nutsinee.kijbunchoo@LIGO.ORG - posted 00:40, Thursday 17 September 2015 - last comment - 03:29, Thursday 17 September 2015(21605)
Owl Shift Transition
TITLE: Sep 17 Owl Shift 07:00-15:00UTC (00:00-08:00 PDT), all times posted in UTC
STATE Of H1: Lock Acquisition
OUTGOING OPERATOR: Ed M.
QUICK SUMMARY: Attempting to lock the interferometer. I couldn't get any flashes on POP 18 and 90 while trying to lock PRMI. Since Ed did the initial alignment when the ground motion was still high I think I might try to do the initial alignment again when the ground motion become less active.
I finished the initial alignment. After having trouble with INPUT_ALIGN I looked at IM4 and PR2 alignment. IM4 alignment was way off from the last time the ifo was locked. I paused the Guardian and brought IM4 back to where it was. After that it locked in the wrong mode so I adjusted PR2 YAW. I had a little trouble with MICH_DARK_LOCK. BS ISI Watchdog tripped twice. I requested DOWN and waited until the optic settled then tried again. I also had to touch PR3 to maximize COMM beatnote. Everything went well. Now begin lock aquisition. The ground motion has come back to its nominal after series of earthquakes.
Guardian stalled at DC_READOUT_TRANSITION. OMC locked at a wrong mode. Lost lock at DC_READOUT shortly. T2, T3, LF and RT osems had huge number of counts. I called Sheila and she suggested I monitor where the offsets came from. Now relocking.