aLIGO LHO Logbook

LHO General

ryan.short@LIGO.ORG - posted 16:32, Tuesday 19 May 2026 (90284)

Ops Day Shift Summary

TITLE: 05/19 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: More alignment work in HAM2 and BBSS alignment today. Now that the LVEA is back to Laser SAFE, more alignment steps for the BBSS and prep for the GV7 repair can be done starting tomorrow. The SPI NPRO continues to run overnight in the optics lab with proper curtains and signage in place.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
19:43	SAF	LASER HAZARD	LVEA	YES	LVEA IS LASER HAZARD	23:11
14:43	FAC	Kim	LVEA	-	Technical cleaning	16:15
15:37	SUS	Betsy	LVEA	-	Looking for parts	15:51
15:49	VAC	Jordan	LVEA	-	Pump checks	15:56
15:49	SUS	Ibrahim	LVEA	-	BBSS staging	19:32
16:20	SUS	Betsy	LVEA	-	BBSS staging	17:47
16:30	PEM	Ryan C	LVEA	-	Setting up DM at test stand	16:46
16:34	FAC	Kim	LVEA	-	Technical cleaning	17:21
17:41	VAC	Jordan +1	EX, MX, EY, MY	-	N2 tank inspections	20:22
17:52	SUS	Betsy	LVEA	-	BBSS staging	19:33
18:31	SUS	Oli	LVEA/Opt Lab	-	Grabbing parts and delivering	19:29
19:29	SPI	Josh	LVEA	-	Checking cable	19:37
20:26	VAC	Travis	LVEA	-	HAM3 feedthrus	21:23
20:28	SUS	Betsy	LVEA	-	BBSS work	22:48
20:29	IAS	Jason, Ryan C	LVEA	-	BBSS surveying setup	22:48
20:33	SUS	Corey	Opt/Prep Labs	-	Looking for parts	20:58
20:35	SEI	Jim	LVEA	-	HAM3 feedthrus	21:24
20:46	SAF	Richard	LVEA	-	Safety checks	21:15
20:48	ISC	Keita	LVEA	Y	HAM2 beam alignment	22:53
20:52	ISC	Elenna	LVEA	Y	HAM2 beam alignment	22:53
20:54	SEI	Shoshana	LVEA	-	HAM3 feedthrus	21:24
21:06	SPI	Jeff	Opt Lab	Local	SPI alignment (working late)	Ongoing
21:18	EE	Fil	MER	-	HEPI electronics	23:18
21:33	CAL	Tony	PCal Lab	Local	Set up measurement	22:32
21:33	SUS	Ibrahim	LVEA	-	BBSS work	22:35
22:21	SEI	Jim	LVEA	-	Getting boxes from H2 PSL	22:27
22:58	SAF	Oli	LVEA	-	Transitioning to Laser SAFE	23:10

LHO General

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ryan.short@LIGO.ORG - posted 07:41, Tuesday 19 May 2026 (90276)

Ops Day Shift Start

TITLE: 05/19 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: 4mph Gusts, 1mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.19 μm/s
QUICK SUMMARY: No alarms overnight, temperatures and dust counts looking normal. More alignment work in HAM2 planned for today along with continued prep on the BBSS in the LVEA west bay. CR workstations and wall FOMs are finishing their restarts.

LHO General

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ryan.short@LIGO.ORG - posted 16:33, Monday 18 May 2026 (90271)

