austin.jennings@LIGO.ORG - posted 06:59, Saturday 28 October 2023 - last comment - 08:42, Saturday 28 October 2023(73791)
TCSX Laser Unlock
The TCSX laser unlocked this morning at 13:38 UTC 10/28. Before I had a chance to get into NoMachine to check it out, the laser relocked itself again at 13:45 UTC.
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This is the first time the CO2X laser has unlocked since the new chiller was installed 73704. On CO2 unlock, the TCS_ITMX_CO2 guardian couldn't find a lock point so stepped the chiller temperature which starts a 5 minute timer before scanning PZT again. Total time down was ~7m30s. This issue has associated FRS#28943. If this happens again we could add a longer timer to IFO_NOTIFY (currently alerts after 3 minutes out of observing) if the CO2s are not nominal.
The PZT has been much noisier since the chiller was swapped 4 days ago, see attached pink trace. Is also noisier than CO2Y.
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