thomas.shaffer@LIGO.ORG - posted 10:08, Saturday 29 June 2024 - last comment - 11:03, Saturday 29 June 2024(78742)
Lock loss 1655 UTC
Lockloss 1403715367
There was ground motion from an earthquake just after the lock loss, but the lock loss itself seemed to be quite sudden. ETMX sees those usual wiggles that we often see.
Robert had just started running HVAC shutdown tests, but this seems very unlikely to be the cause.
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Back to Observing at 1800UTC
I touched up TMSX P, PRM Y, and a bit pf BS P to speed of acquisition and avoid an initial alignment.
Our ALSX PLL beatnote seems to have gone quite bad ~10 hours ago, getting < -30 dBm. It recovered during this acquisition but I worry we will have more issues with this.
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