Ops Day Shift Summary

TITLE: 05/18 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Alignment work continued in HAM2 today, along with more prep of the BBSS and IAS surveying on the test stand. Since SPI alignment is ongoing on the optics lab, the laser remains on and running unattended with appropriate barriers and signage up.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
19:43	SAF	LASER HAZARD	LVEA	YES	LVEA IS LASER HAZARD	Ongoing
14:50	FAC	Kim	LVEA	-	Technical cleaning	16:09
15:19	VAC	Jordan	LVEA	-	Pump checks	15:26
15:55	FAC	Randy, Jeff	LVEA	-	Moving IOT2L a little	16:16
15:55	SPI	Jeff	Opt Lab	Local	SPI prep	18:28
16:29	IAS	Jason, Ryan C	LVEA	-	BS FARO surveying	19:55
16:30	ISC	Keita	LVEA	-	Opening lightpipe	16:44
16:46	SUS	Betsy, Ibrahim	LVEA	-	BBSS work	18:34
16:52	TCS	TJ	LVEA	-	Checking on TCSY water lines	17:10
17:09	SUS	Randy	LVEA	-	BBSS work	20:09
17:18	SPI	Josh	LVEA	-	SPI work at SUS-R2	18:32
18:04	ISC	Keita	LVEA	Y	HAM2 beam alignment	18:28
19:26	SPI	Jeff	Opt Lab	Local	SPI alignment	21:53
19:37	ISC	Keita	LVEA	Y	HAM2 beam alignment	19:47
20:10	SEI	Fil	MER	n	HEPI electronics work	Ongoing
20:10	SPI	Josh	LVEA	-	SPI work at SUS-R2	Ongoing
20:11	SUS	Betsy, Ibrahim	LVEA	-	BBSS work	Ongoing
20:28	SUS	Randy	LVEA	-	BBSS work	21:38
21:06	IAS	Jason, Ryan C	LVEA	-	BS FARO surveying	Ongoing
22:24	ISC	Keita	Opt Lab	-	Looking for parts	23:02
22:44	ISC	Rahul	Opt Lab	-	Looking for parts	23:02
23:03	ISC	Keita, Rahul	LVEA	Y	HAM2 beam alignment	Ongoing

LHO General

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ryan.short@LIGO.ORG - posted 07:38, Monday 18 May 2026 (90260)

Ops Day Shift Start

TITLE: 05/18 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: 12mph Gusts, 6mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.15 μm/s
QUICK SUMMARY: No alarms over the weekend, temperatures looking normal, dust counts low as well. The same 31 channels are disconnected from the EDC since the CS HEPI pump controller is still down.

Likely continuing with alignment work in HAM2 today following the ISS array replacement.

LHO General

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ryan.short@LIGO.ORG - posted 16:38, Friday 15 May 2026 (90255)

Ops Day Shift Summary

TITLE: 05/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Alignment continued in HAM2 today after the Kobelco unit was worked on this morning. Ibrahim has been tidying up around the test stand area and wrapping up parts from the BSFM. Robert continued grounding studies at End X, and Jeff worked in the optics lab on SPI. His work requires leaving the laser running over the weekend in the optics lab; curtain is closed and proper signage is up.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
19:43	SAF	LASER HAZARD	LVEA	YES	LVEA IS LASER HAZARD	Ongoing
14:59	VAC	Jordan	LVEA	-	Check covers/RGA, shut down Kobelco	15:11
15:32	FAC	Kim	LVEA	-	Technical cleaning	17:02
15:41	SPI	Jeff	Opt Lab	Local	SPI prep work	19:33
16:25	VAC	Jordan	LVEA	-	Checking RGA	16:30
16:39	FAC	Randy	LVEA	-	Plugging in equipment	17:31
16:40	SUS	Ibrahim	LVEA	-	BSFM housekeeping	19:21
17:20	FAC	Kim	LVEA	-	Technical cleaning	18:00
17:41	ISC	Keita	LVEA	Y	HAM2 beam alignment	17:55
17:55	PEM	Robert	EX	N	Grounding studies (in/out all day)	Ongoing
17:58	VAC	Jordan	LVEA	-	Ramping up RGA temp	18:04
19:47	ISC	Keita	LVEA	Y	HAM2 beam alignment	21:42
20:40	VAC	Jordan	LVEA	-	Checking RGA	20:45
21:32	SPI	Jeff	Opt Lab	Local	SPI prep work	22:57
21:49	SUS	Ibrahim	LVEA	-	BSFM wrap, bag, tag	Ongoing
22:38	EPO	Oli +2	LVEA	-	Tour	Ongoing
23:05	VAC	Jordan	LVEA	-	End-of-day RGA check	23:10

LHO General

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ryan.short@LIGO.ORG - posted 07:42, Friday 15 May 2026 (90252)

Ops Day Shift Start

TITLE: 05/15 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, 3mph 3min avg
Primary useism: 0.06 μm/s
Secondary useism: 0.13 μm/s
QUICK SUMMARY: Work in HAM2 continues today as part of the ISS swap, but not until the Kobelco unit has had some maintenance done this morning. No in-chamber work allowed until that's finished. 31 disconnected channels on the EDC since the corner HEPI pump controller appears to still be down.

