aLIGO LHO Logbook

LHO VE - Gate Valves are Open

gerardo.moreno@ligo.org — Thu, 05 Mar 2026 13:22:38 -0800

Author: gerardo.moreno@ligo.org

Report ID: 89381

(Travis S., Jordan V., Gerardo M.)

After taking an RGA, HAM7 chamber was joined to the corner vacuum envelope, we opened RV-1, FCV-1, FCV-2, FCV-3, FCV-4 and FCV-5, no issues to report.

Then we opened GV5 and GV7. GV7 started opening at 45 psi after a double clank noise, left GV7 set at 55 psi. GV5 took some time to open, we got up to 40 psi and then left it alone, for about 20 minutes, then increased pressure to 45 psi a loud clank and then the valve opened, GV5 was set at 55 psi.

WP13071 is closed now.

H1 SEI - March 2026 Wind Fence Inspection

jim.warner@ligo.org — Thu, 05 Mar 2026 10:32:48 -0800

Author: jim.warner@ligo.org

Report ID: 89380

I did the monthly wind fence inspection yesterday. No new issues. Damage to the one panel at EY seems stable, no damage noted at EX.

Images attached to this report

H1 CDS - Thu CP1 Fill

david.barker@ligo.org — Thu, 05 Mar 2026 10:15:22 -0800

Author: david.barker@ligo.org

Report ID: 89379

Thu Mar 05 10:10:28 2026 INFO: Fill completed in 10min 25secs

Images attached to this report

H1 PEM - H1 dust monitor Month Long Trends FAMIS37262

ryan.crouch@ligo.org — Thu, 05 Mar 2026 10:02:20 -0800

Author: ryan.crouch@ligo.org

Report ID: 89378

Closes FAMIS37262, last checked in alog88698.

Everything looks as expected, no new issues. There was an odd dust spike (10 minutes of >1000 cts, so 2 cycles of sampling) from the PSL102 (Anteroom) dust monitor on Sat Feb 7th around 11:30 local.

Images attached to this report

H1 ISC - Comment to ISCT1 and new JAC table IOT2R in place and bellows attached

corey.gray@ligo.org — Thu, 05 Mar 2026 09:41:42 -0800

Author: corey.gray@ligo.org

Report ID: 89377

tagging EPO

EPO

H1 CDS - h1sush6 front end computer first boot

david.barker@ligo.org — Thu, 05 Mar 2026 09:32:55 -0800

Author: david.barker@ligo.org

Report ID: 89376

Fil, Erik, Dave:

Fil ran the 24V-DC power to the h1sush6 IO Chassis on the MER Wed afternoon and I completed the fiber connections to the rear of the computer in the MSR. Erik and I booted h1sush6 for the first time late Wed afternoon after setting the BIOS and IPMI.

Current hardware status:

computer has Dolphin card installed but not connected to the switch. MTP at the computer end sends 4-Adnaco and 1-timing pairs to the MER via port-3 on the patch.

This is a W2275 14core machine, was cdsproxmox2. Its disks have been removed and it needed a full set of RT BIOS changes.

IO Chassis is "what was left" of h1sush2b after cards were moved over to the new h1sush12 chassis. So it has a mismatch of cards, but each Adnaco has a unique layout which is all that is needed to confirm Adnaco functionality.

A1 [slot1=TC, slot4=18AO8]

A2 [slot1=18AO8,slot2=16AO16]

A3 []

A4 [slot1=BIO]

The computer booted with some difficulty because it was trying to load the non-existent h1iopsush6 model. We were finally able to ssh onto the machine and showcards sees all the cards except A4.

Also the timing card is not syncing, we will investigate that today.

A minor issue, we had some DNS issues on the workstation-LAN which Erik resolved.

LHO General - HVAC Fan Vibrometers FAMIS Check (FAMIS 39857)

corey.gray@ligo.org — Thu, 05 Mar 2026 08:15:59 -0800

Author: corey.gray@ligo.org

Report ID: 89375

For FAMIS #39857: All fan trends look nice and flat.

PEM

Images attached to this report

LHO General - Thurs DAY Ops Transition

corey.gray@ligo.org — Thu, 05 Mar 2026 07:40:55 -0800

Author: corey.gray@ligo.org

Report ID: 89373

TITLE: 03/05 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 10mph Gusts, 7mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.24 μm/s
QUICK SUMMARY:

HAM1 (@4.0e-6) & HAM7 (@2.6e-7) continue to pump down. There has been mention of opening gate valves (5 & 7), but not sure when. CEBEX contractors are out and continue to unload pallets of brick.

H1 TCS - CHETA update

sophie.muusse@ligo.org — Wed, 04 Mar 2026 18:44:08 -0800

Author: sophie.muusse@ligo.org

Report ID: 89372

S. Muusse

The translation and rotation stage issues have been solved with help from patrick and daniel and now all optomechanics and sensors can be accessed and operated through beckhoff!
Dependent on a delivery, the feed throughs and rack should be constructed tomorrow allowing a full test of the electronics on the completed Y table.

Table 2 (X-arm) is almost fully aligned with only the beam dump and visible laser left to install.

H1 CDS - CHETA Field Cabling

filiberto.clara@ligo.org — Wed, 04 Mar 2026 17:18:47 -0800

Author: filiberto.clara@ligo.org

Report ID: 89371

WP 13063

CHETA field cables have been pulled. This includes the picomotor, analog readback, and laser interlock cables.

F. Clara, M. Pirello

AWC

LHO VE - HAM 1 Leak Checking

jordan.vanosky@ligo.org — Wed, 04 Mar 2026 16:48:49 -0800

Author: jordan.vanosky@ligo.org

Report ID: 89370

Travis, Jordan

We were able to leak check the new JAC viewport on the -Y door of HAM1 today. Since this is an o-ring sealed viewport we bagged the viewport leaving the conflat seal exposed before spraying helium, in an attempt to reduce helium diffusion through the o-ring.

