Reports until 11:00, Monday 04 August 2025
H1 General
thomas.shaffer@LIGO.ORG - posted 11:00, Monday 04 August 2025 - last comment - 14:43, Monday 04 August 2025(86173)
Lock loss 1754 UTC

1438365262

No obvious cause yet. Commissioning was going on at that time, but no activity seems suspect.

Comments related to this report
thomas.shaffer@LIGO.ORG - 14:43, Monday 04 August 2025 (86180)

Relocking took a 3hr45min, mostly because we couldn't get DRMI to lock. I first tried locking without an initial alignment and then DRMI had little to no flashes, so I initiated an alignment. It went through quickly and without issue. Then when trying to lock DRMI again it would have great flashes and triggers, but it would rarely catch. The few times it did, we didn't make it much further before we had a lock loss.

I tried PRMI a few times and then I was reminded that we needed to touch up PRM since we don't have any ASC that will touch that up in this state. I ended up slightly moving PRM to increase POP 90, and then tried DRMI again. 7min later it locked and we made it all the way up to NLN.