gerardo.moreno@LIGO.ORG - posted 00:45, Wednesday 29 October 2025 - last comment - 18:32, Tuesday 04 November 2025(87814)
CP1 LN2 Fill Line Pump Down
(Jordan V., Gerardo M.)
Connected valves to be able to pump down the CP1 LN2 fill line, we started with 26 micron of pressure and we pumped down on the system with a scroll pump for most of the maintenance period, we stopped the pump down of the fill line at around 11:45 AM with pressure down to 4 micron. Both valves were closed before turning off the scroll pump. Hoses, adapter and valves remain connected, we intent to visit this item next week again.
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Today all hardware used to pump down the fill line was removed, initial reading was that of 3 microns, but after all the items were removed the reported internal pressure went up to 7 microns. We'll take another reading next Tuesday.