With the helium leak detector backing the main turbopump, the helium background was ~4E-10 Torr-l/s. While spraying the flange/leak check ports, the helium signal slowly rose (30-60 seconds) to maximum of ~1E-9 Torr-l/s, typical of permeation through an o-ring, see attached picture.

Once, leak checking was completed, we disconnected the leak detector from the main turbo pump cart, isolated the turbopump from the chamber, and moved the SS500 cart closer to HAM2 to allow room for the new JAC table to be moved into place.

HAM1 continues to be pumped via turbopump, while the annulus volume is still pumping with both the aux carts and the annulus ion pumps.

Images attached to this report

LHO General - Wed DAY Ops Summary

corey.gray@ligo.org — Wed, 04 Mar 2026 16:33:50 -0800

Author: corey.gray@ligo.org

Report ID: 89352

TITLE: 03/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

HAM1 continues to pump down, but we are getting closer to opening gate valves. CEBEX work near MY had several truck loads of bricks (on pallets) put in lay-down areas. Had a couple of tours on-site. HAM1 ISCT1 & new small JAC in-air tables were rolled into place.
LOG:

~1500 semi-trucks (brick deliveries) and contractor vehicle traffic begins for CEBEX
1539-1809 Walkaround lvea (rigging/garb room checks) and possible craning [randy]
1535-1641 LVEA technical cleaning (kim, nellie)
- 1641-1750 EX for supplies and cleaning (kim)
- 1845-1911 EY supply check (kim)
1535 SPI optics lab laser HAZARD work (jeff)
1707-1751 Surveying on backside of Y-arm for cebex (bubba.crew)
1712-1715 grabbing dustmonitor in cer (ryanC)
- 1750-1755 grabbing another dust monitor to test (RyanC)
1717-1800 lvea walkthrough (betsy)
1716-2350 CHETA cable pulling along x-beam manifold and around beer garden (marc.fil)
1720-1730 Isolating ham7 turbo pump (jordan)
1741-2356 HAM1 isi loops work off/on today (jim)
1757-1809 HAM1 Isolating Aux Carts on annulus (jordan)
1815 BSC1 ISI watchdog trips due to severe shaking around BSC1 (also around this time there was an EQ, but this did not affect any other chambers)
- 1820 SWWD bypassed by Dave to prevent DAQKILL of seib1 (alog 89355)
- 1835 Jim went out on the floor to see what was shaking the isi & sus
- 1850 Jim going out to check ISI coil drivers
- 1910 ISI back to isolated
1844 HAM1 leak detector set up (travis, jordan)
1902 Looking for Bellows for optics tables (camilla.betsy)
1906 2nd load of bricks on large truck arrives to offload at MY---these loads are out near the Chiller Yard
- 1944 load arrives on site and went to MY chiller yard
1917-1937 Ki-Be High School Tour in Control Room (maggie)
2043-2312 Forklift prep & ISCT1 + new JAC tables installation (randy)
2043-2101 TCS Chillers biweekly check/fill (corey)
2107 Beckhoff restart (daniel)
2111 ISCT1 rolled back into place (camilla,mitch,randy)
- 2118 betsy joining
2127 BHD work in optics lab (elenna,oli)
2142 CEBEX brick truck leaving site (last one?)
2149-2233 lvea walkabout (richard)
2200-2212 CHETA lab to pick up a rotation stage for slow controls work (sophie)
- 2218 grabbing another one (sophie)
- 2311 returning rotation stages (sophie)
2207 checking on HAM1 work (jenne)
2207 putting stickers on the new little JAC table on the -y of HAM1 (travis)
2208-2312 heading out to HAM1 since -Y side is now clear of VAC equipment (jennie)
2226 Looking for VAC person in lvea for nitrogen air tank for BHD Top Gun work (elenna.oli)
2246-2312 Tour of WSU architecture students (RyanS)
2303 BHD work in optics lab (oli, elenna)
- 2322 Elenna out
2356 MER power up sush7 io chassis (fil,marc)
2356-0026 Checking EX/EY wind fences (jim)
0001 JAC in-air table cable hook up (daniel)

H1 ISC - ISCT1 and new JAC table IOT2R in place and bellows attached

camilla.compton@ligo.org — Wed, 04 Mar 2026 15:39:08 -0800

Author: camilla.compton@ligo.org

Report ID: 89369

Randy, Mitch, Betsy, Camilla, Jenne, Jennie, Richard

ISCT1 was forklifted into place by Randy and the table height checked. The new JAC table, IOT2R, was pushed into place and lifted off it's of it's wheels, height may need to be further adjusted once we start alignment. Bellows were attached. Photos of JAC table attached.

Images attached to this report

LHO EPO - CEBEX Progress pt1

tyler.guidry@ligo.org — Wed, 04 Mar 2026 15:36:56 -0800

Author: tyler.guidry@ligo.org

Report ID: 89368

Surveying for building footprint and water tie-in/routing actuals have been placed, and the masonry sub has begun staging CMU block while we await our grading permit. B. Gateley M. Link T. Guidry

Images attached to this report

H1 SEI - Comment to HAM1 long tfs after JAC and periscope stiffener install

jim.warner@ligo.org — Wed, 04 Mar 2026 15:24:33 -0800

Author: jim.warner@ligo.org

Report ID: 89367

I've touched up the isolation loops, removing the 70hz notches where I could and increased ugfs to more normal levels, from 22hz before to 25-30 hz. This should mostly help below 10hz.

H1 SQZ - Comment to 2W Mid SQZ Data for 5kHz and 10kHz HOM Spacing

sheila.dwyer@ligo.org — Wed, 04 Mar 2026 15:06:42 -0800

Author: sheila.dwyer@ligo.org

Report ID: 89362

At Matt's request I revisited this data.