In other news, a M6.7 EQ out of Japan is rolling through, and it's a beautiful morning on-site.

LHO General

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corey.gray@LIGO.ORG - posted 16:30, Thursday 14 May 2026 (90242)

Thurs DAY Ops Summary

TITLE: 05/14 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Cement truck convoy day for CEBEX today. Bigger BeamSplitter "captured" in the suspension assy & FARO-ed in the afternoon. A couple big middle school tours. ISS Array alignment continued.
LOG:

1438 Kim finishing up with garb supply checks.
1524 technical cleaning in lvea (kim)
1543-1709 Charge Measurements (ryanC)
1547-1554 checking on pumps and overall VAC status (jordan)
1553 Rebar inspector arrived for CEBEX
~1615 LVEA transitioned to SAFE for....
~1615-1813 BBSS work (ibrahim,betsy,oli)
1640: susr2 rack work near ham3 (josh)
1648: Cement Truck convoy begins to MY!!
~1650 CP1 checks (travis)
1713-1723 Finley Middle School Tour (amber)
1715-2035 cleaning tests in-chamber....turned ON illuminator in BSC3 (bsc1 & bsc2 is already ON) (robert.tj)
1717-1755 Walkabout in lvea (richard)
1727-1821 technical cleaning in lvea (kim)
1758-1814 Finley Middle School 8th grader tour (maggie)
1815-1833 LVEA Transition back to HAZARD (tony)
1824- 2137 Corner rga (jordan)
1920-1930 checking FARO parts (stephenA)
1942-2324 team-ISS Array starting chamber work (keita)
- 2002-2248 rahul joining
- 2015 elenna joining
1943 -2120 team-BBSS back at it (ibrahim, betsy, randy)
1955-2012 Warming up FARO (jason)
2013-2225 CRS work in the CRS Lab (jim.shoshanna.michaelR)
2015-2158 SPI alignment + possible laser hazard (jeff.josh)
- 2158 jeff out
- 2224 josh out
2022 Connection alarm for HEPI_PUMPS, not a beckhoff issue, so will need jim to restore (notified Jonathan.patrick/CDS + Jim)
2038-2111 MER to check on HEPI cabling (fil)
2041-2055 connecting with jordan + betsy (travis)
2108-2258 sqzt7 beam profiling, turning sqz laser ON for this work and OFF when done (sheila.ryanS.tony)
2109-2328 team FARO getting set up at Test Stand (jason.ryanC)
2140 turned BSC123+HAM3 illuminators OFF (corey)
2243-2301 Checking out a pelican case (b&k) near HAM6 (tj.jim)
2246-2252 corner rga check (jordan)
2304 Checking on corner station HEPI Pump Station (jim)
2312 More BSC2 cleaning & tests. Turned BSC123 + H3 illuminators back on (robert w/ Oli-buddy)

LHO General

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corey.gray@LIGO.ORG - posted 07:34, Thursday 14 May 2026 (90241)

Thurs DAY Ops Transition

TITLE: 05/14 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: 0.01 μm/s
Secondary useism: 0.23 μm/s
QUICK SUMMARY:

New ISS Array alignment will continue as well as work with the new Bigger BeamSplitter.

No alarms overnight. Clearer & calmer weather this morning.

With the better weather, perhaps the DGR subcontractors will start pouring concrete for the CEBEX walls today (this will require the main gate to be left open for the cement trucks to roll through. (WP# 13250)

LHO General

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corey.gray@LIGO.ORG - posted 16:30, Wednesday 13 May 2026 (90222)

Wed DAY Ops Summary

TITLE: 05/13 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

ISS PD Array and BBSS work continues. Had a couple of big school field trip visits.

