oli.patane@LIGO.ORG - posted 11:23, Sunday 19 November 2023 - last comment - 15:14, Sunday 19 November 2023(74290)
Ops DAY Midshift Update
Been having trouble relocking all day. Wind and microseism have been high and increasing, and the ALSX beat note strength being below the minimum has been throwing ALS-XARM into error (74289). Lowering the beat note strength threshold has been working for getting us past LOCKING_ARMS_GREEN, but we have now lost lock at CARM_OFFSET_REDUCTION three times, each time having a lot of EX and other suspensions saturating and causing us to lose lock.
Luckily the wind is starting to lower a bit, so I'll let the detector sit in DOWN for a bit and then hopefully relocking will go much better.
21:01 Observing again at last!
Edit: I accepted the lower value for the ALS X beat note strength in SDFs for now because if the oscillating continues, we would possibly be back down around -10dB again a couple more times before Monday morning and cause the ALS_XARM node to keep erroring when trying to lock. Tagging OpsInfo and ISC because this needs to be reverted to -10 when the issue is solved.