We didn't plan on doing subtraction on this data at the time we took it, so we didn't save the high rate individual PD time series to do the cross correlation. Instead, I made a rough shot noise model (a line in a semilog plot), subtracted that in quadrature from the no squeezing data to estimate the non quantum noise and subtract that from the squeezing measurements.

Above I wrote that there is only one mode at 5kHz, and one at 10kHz, but after doing the rudimentary subtraction this data does seem to suggest that there are two modes at 10kHz, which we would expect since the ring heater settings are different for the two arms. The rotation that is partially hidden by quantum noise and is around 9875-9900 Hz, and seems to rotate in the opposite direction from the more visible one at 10kHz. (This is different from what was seen at full power in 86107 and in the similar ADF measurements in Kevin's comment).

The code used to make these plots is based on 86107 and is available here.

Note: The pink trace in this plot is labeled anti-squeeze, but it is not, it is actually a mid squeezing angle that is somewhat close to anti-squeezing.

Non-image files attached to this report

HOM_data_ADC_counts_2W.pdf

H1 TCS - TCS Chiller Water Level Top-Off (Bi-Weekly, FAMIS #28557)

corey.gray@ligo.org — Wed, 04 Mar 2026 14:39:49 -0800

Author: corey.gray@ligo.org

Report ID: 89365

Addressed TCS Chillers (Wed [Mar4] 1242-0105pm local time) & CLOSED FAMIS #28557. (Last checked 89168)

TCSx Chiller: Had level of 30.1 cm. Added 200mL for 30.7cm.
TCSy Chiller*: Had level of 10.0 cm. Added 60mL for 10.6cm.
There was no water in the small cup under the slow leak.

* When filling the TCSy chiller noticed that inside the mesh filter, part of the white mesh was folded up (see here). So, I folded it down to make it look "normal" (see here). But after this the water level dropped about "0.6cm", so I needed to add some more water (total water added is the 60mL listed above).

TCS

Images attached to this report

H1 DAQ - Comment to Slow Controls Upgrade

david.barker@ligo.org — Wed, 04 Mar 2026 14:36:14 -0800

Author: david.barker@ligo.org

Report ID: 89366

Updated the slowcontrols SDF for h1syscs[aux,isc,tcs]sdf, restarted these processes on h1ecatmon0 and accepted+monitored the new not-init channels.

The update revealed that there are 12 CS AUX channels which are pending to be added to the DAQ (H1EPICS_ECATAUXCS.ini).

+[H1:SYS-MOTION_C_PZTSHUTTER_B_COUNT]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_ERROR_CODE]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_ERROR_FLAG]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_HIGH]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_LIMITS]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_LOW]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_NULL]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_RANGE]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_STATE]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_TRIG]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_VOLTS]

H1 IOO - TRANS PD calibration

masayuki.nakano@ligo.org — Wed, 04 Mar 2026 14:31:26 -0800

Author: masayuki.nakano@ligo.org

Report ID: 89364

[Jennie, Masayuki]

Using the power measurement by Jennie et al. on Feb 24, I calibrated the TRANS PD.

Channels used:
• H1:JAC-TRANS_A_DC_DCCURRENT (Beckhoff)
• H1:JAC-TRANS_A_LF_INMON (fast)

Offset was difficult to estimate, so it was assumed to be zero.

With 1 W input from the IMC, the signals were
• 0.00185 A (Beckhoff)
• 261.2 counts (fast)

According to Jennie’s alog, the power on the PD was 37 µW, giving a responsivity of

37uW/0.00185A ~ 0.02 W/A

Using HAM1 output = 96 mW for 100 mW JAC input, the effective pick-off reflectivity is

37uW/(96mW*10)= 38.5ppm

Accounting for the mW→W conversion factor (×1000), the effective pick-off fraction is ~3.85(%).

IOO

H1 DAQ - Slow Controls Upgrade

daniel.sigg@ligo.org — Wed, 04 Mar 2026 13:13:26 -0800

Author: daniel.sigg@ligo.org

Report ID: 89363

Restarted the slow controls system to fix an issue with the CHETA motor stages.

H1 SEI - Comment to HAM1 long tfs after JAC and periscope stiffener install

jim.warner@ligo.org — Wed, 04 Mar 2026 12:25:28 -0800

Author: jim.warner@ligo.org

Report ID: 89361

These are the gs13 c2c tfs. First image is the data from last night, second image is the data from last year. Similar story, the new tfs look a little easier to wrap loops around, but the 170hz feature will require some notching. There is also still some feature at 75hz in the X and Z dofs. Hmm.

Images attached to this report

H1 SEI - HAM1 long tfs after JAC and periscope stiffener install

jim.warner@ligo.org — Wed, 04 Mar 2026 12:08:57 -0800

Author: jim.warner@ligo.org

Report ID: 89360

I took the .5-800hz tfs last night on HAM1 ISI, to see if the 70hz feature was improved by the periscope brace. Short version, it has been and I now see the ~170hz that I measure here. There's also a feature at ~102hz that could be a number of things, but I didn't see that in the B&K measurement of the periscope+stiffener.

First attached image are the L2L gs13 tfs I took last night. Data below .5hz is from measurements I took last year, I don't expect those to have changed. Above .5hz is new data. These new measurements were taken with HEPI locked, so features around the pier modes at 15hz might not be permanent. I might also get better resolution above 200hz when the pumpdown is done and it's a little quieter at the chamber.

Second image are the data from last year, after adding the viton to the periscope dog clamps. That viton is still in place, but we now also have the stiffener added, so the sharp feature at 70hz is now moved to 170hz.

Third and fourth images are the CPS tfs. These are harder to compare because HEPI was unlocked for the fourth image (june 2025 tf) and locked for the third (last night).

I will post C2C tfs when I get there. Hope to see if I can increase the loop gain on HAM1 with the 70hz feature gone, we'll see.

