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Reports until 13:47, Monday 01 May 2017
H1 SYS (CDS, DetChar, ISC, OpsInfo)
jeffrey.kissel@LIGO.ORG - posted 13:47, Monday 01 May 2017 (35945)
Mid-day Update: Spent the morning Damping ETMY Bounce Mode, Then SEI B2 (Beam Splitter) Computer Crashed
J. Kissel, E. Merilh, J. Driggers, K. Izumi, D. Barker

Just on an update on the recovery process this morning:
- ~12:30 UTC Giant EQ in Alaska (LHO aLOG 35930)
    - EQ is on our tectonic plate, so happens too fast for Bartlett to switch ISI Systems to Robust / EQ mode, so they all trip
- ~14:30 UTC Giant Aftershock (LHO aLOG 35931)
    - Same story: EQ is on our tectonic plate, so happens too fast for Bartlett to switch ISI Systems to Robust / EQ mode, so they all trip
- ~15:00 UTC Ed Merilh takes over from Bartlett
- 16:30 UTC Ed having trouble with INITIAL ALIGNMENT (specifically with PRC WFS loops would not close)
    - Solution was to skip to MICH_DARK_LOCKED and make sure BS was well aligned, and then back to PRC and move PRM in pitch until AS port looked well
- ~17:30 UTC Finished with Initial Alignment, microseism and EQ band have sufficiently rung down to begin locking
- ~18:00 UTC Found that we couldn't get past LOCKING ALS because ETMY Bounce Mode, spent a LONG time running with ALS_DIFF at a factor of 10 less gain, and SLLOOOOWWWWLYY damping the mode with gains of 0.001, and we eventually got up to 0.028, and then
- ~20:05 UTC The SEI BS crashed.

Since we're already down, we voted for just completing all corner station and end station front-end reboots.
Dave's working on that now, more news on everything later.
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