Odd weather day with fairly high winds and rain for most of the day.
LOG:

1534-1717 technical cleaning (optics lab and then LVEA + set-up at the old H2 PSL enclosure for upcoming work to be done inside it) [kim]
1545-1805 SQZT7 taking panels off (sheila)
- 1556-1657 tony joining
1554-1746 BBSS work working on connecting the Bigger Beamspliter to the suspension frame in the coming days (ibrahim)
- 1601- betsy joining
- 1643 oli joining
- 1700 randy joining
1611- 1613 Opening PSL Light pipe for ISS pd array & returning to control room to look at alignment (keita)
1627-1634 HAM6 ramp down rga bakeout & then move to CP1 to begin leak checking (jordan)
1708- ~2000 CRS (Cyllindrical Rotation Sensor) work at h2psl (jim,michaelR,shoshana)
1713-1935 ISS PD Array (keita,rahul)
1732-1815 EX ground studies continue (robert)
1736-1850 technical cleaning @EX (kim)
1751 SUSR2 rackwork for SPI (josh)
1800-1918 BBSS team returns for test stand to continue move to install the Bbs (betsy.randy.ibrahim)
~1730-1838 TCS plumbing work (tj,madi)
1830-1845 Outlook Elementary School tour (Amber)
1915-1930 Outlook Elementary School tour (Cassidy)
2018- 2149 TCS plumbing work cont.; will leave the chiller ON overnight. (tj,madi)
2039-2252 BBSS team returns to Test Stand (ibrahim, betsy, randy)
- 2216 randy out
2042 HAM6 RGA (jordan)
2046-2230 SPI build + possible laser hazard in the optics lab (Jeff)
2049 CRS work at h2psl (jim,michaelR,shoshana)
2049-2155 electronics work for CRS near h2psl (richard,fil)
2055-2116 Escorted rebar inspector to CEBEX site & made lunch (corey)
2100 ISS PD Array alignment cont (keita.rahul)
- 2229 Elenna joining for picomotor help
- 2329 Rahul out
2206 restarting bake of RGA at HAM6 and another quick check at 2330 (jordan)
2238-2255 Closing TCSy table (was letting it dry out) [tj]

LHO General

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corey.gray@LIGO.ORG - posted 07:36, Wednesday 13 May 2026 (90221)

Wed DAY Ops Transition

TITLE: 05/13 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: 19mph Gusts, 13mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.10 μm/s
QUICK SUMMARY:

ISS PD Array + LVEA Laser Hazard will continue. BBSS work continues at the Test Stand.

Rainy & windy morning (just had quick wind storm with gusts reaching almost 50mph just passed...forecast is for a windy day).

LHO General (OpsInfo)

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thomas.shaffer@LIGO.ORG - posted 16:30, Tuesday 12 May 2026 (90209)

Ops Day Shift End

TITLE: 05/12 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
SHIFT SUMMARY: The BS suspension was removed from the ISI that it hung from today. The LVEA continues to be in laser hazard for the ISS swap work, which will continue on for another day or so. Alignment trends attached, no surprises with the ongoing ISS work.

Operators - It looks like the LVEA temperature has been trending up over the last week (see screenshot). We should keep an eye on this to verify that it comes back.

