aLIGO LHO Logbook

H1 General

ryan.crouch@LIGO.ORG - posted 16:36, Monday 30 June 2025 (85437)

OPS Monday day shift start

TITLE: 06/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Tony
SHIFT SUMMARY: We've had to relock twice, the second time we struggled a bit with DRMI. We're currently locked at NLN but trying to fix a SQZ SHG PZT issue.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:50	FAC	Randy	EndX	N	Chiller yard pump checks	16:01
15:13	FAC	Kim	MidY	MidY	Tech clean	16:20
15:14	FAC	Nellie	MidX	N	Tech clean	16:20
16:24	EE	Ken	Mezz	N	Electrical work	18:56
16:49	FAC	Chris	VAC Prep	N	Sanding	17:39
19:34	FAC	Randy	MidY	N	Inventory	20:30
20:06	FAC	Tyler	Mids	N	FAMIS checks	20:36
22:39	CAL	Tony	PCAL lab	LOCAL	Prep for tomorrows measurement	22:58

15:00 UTC dropped Observing to start commissioning
15:40 UTC lockloss
- 16:50 NLN
18:23 UTC lockloss
- 19:26 UTC NLN
- UTC Observing after some SQZ work
- 19:55 UTC Hanford monthly safety notification test
- 20:45 UTC we dropped Observing to fix the SQZ ANG servo
20:46 UTC lock loss
- I was prompted to find YARM by hand
- 21:28 UTC I did an alignment after 2x of DRMI being able to lock but too misaligned for ASC
- We still couldn't get DRMI, on the 2nd round of PRMI I tried to manually help PRMI after it locked
  - DRMI still took another 12 minutes after this, with some more small adjustments by me (~45 minutes in total)
- 23:21 UTC NLN but the SHG can't lock due to a PZT voltage issue (too low)