TITLE:    Dec 18 EVE Shift 00:00-08:00UTC (16:00-00:00 PDT), all times posted in UTC

STATE Of H1: Observing

SUPPORT: Jason

INCOMING OPERATOR: Nutsinee

SHIFT SUMMARY:

After repeated locklosses waiting at various stages of the locking sequence after I had changed the blends to QUITE_90 as recommended. I decided to switch back to the 45mHz blends at the end stations. I let the IFO “cook” on ENGAGE_ASC_PART3 for a good long while before advancing. I can’t say conclusively that this change in the ISI blends did the trick, but the IFO went all the way to NLN/78Mpc and it’s been there ever since. EQ bands are nominal. The mean uSeism is slightly above the 90th percentile. Wind is calm. Handing off Locked IFO to Nutsinee.

ACTIVITY LOG:

04:34 Lockloss while at ENGAGE_ASC_PART3

05:00 Switched end station blends to Quite_90 (off axis) to see if locking would improve.

05:33  still no satisfaction locking. Lock breaks at DC_READOUT_TRANSITION, repeatedly. I put a call in to Sheila.

05:32 OMC SUS watchdog tripped.

05:53  it appears that when DC_READOUT_TRANSITION occurs that OMC_LOCK reports OMC not ready as it may still be in TUNE_OFFSETS.

06:05 Waited at ENGAGE_ASC_PART3 for OMC to move to READY_FOR_HANDOFF. Lockloss occured, this time, at the very next step (REFL_IN_VACUO)

06:21 Locklos occurred sitting on ENGAGE_ASC_PART3 Grasping at straws at this point. Haven’t heard back from Sheila.

06:51 FINALLY! Locked at NLN. Switched back to 45mHz blends at Ends. Had to manually start ISS second Loop