Images attached to this report

H1 PEM - BSC2 dust mon trend

ryan.crouch@ligo.org — Wed, 04 Mar 2026 11:54:52 -0800

Author: ryan.crouch@ligo.org

Report ID: 89359

I ran a trend of the BSC2 dust monitor (LVEA10) since its been moved to the platform (alog89137).

Images attached to this report

H1 TCS - TCS Monthly Trends (FAMIS #38838)

corey.gray@ligo.org — Wed, 04 Mar 2026 11:49:53 -0800

Author: corey.gray@ligo.org

Report ID: 89358

Attached are monthly TCS trends for HWS & CO2 lasers. (FAMIS link)

TCS

Images attached to this report

H1 CDS - Comment to SWWD bypass BSC1 (ITMY) seismic, suspension shaking because of earthquake

jim.warner@ligo.org — Wed, 04 Mar 2026 11:11:54 -0800

Author: jim.warner@ligo.org

Report ID: 89357

Not sure what was happening here, but it was not just the earthquake ringing up the sus. HWWD killed the ISI coildrivers, the sus continued to shake bad enough it was saturating all of the ISI seismometers for several minutes. I had to turn on off the sus damping, let the quad calm down, go reset the HWWD and ISI coil drivers before the ISI stopped shaking. When I went to the CER, I found all of the ISI coil drivers powered off. I reset the HWWD on the sus rack, then power cycled the ISI coil drivers to get them back on. Quad and ISI have both calmed down, damping is back on, Corey is slowly bringing the ISI back up. Unclear if there was cable pulling in the area that caused this, coincident with the earthquake.

SEI

H1 CDS - Comment to SWWD bypass BSC1 (ITMY) seismic, suspension shaking because of earthquake

david.barker@ligo.org — Wed, 04 Mar 2026 10:32:55 -0800

Author: david.barker@ligo.org

Report ID: 89356

Note that ITMY is the only SWWD which is ringing up.

Images attached to this report

H1 CDS - SWWD bypass BSC1 (ITMY) seismic, suspension shaking because of earthquake

david.barker@ligo.org — Wed, 04 Mar 2026 10:22:45 -0800

Author: david.barker@ligo.org

Report ID: 89355

Ongoing earthquake is shaking ITMY to a point where its SWWD was going to DACKILL seib1, I've bypassed both SEI and SUS for now.

Images attached to this report

LHO VE - Wed CP1 Fill. HAM1 added back to VACSTAT

david.barker@ligo.org — Wed, 04 Mar 2026 10:15:13 -0800

Author: david.barker@ligo.org

Report ID: 89354

Wed Mar 04 10:09:48 2026 INFO: Fill completed in 9min 45secs

On an unrelated note, now that HAM1's pressure is steady and in range I have re-enabled it in VACSTAT.

Images attached to this report

H1 PSL - Comment to PSL Status Report Weekly FAMIS 39754

jason.oberling@ligo.org — Wed, 04 Mar 2026 09:43:18 -0800

Author: jason.oberling@ligo.org

Report ID: 89353

PSL stabilization systems were shut down for Fil's PMC and JAC PZT power supply work (alog 89349). Work was completed in the late morning and all PSL systems turned back on, everything is working as it should.

LHO General - Wed DAY Ops Transition

corey.gray@ligo.org — Wed, 04 Mar 2026 07:40:49 -0800

Author: corey.gray@ligo.org

Report ID: 89351

TITLE: 03/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 13mph Gusts, 10mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.15 μm/s
QUICK SUMMARY:

HAM1 continues to pump down (6.4e-6torr). Brick deliveries to MY and other work for CEBEX have already started this morning. LVEA is laser SAFE.

H1 CDS - Comment to h1susauxh8 model merged into h1susfc2

david.barker@ligo.org — Wed, 04 Mar 2026 07:31:22 -0800

Author: david.barker@ligo.org

Report ID: 89350

To complete the removal of h1susauxh8 I regenerated the various MEDMs with model lists, e.g. IPC, RCG-ver, load-times and sdf-ref.

H1 CDS - HAM1 / PSL High Voltage Supplies

filiberto.clara@ligo.org — Tue, 03 Mar 2026 17:10:28 -0800

Author: filiberto.clara@ligo.org

Report ID: 89349

WP 12956

The PSL PMC HV (375V) Kepco power supply in the CER mezzanine was replaced with two Mid Eastern power supplies. The first power supply provides power to the HAM1 PZT (350V). Output is enabled by a vacuum gauge interlock. The second power supply provides power to the PSL PMC (375V), no interlock.

