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Reports until 07:52, Tuesday 24 March 2026
LHO General
corey.gray@LIGO.ORG - posted 07:52, Tuesday 24 March 2026 - last comment - 08:49, Tuesday 24 March 2026(89611)
Tues DAY Ops Transition: Maintenance Day

TITLE: 03/24 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 14mph Gusts, 10mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.19 μm/s 
QUICK SUMMARY:

Arrived to see lots of tripped Watchdogs.  This was due to a M7.5 Tonga earthquake from last night just before 10pm local time (5utc).  Dave contacted me to give me the heads up on this and noted that ITMy actually had the Hardware Watchdog trip---this requires someone to go out to the CER to push a button to restore coil drivers.  We were hesitant on addressing this without Jim's guidance--not sure how powering things back on would affect the system.  Will message Jim with a heads up for BSC1's ITMy/BSC1-ISI/BSC1-HEPI.  Will continue bringing everything else back.

Other than that, today is Maintenance Day.  The Filter Cavity Tube has light flashing and so its small gate valves must still be open (I had thought the discussion was to close these gate valves to allow craning over the FC Tube, but not certain on this.

Day1 of 2-day CEBEX workshop begins today.

Comments related to this report
corey.gray@LIGO.ORG - 08:49, Tuesday 24 March 2026 (89614)CDS, SEI, SUS

Earthquake Recovery Status:

ITMy Hardware Watchdog continues to be looked at with Fil/Jonathan

UPDATE:  Fil was able to restore the ITMy watchdog (he held the RESET for a few seconds and waited for the lights to change on the front panel).  ITMy HEPI/ISI are redamping/isolating.

  • HAMs restored:  HAM1/2/3/4/5/7/8
  • BSCs restored:  ETMy/BS/ITMy/ETMx/ITMx
    • HEPIs restored:  ETMy/ITMy/ITMx
  • Software Watchdogs restored: 
    • ETMy:  SUS & SEI
    • ITMy:  SUS & SEI
    • ITMx:  SUS & SEI
  • Hardware Watchdog tripped:  ITMy (just got restored by Fil)
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