TITLE: 10/24 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Busy day of continuous troubleshooting of H1. Things have been learned and progress has been made, but currently still waiting to relock after discovering an incorrect whitening setting and swapping a sat amp to see if those help with some of our instabilities. We've had some locklosses at DRMI_3F, but waiting for DRMI ASC to fully converge on this most recent try seemed to work. Currently relocking up to MOVE_SPOTS.

• 14:35 - Starting initial alignment
• 15:06 - Starting lock acquisition
  • Applied roll mode damping (G = -200) during LOWNOISE_LENGTH_CONTROL
  • Waited for 30 minutes to watch for roll mode ringups, saw none
  • Went through LOWNOISE_ASC once DHARD_P lownoise steps commented out (alog87712)
  • Saw 1 HZ ASC oscillation once at NLN, transitioned to high gain ASC configuration
• 17:03 - Lockloss after ~1:15 at max power with 5.8 Hz DARM "pulse" behavior (alog87717)
• Holding down for sat amp swap (alog87722)
• 17:38 - Starting lock acquisition
  • Applied roll mode damping (G = -200) during LOWNOISE_LENGTH_CONTROL
  • Skipped over LOWNOISE_ASC entirely
• 20:59 - Lockloss similar to before with ~1:15 at max power and 5.8 Hz DARM "pulse"
• Discovered incorrect POP A RF45 whitening setting, fixed (alog87728)
• 21:30 - Starting initial alignment
• 21:55 - Starting lock acquisition

LOG: