reverse Osmosis alarm into silent mode so it will only email and not text for the next 24 hours.

Bypass will expire:
Mon Mar 31 04:57:28 PM PDT 2025
For channel(s):
H0:FMC-CS_WS_RO_ALARM

LHO FMCS - OPS Sunday DAY shift summary

ryan.crouch@ligo.org — Sun, 30 Mar 2025 16:31:40 -0700

Author: ryan.crouch@ligo.org

Report ID: 83642

TITLE: 03/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We've been locked for 1.5 hours. The ground has been doing the tectonic shuffle this morning with a group of earthquakes and aftershocks from Tonga, 7.0, 4.8, 6.1, 4.9, 5.8...
LOG: No log.

The porta potty outside the FCES has also been knocked over, and OSB receiving is blocked by tumbleweeds. (Tagging FMCS)

12:31:01 Earthquake mode activated
12:31:23 UTC 7.0 from Tonga arrived, lockloss
- 15:50 UTC 6.1 from Tonga arrived
- 16:55 UTC Initial alignment
- 18:16 UTC Observing
20:34 UTC lockloss from an ETMX glitch
- 22:55 UTC Observing, the SQZer seemed to lock at a slightly worse spot than the previous locks
- 22:30 another EQ from Tonga (5.2) came through but we survived

Images attached to this report

LHO General - Sun EVE Ops Transition

corey.gray@ligo.org — Sun, 30 Mar 2025 16:25:42 -0700

Author: corey.gray@ligo.org

Report ID: 83648

TITLE: 03/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 16mph Gusts, 11mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.15 μm/s
QUICK SUMMARY:

H1 has been at NLN for 1.5+hrs.

There is a CDS Alarm for the RO (reverse osmosis) system. Happened to phone Tyler earlier today with water questions and he mentioned he turned off both RO skids this morning (@943amPDT).

Environmental noise wise, secondary µseism is lower than 24hrs (looks like it's flattened out squarely at the 50th percentile about 7hrs ago). Winds are a little are a touch more breezy than yesterday, but still well under 20mph.

H1 General - Comment to 20:34 UTC Lockloss

ryan.crouch@ligo.org — Sun, 30 Mar 2025 15:01:26 -0700

Author: ryan.crouch@ligo.org

Report ID: 83646

21:55 UTC observing

H1 General - 20:34 UTC Lockloss

ryan.crouch@ligo.org — Sun, 30 Mar 2025 13:42:48 -0700

Author: ryan.crouch@ligo.org

Report ID: 83645

20:34 UTC lockloss, it appears to have been from an ETMX glitch

Lockloss

Images attached to this report

H1 General - Comment to OPS Sunday DAY shift start

ryan.crouch@ligo.org — Sun, 30 Mar 2025 11:16:44 -0700

Author: ryan.crouch@ligo.org

Report ID: 83644

18:16 UTC Observing

LHO VE - Sun CP1 Fill

david.barker@ligo.org — Sun, 30 Mar 2025 10:20:14 -0700

Author: david.barker@ligo.org

Report ID: 83643

Sun Mar 30 10:11:04 2025 INFO: Fill completed in 11min 1secs

TC-B slightly noisy.

Images attached to this report

H1 General - OPS Sunday DAY shift start

ryan.crouch@ligo.org — Sun, 30 Mar 2025 07:30:01 -0700

Author: ryan.crouch@ligo.org

Report ID: 83641

TITLE: 03/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Earthquake
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: EARTHQUAKE
    Wind: 8mph Gusts, 5mph 3min avg
    Primary useism: 0.51 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

12:31 UTC lockloss (EQ)
We're currently down from a 7.0 from Tonga, probably another two or three hours till the ground motion subsides enough for locking
SUS OPO and FC2 were tripped along with HAMs 2,3,4,5,7,8's ISIs