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
19:43	SAF	LVEA IS LASER HAZARD	LVEA	Y	LVEA IS LASER HAZARD	12:03
15:14	FAC	Kim	LVEA	yes	Tech clean	17:05
15:17	IAS	Ryan C	LVEA	yes	Warm up Faro	15:33
15:20	FAC	Randy	LVEA	yes	Setting up lights at test stand	15:58
16:05	FAC	Randy	LVEA	yes	Prep and setup	16:36
16:20	SUS	Betsy, Rahul	LVEA	yes	BBS bonding and sus prep	18:46
16:27	SAF	Keita	LVEA	YES	Opening light pipe	16:44
16:31	FAC	Chris	MY	n	Bringing battery charger	17:31
17:01	SUS	Ibrahim	LVEA	yes	BBS work	18:56
17:03	SUS	Randy	LVEA	yes	Assist with BBS	18:38
17:17	PEM	Robert	EX	n	Magnetic coupling investigation	19:31
17:31	SEI	Jim, Michael, Shoshana	LVEA	yes	Moving CRS into the H2 PSL enclosure	19:03
17:34	IAS	Jason, Ryan C, Stephen	LVEA	yes	Monument search and error hunt	19:56
17:54	FAC	Kim	LVEA	yes	Tech clean	18:48
19:32	SPI	Jeff	Opt Lab	n	SPI assembly	21:56
19:33	SUS	Ibrahim	LVEA	yes	BBS work	22:03
19:43	SUS	Randy	LVEA	yes	BBS work	22:03
19:46	SUS	Betsy	LVEA	yes	BBS work	22:03
19:57	CDS	Marc, Josh	LVEA	yes	SUS R2 rack testing out SPI electronics	21:42
20:27	SUS	Rahul	LVEA	yes	BBS work	20:35
20:28	SUS	Travis	LVEA	yes	Bringing out hardware	20:33
20:50	FAC	Tyler	LVEA	yes	Inspect scaffolding	21:05
21:02	NCAL	Tony, Michael, Shoshana	EX	n	Spin up NCAL	22:13
21:05	SEI	Mitchell	ends	n	HEPI FAMIS checks	21:46
21:22	PEM	Robert	EX	n	Magnetic coupling invesitgation cont.	23:23
22:28	SEI	Jim, Michael, Shoshana	LVEA	y	H2 anteroom CRS build (M & S out @2300)	23:07

Images attached to this report

LHO General

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thomas.shaffer@LIGO.ORG - posted 07:35, Tuesday 12 May 2026 (90208)

Ops Day Shift Start

TITLE: 05/12 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 4mph Gusts, 1mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.09 μm/s
QUICK SUMMARY: IPC errors on h1susMC2 and h1seiproc, dackill on h1iopseib2. All sus aligned and damped except PR2 which is in safe (looking into this), SEI in state captured by the whiteboard. Temps look good and dust counts look good in the LVEA. More laser hazard work planned for the day in the LVEA.

LHO General

Link

thomas.shaffer@LIGO.ORG - posted 16:39, Monday 11 May 2026 (90197)

Ops Day Shift End

TITLE: 05/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
SHIFT SUMMARY: The LVEA is still in laser hazard and will be for a few more days. The IMC alignment continues to prove difficult to get right. ITMY IAS finished up today. BBS work continues, CP1 regen, and more!
LOG:

1629 light pipe open

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
19:43	SAF	LVEA IS LASER HAZARD	LVEA	Y	LVEA IS LASER HAZARD	12:03
15:07	VAC	Jordan	LVEA	yes	Checking on pumps and RGAs	15:17
15:27	CC	Ryan C	LVEA	yes	Grab dust monitor	15:42
15:43	FAC	Kim	LVEA	yes	Tech clean	17:13
16:26	ISC	Keita	LVEA	YES	HAM2/3 IMC alignment troubleshooting	18:20
16:27	ISC	Jenne	LVEA	YES	HAM2/3 IMC alignment troubleshooting	17:03
16:27	FAC	Randy	LVEA	yes	Measurements for more platforms around BSC3 area and emod area	16:47
16:29	IAS	Jason, Ryan C, Stephen A	LVEA	yes	ITMY Faroing in beir garten	20:16
17:15	VAC	Jordan	LVEA	yes	CP1 checks	18:25
17:36	FAC	Kim	LVEA	yes	Tech clean	18:19
17:49	VAC	Travis	LVEA	yes	CP1 work	18:31
18:17	SUS	Betsy, Ibrahim	LVEA	yes	BBS first contacting, suspension prep	19:50
20:06	SYS	Betsy	LVEA	yes	Checking that a chassis was turned back on	20:12
20:07	SAF	Ryan S	LVEA	yes	Checking on door	20:17
20:38	TCS	TJ, Madi	EX	Y	HWS table work	23:20
20:40	VAC	Jordan	LVEA	yes	HAM4 RGA	22:48
20:42	SUS	Betsy, Ibrahim, Rahul	LVEA	yes	BBS magnet gluing	23:42
21:13	ISC	Keita	LVEA	YES	HAM2 alignment	21:50
21:21	EE	Fil	LVEA	yes	HAM6 rack cabling	00:21
21:36	CAL	Tony	EX	-	Spinning up NCal	21:36
21:48	SPI	Jeff	Opt Lab	n	SPI work	23:03
22:19	SUS	Oli	CER	n	Taking rack pictures	22:23
22:25	PEM	Robert	EX	n	Grounding studies	00:25
22:49	VAC	Jordan, Gerardo, Travis	LVEA	yes	CP1 regen work	00:49
23:09	SEI	Jim, Michael, Shoshana, Stephen	LVEA	yes	Looking at cartridge and BSC2	01:09

