TITLE: 11/04 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism, LOCK_ACQUISITION
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

We spent most of the day with the secondary microseism mostly above the 90th percentile, it started to decrease ~8 hours ago but still remains about half above the 90th percentile. The elevated microseism today is from both the storms by Greenland and the Aleutians as seen by the high phase difference for both the arms with the corner station (bottom plot).

We keep losing it at the beginning of LOWNOISE_ESD_ETMX, I see some ASC ringups on the top of NUC29 (CHARD_P I think?), no FSS glitches before the locklosses, no tags on the lockloss tool besides WINDY. It's always a few seconds into the run method, I was able to avoid this by slowly stepping through some of the higher states (PREP_ASC, ENGAGE_ASC, MAX_POWER, LOWNOISE_ASC). I'm not sure which of these is the most relevent to not see the ringup, probably not the ASC states as when I paused there but forgot MAX_POWER I still saw the ringup.

LOG: No log.

• 00:53 UTC LOWNOISE_ESD_ETMX lockloss
• 01:57 UTC LOWNOISE_ESD_ETMX lockloss
  • These both had similar behavior to what Corey saw here alog80720 and TJ here alog80954
• 02:44 UTC MAX_POWER lockloss (did not ring up the violins luckily)
  • IMC lost it at the same time as ASC, FSS_FAST channel starting growing ~7 seconds before the LL
  • Over a dozen IMC locklosses trying to get to GREEN_ARMS
• 03:30 UTC LOWNOISE_ESD_ETMX lockloss
  • I tried stepping a little slower through some of the states leading up to it (PREP and engage ASC), I was going to also pause in MAX POWER but I accidentally moved it on
• 04:00 UTC PREP_DC_READOUT_TRANSITION lockloss
  • IMC and ASC lost it at the same time, some small FSS glitches starting ~350ms before the LL
  • PSL-FSS_AUTOLOCK_STATE moved ~20 ms before ASC
• 04:41 UTC lockloss TRANSITION_FROM_ETMX
  • Things were looking great (The ASC signals mainly), I had paused for 30-45 seconds after PREP_ASC and ENGAGE_ASC, then I waited 60 seconds after MAX_POWER and another 60 seconds after LOWNOISE_ASC finished
  • ASC lost it 150ms before IMC, I did not see any ASC ringups this time (IMC_REFL_SERVO_SPLITMON ran away?)
• 05:38 UTC TRANSITION_FROM_ETMX lockloss, lost it at a different spot in the run method than before
  • No ASC ringup, ASC lost it ~100ms before IMC