camilla.compton@LIGO.ORG - posted 10:51, Wednesday 14 June 2023 - last comment - 12:17, Wednesday 14 June 2023(70442)
Lockloss @ 17:41 UTC
1370799724 Lost lock at 17:41 UTC from an earthquake after 6h10 in Observing. X-arm PLL didn't lock straight away.
This was from an EQ in Tonga, peakmon only got up to 400. It's unusual for us to loose lock from an earthquake this small, see alog 70293. Tagging SEI.
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It appears that there was an LSC ring up with this lockloss, similar to other PRCL ring ups at 12 or 13 Hz, see alog 70379. Tagging ISC.
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NLN at 19:05, Observing at 19:14 UTC.
I touched the ALS X-arm PLL H1:ALS-X_LASER_HEAD_CRYSTALFREQUENCY as it wouldn't lock, otherwise lock was fully automatics, via 2x INCREASE_FLASHES for X-arm and PRMI locking.