LHO General - Ops Day Shift Summary

ryan.short@ligo.org — Tue, 03 Mar 2026 16:31:00 -0800

Author: ryan.short@ligo.org

Report ID: 89348

TITLE: 03/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM1 main volume is pumping down. Cables were staged in the LVEA, HAM1 SUS transfer functions were taken, and the Guardian machine was rebooted as well today.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:58	FAC	Randy	LVEA	N	Prep for cleanroom move	17:37
16:10	FAC	Chris, Pest Ctrl	LVEA, Outbldgs	N	Pest control	20:10
16:24	VAC	Jordan	LVEA	N	Restart HAM1 pumpdown	17:44
16:36	FAC	Jim, Tony	LVEA	N	Cleanroom move	17:37
16:56	FAC	Richard	LVEA	N	Cleanroom move	17:31
16:58	EE	Fil	LVEA	N	Pictures of electronics	17:22
16:59	FAC	Tyler	LVEA	N	Cleanroom move	18:39
17:22	PSL	Fil, Jason	LVEA	N	PMC/JAC electronics	19:04
17:24	PSL	Marc	LVEA	N	PMC/JAC electronics	19:08
17:24	SUS	Oli	CR	N	HAM1 SUS TFs	19:30
17:39	VAC	Gerardo	LVEA	N	HAM1 pumpdown	17:44
18:17	FAC	Randy	LVEA	N	Craning scissor lift	19:04
18:36	SPI	Corey	Opt Lab	N	Inspecting optics	19:04
18:39	FAC	Tyler	LVEA	N	Checks in biergarten	19:04
19:16	VAC	Jordan	LVEA	N	Shut down pump cart at HAM7	19:40
19:19	VAC	Gerardo	LVEA	N	HAM1 pumpdown	19:40
19:28	JAC	Jason	Opt Lab	N	Inspecting optics	20:02
20:01	TCS	Camilla, Sophie	Prep Lab	N	Checking electronics	20:28
20:27	FAC	Randy	LVEA	N	Changing out cleanroom bolts	21:11
20:51	VAC	Travis	MX, MY	N	Retrieving parts	21:42
21:17	TCS	Sophie	Opt Lab	N	Retrieving a driver	21:23
21:33	EE	Fil, Marc	LVEA	N	Pulling CHETA cables	Ongoing
21:35	TCS	Sophie	Prep Lab	N	Re-retrieving driver	21:42
22:01	TCS	Sophie	Prep Lab	N	Dropping off a driver	22:01
23:07	TCS	Camilla	LVEA	N	Consulting on cable pulling	23:20
23:53	VAC	Travis	LVEA	N	Dropping off parts	00:10
00:20	TCS	Sophie	Prep Lab	N	Re-dropping off a driver	00:26
00:25	VAC	Jordan	LVEA	N	Checking HAM1 pump cart	Ongoing

H1 CDS - Comment to h1susauxh8 model merged into h1susfc2

erik.vonreis@ligo.org — Tue, 03 Mar 2026 15:04:40 -0800

Author: erik.vonreis@ligo.org

Report ID: 89347

NDS1 restart was caused by 1 second of missed data. Incoming data skipped from 1456605821 cycle 15 to 1456605823 cycle 0. The daqd log is below.

Mar 03 12:43:25 h1daqnds1 daqd[1470118]: Dropped data from shmem or received 0 dcus; gps now = 1456605823, 0; was = 1456605821, 15; dcu count = 124 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: expected gps = 1456605822 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: expected cycle = 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: expected nano = 62500015 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: first 20 dcuids seen Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 38 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 31 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 39 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 40 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 41 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 170 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 171 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 107 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 108 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 43 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 45 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 44 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 46 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 22 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 166 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 167 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 168 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 169 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 174 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: saw dcu 122 - gps: 1456605823 nano: 0 cycle: 0 Mar 03 12:43:25 h1daqnds1 daqd[1470118]: [Tue Mar 3 12:43:25 2026] ->3: start trend 60 net-writer 1456605420 60 {"H0:FMC-CS_LVEA_ZONE2B_G_DEGC.min" "H0:FMC-CS_LVEA_ZONE2B_G_DEGC.max" "H0:FMC-CS_LVEA_ZONE3A_F_DEGC.mean" "H0:FMC-CS_LVEA_ZONE3A_F_DEGC.rms" "H0:FMC-CS_LVEA_ZONE3A_F_D> Mar 03 12:43:25 h1daqnds1 daqd[1470118]: [Tue Mar 3 12:43:25 2026] connection closed on fd=35 Mar 03 12:43:28 h1daqnds1 systemd[1]: rts-daqd.service: Main process exited, code=killed, status=11/SEGV Mar 03 12:43:28 h1daqnds1 systemd[1]: rts-daqd.service: Failed with result 'signal'.

H1 CDS - Comment to h1susauxh8 model merged into h1susfc2

david.barker@ligo.org — Tue, 03 Mar 2026 15:00:38 -0800

Author: david.barker@ligo.org

Report ID: 89346

h1susfc2 DAQ data rate increased from 300kB to 500kB per second. Processing time increased by 1uS to 17uS (out of 60uS).

H1 CDS - h1susauxh8 model merged into h1susfc2

david.barker@ligo.org — Tue, 03 Mar 2026 14:51:36 -0800

Author: david.barker@ligo.org

Report ID: 89345

WP13042

Jonathan, Erik, EJ, Ryan S, Dave:

This morning we merged the h1susauxh8 model into h1susfc2. This frees up a core such that when the ethernet IPC is installed we will still have 2 free cores for non-rt.

As was done previously when Jeff installed the HAM1 JC[1,3] aux on the h1susham1 model, the AUX parts were installed at the top level of h1susfc2 with underscores in their names (FC2_M1, FC2_M2, FC2_M3) which passes the simulink naming rules and preserves the H1:SUS-FC2_Mx_ channel names.

Also as was found with the HAM1 model, the first attempt to build failed because of duplicate MUX and DEMUX part names between the main model and the aux library models. For example FC2_M1_Mux1 in the control's library block and the AUX's library block. The solution, as had been done previously, was to edit the common library model and rename the MUX and DEMUX parts. Previously we had made up a number, e.g. 100. This time I got the number from today's date, e.g. Mux260303, to ensure uniqueness.

Files modifed for the new h1susfc2:

"path": "sus/h1/models/h1susfc2.mdl",
"svn_rev": 34641,
"path": "sus/common/models/SIXOSEM_T_STAGE_MONITOR_MASTER.mdl",
"svn_rev": 34642,
"path": "sus/common/models/FOUROSEM_STAGE_MONITOR_MASTER.mdl",
"svn_rev": 34642,
Prior to the restarts I verified that the fast and slow channels to be added to h1susfc2 were identical to the existing channels on h1susauxh8 (28 fast, 496 slow). In addition, slow channels associated with the two ADCs used by AUX were accounted for.

Erik made the puppet changes to remove h1susauxh8 from CDS. He also removed it from the testpoint.par file.

Initially we were going to restart the EDC as part of the DAQ restart to move its DAQ send timing to see if we could fix the h1susb13 DAQ 1-leg CRC issues which started last Tuesday. We quickly realized we actually needed an EDC restart to remove the FEC-172 and DAQ SUSAUXH8 channels.

