ryan.short@LIGO.ORG - posted 08:52, Friday 11 July 2025 - last comment - 11:24, Friday 11 July 2025(85685)
Lockloss @ 15:41 UTC
Lockloss @ 15:41 UTC after 18 hours locked - link to lockloss tool
No obvious cause that I can see.
Back to observing at 18:00 UTC.
BS and PRM needed adjustment during DRMI locking, but no initial alignment was run. Also had an unknown lockloss during LOWNOISE_ASC, so acquisition took a bit longer this time.
For the lockloss from lownoise ASC, there appears to be some glitch in the suspension channels about 30 seconds before the lockloss, and it appears in all four test mass L2 channels and not in EX L3, suggesting it is coming from the ASC. However, I don't see any glitch in the ASC channels themselves. I also don't know if this caused the lockloss, or is just random. Pointing out in case we see it again.