TITLE: 08/28 Eve Shift: 2300-0500 UTC (1600-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Corey
SHIFT SUMMARY: High winds made locking very difficult, they're dying down as the shift is ending and I just finished an IA so I'm hopeful the IFO will be able to lock itself as we just got DRMI offloaded at 05:00UTC

Lock #1

• We managed to lock despite the wind in the late afternoon, and we returned to Observing at 23:30 UTC with a range of about 115. There was a lot of low frequency noise, low frequency coherence with SRCL and CHARD & DHARD both in Y.
• PI 31 started to ring up after a few minutes but SUS_PI was able to successfully damp close to the last second as we were getting DCPD saturations. The GRD had some trouble as it was ringing back up again, Naoki tried increasing the gain. This PI was causing SDF diffs and dropping us from Observing as well.
• 00:02 UTC lockloss

Lock #2

• The winds were even higher now, gusts over 40 mph and an avg of over 20mph.
• 00:17 UTC I held us in down as the the 5 min avg went up and over 30mph
• While ISC_LOCK was in down, I added a function to ISC_library and a call in to it in ISC_LOCK to run in PREP_FOR_LOCKING to log any and all of the SDF diffs as the tables switch that I've tested in the TEST node. I made sure the 2 codes' svns were up to date before making my changes, so if for some reason these throw an error, we can revert to the previous revision.
• 02:30 UTC I noticed the wind calmed down a bit, so I started trying to lock again
• Had to adjust SRM to lock DRMI
• 03:36 UTC lockloss at LOWNOISE_ASC
  • All the signals on NUC30 looked pretty ratty leading up to this

Lock#3:

• Lost it at DARM_TO_DC_READOUT
• 04:20 - 04:40 UTC ran an initial alignment as the ITM error signals have been looking large the past couple tries
• The wind was died down a good amount so I'm hopeful the IFO will lock