The model change was made with the sequence:

stop all models on h1cdsh8 and fence it from Dolphin

reboot h1cdsh8, new h1susfc2 installed and h1susauxh8 completely removed.

It was at this point we realized the EDC needed an edit for FEC-172 removal. This took longer than anticipated because of a mismatch between old and new DAQ meant python scripts kept installing the aux, so hand editing was needed but at one point puppet undid that. Long story short, it took several rounds of restarts to get the EDC correct.

The DAQ was restarted, and this was also pretty messy. FW1 restarted itself several times, and strangely NDS1 restarted itself after 40minutes of running. We don't think we had seen this before.

Once the system was stable I wrote a python script to 'activate' the AUX filtermodules to pass the signal through to the OUT_DQ channels. I then trended the 28 DQ channels spanning from when they were on h1susauxh8 to now they are on h1susfc2 to verify they are the same signals, they are.

I updated DAQSTAT to expect 124 dcuids (was 125).

H1 SEI - Comment to ISIJ (HAM2) SPI reflector completed in Optics lab

corey.gray@ligo.org — Tue, 03 Mar 2026 14:44:20 -0800

Author: corey.gray@ligo.org

Report ID: 89344

Tagging for EPO photos

EPO

H1 SUS - Comment to PM1 LR BOSEM swapped in, and other HAM1 closeout work

corey.gray@ligo.org — Tue, 03 Mar 2026 14:37:03 -0800

Author: corey.gray@ligo.org

Report ID: 89343

Tagging for EPO photos

EPO

H1 IOO - Comment to JAC monday

corey.gray@ligo.org — Tue, 03 Mar 2026 14:28:46 -0800

Author: corey.gray@ligo.org

Report ID: 89342

Tagging for EPO photos

EPO

LHO VE - Comment to HAM4 Annulus Ion Pump Replacement

corey.gray@ligo.org — Tue, 03 Mar 2026 14:19:51 -0800

Author: corey.gray@ligo.org

Report ID: 89341

Tagging for EPO photos

EPO

H1 IOO - Comment to JAC work today

corey.gray@ligo.org — Tue, 03 Mar 2026 14:16:36 -0800

Author: corey.gray@ligo.org

Report ID: 89340

Tagging for EPO photos

EPO

H1 IOO - Comment to Put on viewport simulator and rolled up IOT1

corey.gray@ligo.org — Tue, 03 Mar 2026 14:06:52 -0800

Author: corey.gray@ligo.org

Report ID: 89339

Tagging for EPO photos

EPO

H1 SUS - HAM1 SUS TFs now that we're in vacuum

oli.patane@ligo.org — Tue, 03 Mar 2026 11:49:16 -0800

Author: oli.patane@ligo.org

Report ID: 89337

Took transfer functions for the suspensions in HAM1 since they're now in a state where they're not being affected by air anymore. They're all looking good. RM1 and RM2 are flipped in phase, but they've been like that (84543).

Settings: - ISI DAMPED - DAMP OFF - OPTICALIGN OFFSETS OFF

JM1 Data: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM1/SAGM1/Data/2026-03-03_1730_H1SUSJM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml Results: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM1/Results/2026-03-03_1730_H1SUSJM1_M1_ALL_TFs.pdf r12929

JM3 Data: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/SAGM1/Data/2026-03-03_1800_H1SUSJM3_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml Results: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/Results/2026-03-03_1800_H1SUSJM3_M1_ALL_TFs.pdf r12930

PM1 Data: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Data/2026-03-03_1840_H1SUSPM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/Results/2026-03-03_1840_H1SUSPM1_M1_ALL_TFs.pdf
r12931

RM1 Data: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM1/SAGM1/Data/2026-03-03_1855_H1SUSRM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml Results: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM1/Results/2026-03-03_1855_H1SUSRM1_M1_ALL_TFs.pdf r12933

RM2 Data: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM2/SAGM1/Data/2026-03-03_1910_H1SUSRM2_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml Results: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM2/Results/2026-03-03_1910_H1SUSRM2_M1_ALL_TFs.pdf r12935

Comparison Results: /ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2026-03-03_HAM1_BackinVac_ALL_TFs.pdf r12936

Non-image files attached to this report

2026-03-03_1730_H1SUSJM1_M1_ALL_TFs.pdf

2026-03-03_1800_H1SUSJM3_M1_ALL_TFs.pdf

2026-03-03_1840_H1SUSPM1_M1_ALL_TFs.pdf

2026-03-03_1855_H1SUSRM1_M1_ALL_TFs.pdf

2026-03-03_1910_H1SUSRM2_M1_ALL_TFs.pdf

allhttss_2026-03-03_HAM1_BackinVac_ALL_TFs.pdf

H1 SEI - ISIJ (HAM2) SPI reflector completed in Optics lab

jim.warner@ligo.org — Tue, 03 Mar 2026 11:41:53 -0800

Author: jim.warner@ligo.org

Report ID: 89338

This week, in the optics lab flow bench, I started doing the assembly of the ISIJ SPI reflector assembly. There were a few stumbles, the biggest being a custom peek retaining ring that looks very similar to an incompatible catalog part that got mixed in with the JAC stuff. Once that was found, the reflector assembly more or less went together as described in Sheon's procedure, T2500318. I think the only thing missing is an accuglass cable clamp, but we can add this later or come up with a zip tie to capture the cable.

First photo is the is the reflector assembly itself. This is where I finished yesterday. Second, third and fourth images are the reflector assembly with the shroud attached. Jeff said we may not use this, but it will provide some protection for the time being.

Fifth, sixth and seventh images are the information I have for the lens, beamsplitter and QPD.

