Reports until 19:35, Tuesday 11 July 2017
LHO General
patrick.thomas@LIGO.ORG - posted 19:35, Tuesday 11 July 2017 (37468)
Ops Eve Shift Summary
TITLE: 07/11 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Earthquake (since I believe this is still recovery from the earthquake in Montana)
INCOMING OPERATOR: Canceled (would have been TJ)
SHIFT SUMMARY: Jeff K. and I have talked with Vern and we agreed to call it a night. The remainder of this shift and TJ's owl shift have been canceled. I have notified TJ, Corey and LLO. I have set ISC_LOCK to DOWN for the night. I believe Jeff K. speculated that something may be wrong with the AS signal. The last lock loss occurred after the appearance of a violin mode or modes at around 501 Hz that were not there in the previous lock. I believe everyone except Thomas V. has left. I may stay to work on other projects.
LOG:

23:19 UTC The OMC_LOCK guardian was not completing. Jenne pointed out that the OMC ASC was saturating (Sitemap -> OMC -> OMC Control -> bottom right outputs). She had me click 'Graceful clear history' (in purple on the same screen). Once the outputs went to 0 I re-requested READY_FOR_HANDOFF and the OMC_LOCK guardian completed successfully.
23:52 UTC Jeff K. turning off excess damping. Lock loss on transition from DC_READOUT_TRANSITION to DC_READOUT.
23:56 UTC Kiwamu to CER to plug in RF90 sensor
00:08 UTC I changed the Ops Observatory mode from Aligning to Lock Acquisition and then to Earthquake since this may still be recovery from the earthquake in Montana.
00:14 UTC Stopped at DC_READOUT_TRANSITION. Stepping through by hand. Lost lock on loading matrix to transition to OMC.
00:30 UTC Stopped at DC_READOUT_TRANSITION. Jenne and Kiwamu investigating.
00:34 UTC Robert and Pep to end Y VEA. Looking for lines from RF card reader and WIFI.
01:00 UTC Robert and Pep back.
01:01 UTC Kiwamu didn't find anything to account for the lockloss on transition to DC_READOUT. Tried again. Worked this time.
01:12 UTC Lock loss while damping 509 Hz violin mode while sitting at LOWNOISE_ASC.
01:38 UTC Lock loss sitting at DC_READOUT_TRANSITION while attempting to lock OMC.
01:52 UTC Lock loss at ENGAGE_SOFT_LOOPS. Appearance of violin mode at around 501.75 Hz. Not rung up in previous locks.
02:03 UTC Set ISC_LOCK to DOWN and leaving it for the night.