ryan.short@LIGO.ORG - posted 15:26, Sunday 13 August 2023 - last comment - 16:34, Sunday 13 August 2023(72181)
Lockloss @ 22:16 UTC
Lockloss @ 22:16 UTC - cause currently unknown, but several LSC and ASC loops showed something happening starting about 6 seconds before the lockloss.
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Possibly some very sudden ground motion? I noticed the LSC CPSFF spiked at the lockloss, but I don't have an explanation for where it could have come from.
The LSC-CPSFF_INMON channel has also been having these little hiccups every couple of minutes since the lockloss.
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The CPSFF hiccups are also seen in the ALS flashes, mostly ALS Y, so the ISI is certainly moving. The movement seen by the LSC CPSFF starts at the same time as the movement seen by the LSC and ASC signals.
As I write, the hiccups appear to have stopped.
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Back Observing as of 23:33UTC