SPI

Images attached to this report

LHO VE - Tue CP1 Fill

david.barker@ligo.org — Tue, 03 Mar 2026 10:40:27 -0800

Author: david.barker@ligo.org

Report ID: 89336

Tue Mar 03 10:08:36 2026 INFO: Fill completed in 8min 33secs

Images attached to this report

H1 PSL - PSL Status Report Weekly FAMIS 39754

ryan.crouch@ligo.org — Tue, 03 Mar 2026 09:56:45 -0800

Author: ryan.crouch@ligo.org

Report ID: 89335

Laser Status:
NPRO output power is 1.84W
AMP1 output power is 70.39W
AMP2 output power is 138.9W
NPRO watchdog is GREEN
AMP1 watchdog is GREEN
AMP2 watchdog is GREEN
PDWD watchdog is GREEN

PMC:
It has been locked 0 days, 0 hr 0 minutes
Reflected power = -0.4136W
Transmitted power = -0.02846W
PowerSum = -0.4424W

FSS:
It has been locked for 0 days 0 hr and 0 min
TPD[V] = 0.003508V

ISS:
The diffracted power is around 4.1%
Last saturation event was 0 days 0 hours and 36 minutes ago

Possible Issues:
FSS TPD is low (dropped at ~1710 UTC today)

Images attached to this report

H1 CDS - Comment to Guardian rebooted

ryan.short@ligo.org — Tue, 03 Mar 2026 08:28:47 -0800

Author: ryan.short@ligo.org

Report ID: 89334

After the reboot, there were a handfull of nodes I requested to different states:

IMC_LOCK -> OFFLINE
SEI_ENV -> MAINTENANCE
SEI_BS -> ISI_DAMPED_HEPI_OFFLINE
IFO_NOTIFY -> IDLE
PEM_MAG_INJ -> DOWN
SUS_CHARGE -> DOWN
All SUS nodes -> their requested state (this just "greens up" the nodes since they have no initial request, but the suspensions were all still in their correct mis/alignments)

All other nodes I left either to their initial requests or INIT, which is how they come up by default.

LHO General - Comment to Ops Day Shift Start

david.barker@ligo.org — Tue, 03 Mar 2026 08:27:42 -0800

Author: david.barker@ligo.org

Report ID: 89333

ham1 trend

Images attached to this report

H1 CDS - Guardian rebooted

david.barker@ligo.org — Tue, 03 Mar 2026 08:21:21 -0800

Author: david.barker@ligo.org

Report ID: 89329

WP13054 h1guardian1 reboot

Ryan S, Dave:

At 07:59 PST we rebooted h1guardian1. This was a maintenance reboot, it had been running for 74 days (since 19dec2025). No changes to the OS were made.

18 nodes had been pending loading the modified ISC_library.py common file. Ryan had checked that none of these nodes were using the modified section of this file.

There were no problems with the reboot and restart of the 176 guardian nodes.

ALIGN_IFO NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:12 Fri 19dec2025
ALS_COMM NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
ALS_DIFF NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
ALS_XARM NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:12 Fri 19dec2025
ALS_YARM NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
CAMERA_SERVO NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
H1_MANAGER NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:34 Fri 19dec2025
INIT_ALIGN NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
ISC_DRMI NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:12 Fri 19dec2025
ISC_LOCK NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:12 Fri 19dec2025
LASER_PWR NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
OMC_LOCK NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:12 Fri 19dec2025
SEI_CONF NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
SEI_ENV NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:12 Fri 19dec2025
SQZ_FC NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
SQZ_MANAGER NOT LOADED ISC_library.py 13:08 Tue 24feb2026 09:21 Tue 23dec2025
TMS_SERVO NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025
VIOLIN_DAMPING NOT LOADED ISC_library.py 13:08 Tue 24feb2026 13:11 Fri 19dec2025

Images attached to this report

LHO General - Ops Day Shift Start

ryan.short@ligo.org — Tue, 03 Mar 2026 07:34:21 -0800

Author: ryan.short@ligo.org

Report ID: 89328

TITLE: 03/03 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 7mph Gusts, 4mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.15 μm/s
QUICK SUMMARY: HAM1 pumpdown had to be stopped last night and will be restarted this morning. Cable pulling, cleanroom moves, and a reboot of the Guardian machine are also planned for today.

H1 AOS - Workstations updated

erik.vonreis@ligo.org — Tue, 03 Mar 2026 05:24:31 -0800

Author: erik.vonreis@ligo.org

Report ID: 89327

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

CDS

LHO VE - HAM1 Pump Down

gerardo.moreno@ligo.org — Tue, 03 Mar 2026 00:20:08 -0800

Author: gerardo.moreno@ligo.org

Report ID: 89326

(Travis S., Gerardo M.)
Pumpdown was started this morning, sorry no blowdown data. By the time I remembered to take the reading there was no more pressure inside the chamber. Travis connected all of the equipment while I wrestled with the viewport inspection.
Pumpdown was started without an issue. We started with the scroll pump from the super sucker 500, the scroll pump of the SS500 cart brought the pressure down to 3.7x10-01 Torr, then we switched the cart to start pumping with the turbo pump/scroll pump. We had one trip of the system, usually due to a time out, but it only took a restart of the turbo pump and the pumpdown to continue.
Unfortunately the pumpdown had to be stopped at 8:00 PM local time, with a pressure of 4.0x10^-05 Torr, at that pressure the set points had not activated on the SS500 cart controller, the set points are hard set and can't be modified from the SS500 controller screen.
Pumpdown will be restarted tomorrow morning.

Note, on the attachment, regarding the screens, no set points for channel 1.

Images attached to this report

H1 CDS - WP 13002 Migrate services to the new VM cluster continued

jonathan.hanks@ligo.org — Mon, 02 Mar 2026 18:04:15 -0800

Author: jonathan.hanks@ligo.org

Report ID: 89325

We migrated the last system to the new VM cluster and powered down cdsproxmox0, cdsproxmox1, cdsproxmox2, cdsfs0 cdsfs1.

Cdsfs0, cdsfs1 have been moved into the DTS to become part of a cluster there along with the old commvault machine.

cdsproxmox2 was a spare w2275 and Dave will be using that to support some of the upcoming work.

