thomas.shaffer@LIGO.ORG - posted 14:33, Wednesday 19 August 2026 - last comment - 21:17, Wednesday 19 August 2026(91595)
Ops Day Shift Start
TITLE: 08/19 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: 4mph Gusts, 1mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.07 μm/s
QUICK SUMMARY: Dust alarms in the PSL overnight, but they quickly dissapated. There was a verbal alarm at 0828UTC "Check corner station HEPI pumps", I don't initially see any issues but I'll continue to investigate.
Plan today is continued corner station commissioning unless we get the arms opened.
Sure enough there was a brief pressure dip in the CS HEPI pump pressures that it immediately recovered from. The 4 pumps and the supply and return all see it.
Looking into this a bit further, pump 4 sees the largest pressure change. Local IPS sensors on HAM3 see this change, but Jim said that their locationmon channels did not see it.