TITLE: 07/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 11mph Gusts, 6mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.05 μm/s
QUICK SUMMARY:
Relocking and in ACQUIRE_PRMI. Looks like we've been down for a couple hours and the hours before that that we were up we weren't Observing, even though we were in NLN. Normally, Corey would've been called, but it looks like H1 Manager wasn't set up last night so he didn't get called. Also, the operations mode was set to Observing all night, but thankfully that doesn't affect the summary pages.
Looking at earlier in this current lock reacquisition, we had two times where we lost DRMI during DRMI ASC (time1, time2). It looks like an oscillation started 10 - 15 seconds into DRMI ASC that caused DRMI to unlock. In the 10-15 seconds before it unlocked, ASC didn't look like it was doing a very good job anyway. The oscillation is somewhere between 2.5 to 3 ish Hz, but it's a bit variable and even harder to tell during the second time.
Luckily, after running an inital alignment, we were able to lock DRMI and did not see any oscillations or issues with ASC. Our DRMI lock also did not have an oscillation at the beginning of it either like these two did.