Camilla, Vicky
Screenshot of how we found the SQZ_FC and SQZ_OPO this AM. Two separate issues.
Only to-do might be fixing the SQZ_FC issue in FIND_IR. I hope the SQZ_OPO_LR issue is solved, but we will watch out for it.
More description of the issues from this morning/last night and how to fix it:
From it being STALLED and MANAGED, I took SQZ_OPO_LR to AUTO. This worked to un-stall it, and let it continue locking. If the scan is fixed, this should be enough to solve the problem.
--> Not sure why OPO guardian was "STALLED" when it jumped to "IDLE" state, but I think this is related to the guardian "jump" to IDLE. I'm not sure if we even want to fix this -- leaving the SQZ_OPO_LR guardian in STALLED was probably the correct move, otherwise it would have spent hours scanning the PZT without finding co-resonance. Better to fix issues with not finding co-resonance, maybe not much to do here.
OPO couldn't lock on co-resonance b/c that was at 104V, but PZT1 was only scanning up until 100V -- I changed the scan offset.
OPO did not find co-resonance within its scan range, then it timed out, jumped into IDLE, and the guardian STALLED. See sqz locking screenshot -- increasing the scan range let it find co-resonance at 104V, and then SQZ_MANAGER easily went back up to FDS.
I increased H1:SQZ-OPO_PZT_1_OFFSET from 0V to 15V, and saved this 15V offset in SDF. We cannot increase H1:SQZ-OPO_PZT_1_SCAN_STOP above 100V in slowcontrols, so we have to increase the scan offset to get the PZT there.
Note, back when OPO_PZT2 was at 0V (before 76688), I think the OPO would often find co-resonance between 100-110 V during O4a.
Based on a previous opo co-resonance issue, 76642 seemed to want to the scan starting around ~50V. Today's issue shows we want to scan beyond 105V, probably up to 110V or even 115V (the max). Based on OPO cavity scans (e.g. screenshot from LHO:75285), I think OPO PZT1 is not super effective (in terms of um/V scanning) below 50V or so.
Let's try scanning from 55V - 115V to guarentee we find co-resonance. This is how it's currently set. This corresponds to the first screenshot, where H1:SQZ-OPO_PZT_1_OFFSET = 15V (saved in SDF), H1:SQZ-OPO_PZT_1_SCAN_START = 40, H1:SQZ-OPO_PZT_1_SCAN_START = 100V.
Conveniently there are some nicer glitch-free NO SQZ and FDS times:
NO SQZ: 1396084368 - 1396087119 (~46 min)
FDS: 1396072807 - 1396075570 (~46 min)
Eric, Camila