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Reports until 21:12, Saturday 25 May 2019
H1 General
corey.gray@LIGO.ORG - posted 21:12, Saturday 25 May 2019 (49445)
H1 Back To OBSERVING (down 2hrs46min): That Was Painful

At 1:04utc (5:04pm), H1 had a lockloss after 51+hrs of lock.

  1. 1:04-1:43:  Spent first 40min to try and relock (arms looked fine, PRM looked good), but lost lock after DRMI).  Since this took so long to get to that point, opted for an INITIAL ALIGNMENT.
  2. 1:44-2:17:  Alignment took roughly 35min (with Xarm Green taking a lot of time to converge to eventually allow OFFLOADING).
  3. 2:18 - 3:50utc:  Back to locking.  Spent about 90min of locking with a few failed attempts before/after DRMI.  For most recent attempt, hung out at OFFLOAD_DRMI_ASC for about 5min...and this was with some minor touch up with PRM & SRM mirrors...mainly waited until all the StripTool signals were flat and optimized.  Then just took H1 to NLN (from here took about 25min).
    • Had a couple of DIFFs for LSC/IMC/MCL trigger thresholds (attached).  Since these were just threshold values, I ACCEPTED them.
    • The diffs above occurred after the lockloss at 1:43utc

3:50utc:  Back To OBSERVING  (Have had a couple of large/long glitches in the first 15min so far.)

4:10:  Time to make lunch.

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