aLIGO LHO Logbook

H1 General

ryan.crouch@LIGO.ORG - posted 07:34, Friday 18 September 2026 - last comment - 10:22, Friday 18 September 2026(91970)

OPS Friday Day shift start

TITLE: 09/18 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 5mph Gusts, 2mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.07 μm/s
QUICK SUMMARY:

Overnight Optics lab and PSL laser room dust alarms, 10k and 500 cts respectively
Temps, and CDS look good
EX pump down continues, the corner station X/Y BM pump downs will be resumed this morning

Comments related to this report

corey.gray@LIGO.ORG - 10:22, Friday 18 September 2026 (91973)

Link

Whoops, I forgot to post EVE summary last night (left site around 730pmPDT; here it is:

TITLE: 09/17 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: None
SHIFT SUMMARY:

Elenna/Louis/Keita were looking at MICH Pitch ASC Error signal with PRMI at beginning of the shift (see Elenna's alog).

Using PRM to put a line on AS_A_B and look at all quadrants' I & Q. Want to see the line only on Q, so adjust the Rotation Angle of AS_A_B while watching I's & Q's

Once commissioning work was done, handed h1 over to Jim for HAM2+3 measurements.
LOG:

2352 Camilla done with clean-up work
0019 h2psl bag & tag done (jim.mitch)
0023-0044 Turning on EX ALS laser to start warming it up (tony)
0111-0119 Turning off pumps (on x & y beam manifolds) for the night (jordan)
0215 Louis finished commissioning work. DRMI taken to DOWN & I sent Jim a message to let him know he can run his HAM measumrents.
0215 Louis noticed that nuc30 completely froze (I could not log into it either), so I toggled the power button on the computer and it relaunched everything on its own within a few minutes.