aLIGO LHO Logbook

LHO General

ibrahim.abouelfettouh@LIGO.ORG - posted 16:44, Tuesday 27 January 2026 (88923)

OPS Day Shift Summary

TITLE: 01/28 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in IDLE for PLANNED MAINTENANCE

Good progress on activities today.

HAM7 - Cables were nudged in suspicion of rubbing due to OPO transfer functions that were "off" (alog 88917, alog 88913). The result were much better OPO Transfer Functions - alog 88921 Work will continue tomorrow.
HAM1 - Work has continued on the EOM which was successfully tuned, but there are still frequency changes that are unstable. Frequencies are 10, 20 kHz off. Work is continuing.
BSC2 - Inspection and walkabout.
EX - PCAL Measurements successful. They will transition to Laser Safe shortly.

Other:

Fire Pump Test at 10AM - successful
Beckhoff Restart
DAQ Restart
HVAC Work on airhandlers done across the site

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
22:49	SAF	LVEA IS LASER HAZARD	LVEA	YES	LVEA IS LASER HAZARD \u0d26\u0d4d\u0d26\u0d3f(\u239a_\u239a)	16:49
15:44	FAC	Nellie	LVEA	Y	Technical Cleaning	17:06
15:51	SUS	Betsy	LVEA	Y	BSC2 Inspection	17:51
15:51	FAC	Randy	LVEA	Y	BSC2 Inspection	16:22
16:01	FAC	Kim	LVEA	Y	Technical Cleaning	17:06
16:33	FAC	Richard	LVEA	Y	BSC2 Inspection	17:07
16:33	FAC	Randy	LVEA	Y	BSC2 Inspection	23:04
16:42	PCAL	Tony, Dripta	PCAL Lab	N	PCAL Meas.	17:13
17:10	FAC	Eric, Chris	EX, EY, MX, MY	N (YES EX)	Air Handler and HVAC Maintenance	18:28
17:14	PCAL	Tony, Dripta	EX	Y	PCAL Measurement	19:17
17:16	EE	Fil	LVEA	Y	Moving electronics by HAM6	20:21
17:33	ISC	Jennie	LVEA	Y	Turning on light pipe	17:35
18:06	FAC	Kim, Nellie	LVEA	Y	Technical Cleaning	18:44
18:08	SUS	Rahul	LVEA	Y	HAM7 OPO	18:31
18:14	TCS	Matt, Sophie	JOAT/Vac-Prep Lab	N	CHETA	15:14
19:05	EE	Marc	HAM1	Y	EOM Electronics	20:11
19:06	EE	Daniel	LVEA	Y	HAM6 Electronics	20:11
19:07	OPS	Oli	LVEA	Y	Reminding Daniel about a meeting	20:21
19:07	COC	Masayuki, Jennie	LVEA	Y	HAM1 EOM	20:45
19:08	SUS	JAson	LVEA	Y	HAM1 EOM	20:46
21:08	EE	Fil	LVEA	Y	HAM6 Electronics	23:06
21:11	PCAL	Tony, Dripta	EX	Y	PCAL Meas.	01:11
21:37	SUS	Sheila, Rahul	LVEA	Y	HAM7	22:48
21:45	COC	Elenna, Keita	Optics Lab	N	EOM	00:34
22:05	SUS-FAC	Travis, Jim, Betsy, Gerardo, Tyler, Randy	LVEA	Y	BSC2 Inspection	23:04
22:10	COC	Masayuki, Jason	LVEA	Y	HAM1 JAC	00:07
22:13	TCS	Marc, Jennie	Vac-Prep/JOAT Lab	N	CHETA Lable Table Cable	23:59
00:41	EE	Marc	LVEA	Y	EOM Reconnection	01:41