thomas.shaffer@LIGO.ORG - posted 14:26, Thursday 19 September 2024 - last comment - 14:27, Thursday 19 September 2024(80190)
Lock loss 1953 UT
No obvious cause for the 1410810810 lock loss. The lock lost tool tagged FSS oscillations, which do seem present, but the lock loss was very fast. There was no DARM wiggle as we often see, or movement in the ETMX.
Images attached to this report
Comments related to this report
Observing at 2106UTC.
Relocking was interesting. ALS Y had some odd glitches that caused a few lock losses. Tens of minutes later, the polarization of ALS Y and X started to change drastically. This caused the guardian to turn on the controller and adjust it. No idea why the polarization would act like this (screenshot attached). Eventually, after some lock losses at PRMI, everything worked itself out and the IFO made it up. I never touched anything, this was all fully auto without an initial alignment.
Images attached to this comment
