nutsinee.kijbunchoo@LIGO.ORG - posted 00:54, Saturday 19 November 2016 - last comment - 05:52, Saturday 19 November 2016(31638)
Ops Owl Shift Transition
TITLE: 11/19 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Initial Alignment
OUTGOING OPERATOR: Cheryl
QUICK SUMMARY: Cheryl reported issue DRMI ASC (PRC and SRC ran away?) so she was doing an initial alignemt. Since the alignment hasn't been changed I wanted to see for myself so I let ISC_LOCK take control and try again (making measurement for Sheila in the process). X arm green couldn't get to 0.9 so I moved ITMX and TMSX (knowing it's probably be terrible for the michelson). PRMI indeed looked terrible so I went back to Initial alignment to take care of the corner station optics. I just finished the green arms. Beatnote was terrible for so I moved PR3.
Sheila, Nutsinee
Broke lock while sitting at Noise Tuning trying to figure out if Tidal servo really came on (noticed IMC_F_OUT16 went off from 0). Prior to the lockloss the most obvious ranaway signal was CSOFT Yaw (at 2Hz -- Sheila said it's DC1 Yaw instability). Then relocked and stopped at DC readout to figure out the tidal thing again. Tidal is not on. There seems to be signal going in but nothing comes out. We don't know how to make it turned on. I also attached the DC1Y centering loop measurement at DC readout.
I skipped PR3_REFL_WFS and CLOSE_BEAM_DIVERTERS abd landed at SET_REF_POWER because Sheila reported that close beam diverter caused a lockloss when tidal didn't come on. Apparently I'm not supposed to land there since there's no path to NLN. I manually went to NLN. Jitter noise looks worse than last night. BNS range also seems worse.
I was told to turn off all the PI damping at DC readout. This is a bad idea. The three usual modes rung up within 10 minutes into the lock and I ended up have to damp all three mode at once. I'm not turning the gains off for the rest of the night.
For zeroing of PI gains, see Terra's alog 31593, and the Ops Sticky Notes.