Reports until 07:35, Monday 15 December 2025
LHO General
thomas.shaffer@LIGO.ORG - posted 07:35, Monday 15 December 2025 - last comment - 12:19, Monday 15 December 2025(88508)
Ops Day Shift Start

TITLE: 12/15 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 25mph Gusts, 19mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.44 μm/s 
QUICK SUMMARY: Gate valves 5 & 7 closed, plan is to vent the CS and start the SUS CDS upgrade. Vent meeting at 830 in the control room today to coordinate.

Comments related to this report
thomas.shaffer@LIGO.ORG - 07:56, Monday 15 December 2025 (88509)
Link

Noting the current state of the select systems:

  • SEI
    • HAM7 - ISI tripped due to vent work
    • HAM3 - Looks like the ISI tripped Dec 13 0723 UTC. Untripping now.
    • As vent work progresses today, we will transition HAM1&2 into safe states
  • SUS
    • All SUS damped
    • OPO is in an odd state where the guardian says it's in SAFE, but the master switch is on and signals are going out. I'm guessing that this is the result of Friday vent activities. I will confirm with that team.
  • CDS
    • No major errors or systems in odd states
  • VAC
    • Gate valves 5&7 closed
    • Currently the CS is still under vacuum.
betsy.weaver@LIGO.ORG - 12:19, Monday 15 December 2025 (88516)
Link 

Full into Vent Mode now, here is the current plan for the next few days.
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