I'll close the work permit tomorrow after we pull cdsproxmox0 & 1 from the racks.

LHO General - Ops Day Shift Summary

ryan.short@ligo.org — Mon, 02 Mar 2026 16:30:41 -0800

Author: ryan.short@ligo.org

Report ID: 89324

TITLE: 03/03 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM1's main volume is pumping down nicely as of this morning. Cable pulling and parts cleanup also took place out in the LVEA.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:38	FAC	Randy	LVEA	N	Changing HAM1 cleanroom bolts	16:02
15:39	VAC	Richard	LVEA	N	Checking HAM1 annulus	15:41
15:53	FAC	Kim, Nellie	LVEA	N	Technical cleaning	17:30
16:55	EE	Jackie	LVEA	N	Pulling chassis from SUS-R7	17:02
16:55	VAC	Travis	LVEA	N	HAM1 pumpdown	19:30
17:22	FAC	Nellie	EY	N	Technical cleaning	18:07
17:37	FAC	Kim	EX	N	Technical cleaning	18:38
17:47	ISC	Jennie, Masayuki	LVEA	N	Parts cleanup at HAM6	18:42
17:57	VAC	Gerardo	LVEA	N	HAM1 pumpdown	19:31
18:11	ISC	Elenna, Oli	Optics Lab	N	BHD optics build (Elenna out @ 18:54)	19:59
18:51	SAF	Richard	LVEA	N	Checking on HAM1	19:10
20:35	SPI	Jeff	Opt Lab	N	Taking pictures	23:01
20:37	FAC	Richard	LVEA	N	Rebooting PSL environment controller	21:10
20:42	FAC	Randy	LVEA	N	Plugging in scissor lifts	21:15
20:46	ISC	Elenna, Oli	Opt Lab	N	BHD optics build	23:42
20:53	AOS	Betsy	LVEA	N	Putting away parts	21:18
21:24	ISC	Jennie	LVEA	N	Parts cleanup at HAM6	21:43
21:29	EE	Fil, Marc	LVEA	N	Pulling cables	21:39
21:30	ISC	Camilla	Opt Lab	N	Looking at parts	21:57
21:51	AOS	Mitchell	EX, EY	N	FAMIS checks	22:32
21:57	AOS	Betsy	Opt Lab	N	Checking parts	22:57
21:57	VAC	Gerardo, Travis	LVEA	N	HAM1 pumpdown	Ongoing
22:39	EE	Fil	EY	N	Grabbing power supplies	23:38
22:44	SAF	Richard	LVEA	N	Looking for Travis	22:52
23:39	EE	Marc, Fil	LVEA	N	Pulling cables	Ongoing
23:51	ISC	Betsy, Jennie	LVEA	N	Looking at parts at HAM6	00:05
00:06	ISC	Elenna, Oli	Opt Lab	N	BHD optics build	Ongoing

X1 SUS - Comment to BBSS Put in Can

ibrahim.abouelfettouh@ligo.org — Mon, 02 Mar 2026 15:10:11 -0800

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 89323

Ibrahim, Randy

Randy and I opened the can to:

Take out BRDs - were left in but best to remove during the move to OSB and craning since they're somewhat fragile and can swing.
Insert D2300392 Transport Pads under Dummy - for safety during big move
Insert brackets to secure attachment between transport plate (attached to Lower Structure) and can.

See pictures below for each and another overall image.

We then buttoned the BBSS and tightened all screws. It is now ready for transport.

Images attached to this report

H1 PSL - PSL 10-Day Trends

ryan.short@ligo.org — Mon, 02 Mar 2026 13:06:58 -0800

Author: ryan.short@ligo.org

Report ID: 89322

FAMIS 31127

Jason made a brief trip into the enclosure 4 days ago, which is seen in the usual places. Also, the differential pressure between the laser room and anteroom changed around that time. Nothing much else to report this week.

Images attached to this report

H1 CDS - Comment to CHETA slow controls chassis now connected to MSR chassis by copper the whole length

daniel.sigg@ligo.org — Mon, 02 Mar 2026 09:38:27 -0800

Author: daniel.sigg@ligo.org

Report ID: 89321

EtherCAT terminals do not have MAC addresses. Typically, the network adapter sends an Ethernet frame with its own Ether type that will flow through all terminals without being absorbed. Terminals will just read or write individual bits and bytes of this frame as it passes by, and eventually this frame will be reflected back to the adapter. This is called EtherCAT direct mode and has very good latency characteristics, but it is not comaptible with an IP based infrastructure.

LHO General - Ops Day Shift Start

ryan.short@ligo.org — Mon, 02 Mar 2026 07:38:54 -0800

Author: ryan.short@ligo.org

Report ID: 89320

TITLE: 03/02 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 3mph Gusts, 0mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.14 μm/s
QUICK SUMMARY: The HAM1 annulus has been pumping over the weekend, and if that's reached a low enough pressure, then pumping can start on the HAM1 main volume today. A few decent-sized earthquakes rolled through overnight as well.

LHO VE - Sun CP1 fill

david.barker@ligo.org — Sun, 01 Mar 2026 10:23:05 -0800

Author: david.barker@ligo.org

Report ID: 89319

Sun Mar 01 10:09:25 2026 INFO: Fill completed in 9min 21secs

Images attached to this report

LHO VE - Sat CP1 Fill

david.barker@ligo.org — Sat, 28 Feb 2026 10:12:38 -0800

Author: david.barker@ligo.org

Report ID: 89318

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

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H1 CDS - Comment to CHETA slow controls chassis now connected to MSR chassis by copper the whole length

david.barker@ligo.org — Sat, 28 Feb 2026 08:58:12 -0800

Author: david.barker@ligo.org

Report ID: 89317

Initial reports suggest the 6-hourly drop outs of sw-cur-aux-stk has been fixed by this move.