TITLE: 07/22 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: Lost lock at 02:32 UTC. Upon relocking I got stuck at REDUCE_RF45_MODULATION_DEPTH and the OMC DCPDs started saturating (see mid shift report). I then broke the lock intentionally because the DARM spectrum was getting worse and I was afraid that I was ringing something up. Upon relocking the OMC DCPDs started saturating at DC_READOUT and I again broke the lock intentionally. At one point I also broke the lock by putting too high of a gain on one of the ITMY violin damping modes and tripped the RMS WD. I have since spent the majority of the evening sitting at ROLL_MODE_DAMPING and attempting to damp violin modes. I succeeded in damping ITMY mode 5 which seemed to bring down the spectrum considerably. In the first attached image the black line is a reference I took earlier (I'm sorry I didn't note when). I did not have much success damping ETMX mode 4. The only thing I changed was the damping filter gains. I have attached screen shots of the current settings. Towards the end of the shift I changed the bounce mode damping gains for all the optics from .1 to .5 per Cheryl's suggestion.
LOG:

00:46 UTC Kyle called to say he was onsite and would be in the VPW.
01:10 UTC Kyle in control room
01:11 UTC Kyle out of control room
01:32 UTC Kyle leaving
01:49 UTC Verbal alarms GRB alert
02:32 UTC Lock loss
02:48 UTC Verbal alarms GRB alert. Still relocking.
04:31 UTC Verbal alarms GRB alert
05:24 UTC Kim and Dan setting up telescope in parking lot