When I arrived the control room, interferometer was not locked state.
So, I aligned the ITMX, ITMY, ETMX and ETMY to last PRFPMI_RF_LOCKED state, then interferometer locked.
Fig.1. shows the oplev signal of last lock(y cursor) and current value.
- Even 7 hour unlock, interferometer can recover
- But keep the PRFPMI_RF_LOCKED state during night is important.
1st lock
6:17 - 8:35(JST)
https://gwdet.icrr.u-tokyo.ac.jp/~controls/summary/day/20230420/isc/carm/#locked_lsc_