TITLE: 11/03 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC

STATE of H1: Broken?

INCOMING OPERATOR: Patrick

SHIFT SUMMARY: Earlier during the night we had issue with instability during Engage_SRC_Part2 (addressed by Sheila -- see alog31158). Later the IFO kept losing lock at Increase_Power. Since lockloss tool doesn't work I couldn't pull up the log prior to locklosses. Visually from the control signals and error signals nothing was going unstable. The lock just dropped as the power increased about the same place everytime. After the third lockloss Guardian complained about fast shutter. The test failed and I couldn't move on with the locking sequence. Richard went out to the rack and mentioned that he didn't get a good voltage reading when the shutter was opened but got okay reading when the shutter was closed. We checked GS13 to make sure that it saw the shutter motion and it did. However, the SYS channels that supposed to report shutter state and voltage didn't see anything (maybe this is why the shutter test failed?). So to my understanding the shutter is somewhat functioning. Anyway, right now it seems like the ISC_LOCK guardian is stall because of the FAST_SHUTTER guardian. I was able to make it all the way to DRMI_ASC_OFFLOAD before it refuses to move on.

Ops Info: On an unrelated note, violin modes have been coming back high every time after locklosses. At one point it saturated OMC DCPD. So be mindful before moving on pass DC_READOUT_TRANSITION.