Reports until 04:03, Tuesday 23 May 2023
ryan.crouch@LIGO.ORG -
posted 04:03, Tuesday 23 May 2023 - (69814)
OPS Tuesday OWL midshift update
- Spend the first hour in EQ mode, struggling to lock Yarm from this
- Was unable to get past DRMI, some other small issues (Yarm struggling, COMM IR not being found)
- Ended up running 2 initial alignments
- Checked OM alignments, SR3, SRM, tried restoring SRM sliders to a previous lock
- Ended up doing a manual initial alignment of the SRC and maually adjusted SRM ~300 microradians in P and ~150 in Yaw which fixed the AS AIR image
- Currently relocking at FIND_IR
The OMC is having trouble locking, the log keeps giving the same error message " Didn't find enough peaks, resetting and trying again" The OMC TRANS camera flashes appear very offcenter as well (bottom right), I was unsucessful trying to scan and lock by hand, I also tried to do a Graceful clear history as suggested by the the troubleshooting doc since the OMC-ASC values were all stuck at high values, clearing the history reset them but then they went right back to being high a few minute later.
It looks like the SRM came back up after the computer crash with some old SDF saved alignment (as they all might since we do not monitor, and therefore do not "Accept" in SDF very often). So the eventual resetting of it back via large-ish slider values restored it to a more recent locking alignment last night.
I have accepted these values in SDF for better luck next time, but we're chewing on how to ensure we are at the best alignment starting place after this type of computer reboot.
Patrick THomas wrote a script that operators can use to restore sliders to a specific time in the past, there is a link to it and gui on the IFO align screen. We should probably add this to any instructions we have for operators on how to come back from a computer problem.