LHO General

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thomas.shaffer@LIGO.ORG - posted 07:37, Monday 11 May 2026 (90195)

Ops Day Shift Start

TITLE: 05/11 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: 10mph Gusts, 6mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.12 μm/s
QUICK SUMMARY: IPC errors on h1susMC2 and h1seiproc, dackill on h1iopseib2. All sus aligned and damped, SEI in state captured by the whiteboard. Temps look good and dust counts look good in the LVEA, the ends saw counts up into the 2000s during the last bout of wind 12 hours ago.

Laser hazard work in the LVEA continues today.

LHO General

Link

corey.gray@LIGO.ORG - posted 16:34, Friday 08 May 2026 (90167)

Fri Ops DAY Shift Summary

TITLE: 05/08 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

MC2 was fixed (cabling issue---see their alog). ISS team went out to HAM2 late this afternoon.
LOG:

1513-1542 LVEA garb checks (kim.dawn)
1528-1536 MC2 work fixes continue w/ work at racks (Rahul)
1549-1558 restoring mc2/pr2 cables (rahul)
1622-1628 reboot coil driver for mc2 (rahul.marc)
1655-1704 Dust monitor being power cycled, since it's been down (ryanC)
1645-1800 LVEA technical cleaning (kim)
1700-1830 Back to HAM3 for more checks (rahul.marc)
1703-1818 open light pipe, working on iot1, no locking for jac (jennie, madi)
1711-1945 BS/BBSS OSEM swaps (thomas.oli)
1745-2001 SQZT7 back panel off for table work (sheila)
1834-1852 Back to HAM3 area for another round of checks (rahul.marc)
1851-2000 Continuing JAC work at IOT7 & closed light pipe when out(madi.jennie)
1900-1947 EX grounding studies (robert)
2016-2110 Going into HAM3 for cable checks (rahul.marc)
2036-2300 FARO-ing ITMy @BSC1 (jasaon.ryanC.)
- 2054-2300 Stephen joining
2110 Fixed MC2! Mix up in the cable due to install and/or drawing (rahul, marc)
2125-2150 Woodland High School (Maggie)
2110 Continue ISS Array work at HAM2 (kieta,elenna,jennie)
- 2255 elenna out
- 2300 jennie out
- 2305 jenne in
2110-2300 Checking IOT1 JAC stuff (jennie)
- 2311 back out
2234-2305 PCal checks at EX (marc)
- 2250 Marc plugged in cables and we have data for channels he was looking at
2239 EX grounding checks (robert)
2245 Checking on ISS work (rahul)
2315-2323 TCS chiller famis check (corey)
2327 Grabbing headsets for ISS array group (oli)

LHO General

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corey.gray@LIGO.ORG - posted 07:48, Friday 08 May 2026 (90166)

Fri Ops Day Transition

TITLE: 05/08 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: 4mph Gusts, 2mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.09 μm/s
QUICK SUMMARY:

ISS Array work continues...MC2 troubleshooting continues.

