camilla.compton@LIGO.ORG - posted 15:05, Saturday 28 October 2023 - last comment - 15:21, Saturday 28 October 2023(73800)
Lockloss at 21:58UTC
Lockloss after being in NLN for 5 minutes. 1382565549. Hadn't yet got into Observing after 20:46UTC lockloss 73799.
Third lockloss of the shift. No obvious reason again, environment, LSC and ASC signals look fine.
LVEA temperatures have a 0.5deg excursion but looks to be turning around, plot attached. The outside temperatures have changed a lot this week and we were seeing smaller excursions on Thursday/Friday. Tagging FMCS.
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Can see that LVEA temperature sensor 5A changed 1.7degF and some of the close optics show alignment drifts with this: PR2, MC2, ITMY. Plot attached. This could be the cause of the last two locklosses today.
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