TITLE: 05/06 Eve Shift 23:00 – 07:00 (16:00-00:00), all times posted in UTC

STATE of H1: Observing

INCOMING OPERATOR: Corey

SHIFT SUMMARY: Waited a little under 2 hours for the earthquake near Papua New Guinea (and subsequent earthquake off the coast of Alaska) to ring down. Then started initial alignment, but had ALS fiber polarization issues. Eventually started locking, and lost lock several times from ENGAGE_DC_VIOLINS and POWER_30W. I initially assumed it was the SQZ TTFSS and turned on the noise eater. When it happened again, I tried to damp high violin modes (though none of them seemed to be increasing). The final time, I just moved out of POWER_30W as quickly as I could and the IFO quieted down. Been in Observing for 1.5 hours.

LOG:

23:00 (16:00) Start of shift

23:44 (16:44) Dave performing DAQ restart while we wait for the EQ to ring down

01:05 (18:05) Starting initial alignment

01:30 (18:30) Adjusting fiber polarization in both arms with Keita. X won’t go below 19%

02:15 (19:15) Starting locking sequence

03:40 (20:40) Lost lock from POWER_30W, I believe due to TTFSS being noisy. Turning on SQZ noise eater (temporarily)

04:11 (21:11) Lost lock from POWER_30W. Unsuccessful at damping violin modes

04:45 (21:45) Lost lock from ENGAGE_DC_VIOLINS

05:36 (22:36) Reached NLN, accepting SDF’s and checking violin modes

05:42 (22:42) In Observing mode

05:45 (22:45) Out of Observing briefly to turn off SQZ noise eater, back to Observing within the minute

06:28 (23:28) GRB (E331637)

06:49 (23:49) Going to EQ seismic configuration as a precaution for a 5.2 NE of Japan

07:00 (00:00) End of shift