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thomas.shaffer@LIGO.ORG - posted 16:30, Wednesday 06 May 2026 - last comment - 15:37, Friday 08 May 2026(90146)

Ops Day Shift End

TITLE: 05/06 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
SHIFT SUMMARY: Lots of work being done in the LVEA. Scaffolding was erected around GV7, the BBS is here and getting magnets bonded and cleaned, the IAS team is finishing final shots on the old BS, CP1 is still warm, SPI plate was put onto HAM2, and more!
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:51	FAC	Kim	LVEA	n	Tech clean	16:42
15:17	FAC/VAC	Randy	LVEA	n	Prep for scaffold build around GV7	18:56
15:31	FAC/VAC	Eric	LVEA	n	GV7 scaffold build	18:56
15:38	FAC/VAC	Chris	LVEA	n	GV7 scaffolding build	18:56
15:59	VAC	Jordan	LVEA	n	Check on CP1 and HAM6 RGA	16:07
16:16	ISC	Elenna	Opt lab	n	OMC BHSS work	17:52
16:43	SPI	Jeff	Opt Lab, LVEA	n	SPI ISIJ board install	19:34
16:47	PEM	Robert, Jim	LVEA	n	HAM2/3 chamber work and contamination checks	19:27
17:01	SUS	Oli	CR/LVEA	n	BS health check	17:52
17:16	FAC	Kim	LVEA	n	Tech clean	17:54
17:16	IAS/SUS	Betsy, Jason, Ryan C, Stephen, Rahul, Ibrahim	LVEA	n	IAS and SUS work (Betsy out @ 1910, Ibrahim/Rahul out 1930)	20:44
17:25	CDS	Erik	CER	n	CDS laptops	17:29
18:43	-	Richard	LVEA	n	Check in on crews	18:45
19:59	CDS	Fil, Jackie	MER, LVEA	n	MER cleanup, HAM6 rack work	22:30
20:00	VAC	Gerardo	LVEA	n	Check on CP1	20:45
20:09	VAC	Jordan	LVEA	n	CS RGA work (HAM4 area +X)	22:05
20:33	SUS	Rahul, Ibrahim	LVEA	n	BBS bonding (Rahul out @ 23:26)	00:07
20:37	SUS	Betsy	LVEA	n	BBS and IAS check ins	20:44
20:39	FAC	Randy	LVEA	n	Cleanup around GV7 area	21:46
20:53	VAC	Gerardo	LVEA	n	Joining Jordan with the RGA	22:05
21:02	SUS	Betsy	LVEA	n	BBS work	23:58
21:02	CDS/SEI	Patrick	MER	n	Reimaging HEPI computer	22:26
21:06	-	Richard	LVEA	n	Check on crews	21:46
21:23	ISC	Elenna, Oli	Opt Lab	YES	BHSS OMC testing	00:23
21:24	TCS	Camilla	LVEA, Opt Lab	n	Clean up	21:30
21:45	IAS	Jason, Ryan C, Stephen	LVEA	n	BS alignment	00:45
21:46	SUS	Tom	LVEA	n	Check in with BBS crew	21:53
22:00	PEM	Robert	LVEA	n	HAM2/3 pictures and stray light	23:18
22:10	PEM	Tony	LVEA	n	HAM2/3	23:18
23:22	PCAL	Tony	PCAL lab	n	Retrieving beam profiler	00:22

Comments related to this report

gerardo.moreno@LIGO.ORG - 15:37, Friday 08 May 2026 (90187)VE

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(Randy T., Chris S., Eric O.)

Facilities set the scaffolding at GV7, the temporary work platform is set about 1 foot above the gate valve's bonnet, leaving clearance for all annulus pipes and other accessories.

Images attached to this comment

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eric.otterman@LIGO.ORG - posted 12:42, Wednesday 06 May 2026 (90137)

Mid station chillers

The chillers have been turned on at the mid stations for the season.

LHO General

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thomas.shaffer@LIGO.ORG - posted 07:40, Wednesday 06 May 2026 (90133)

Ops Day Shift Start

TITLE: 05/06 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: 4mph Gusts, 2mph 3min avg
Primary useism: 0.18 μm/s
Secondary useism: 0.23 μm/s
QUICK SUMMARY: Currently riding out a 5.8 earthquake from the Aleutians. No new alarms, CDS overview has expected errors in: h1iopsusb2h34, h1suslo12-bbss, h1iopseib2. and h1seiproc has an IPC error.

Dust counts - good
Temps - good
All chambers and suspensions in states according to teh whiteboard in the control room