Reports until 17:14, Tuesday 05 June 2018
LHO VE (VE)
gerardo.moreno@LIGO.ORG - posted 17:14, Tuesday 05 June 2018 (42343)
Corner Station NEG Pumps Valved In

Pumped out the gas out of the 3 NEG pump housing on top of the OMC tube, PT-191, PT-192 and PT-193.  There was no issues pumping down the volume on all 3 NEG pumps.  All 3 NEG pumps were valved into the main volume, PT-193 was first then PT-192, and PT-191 was last.

Unfortunately soon after the aux cart was decoupled from the PT-191 the pressure started raising (NEG was isolated from the aux cart via both of its valves), an indication of a leak somewhere.  We decided to isolate PT-191 from the rest of the vacuum system until we can resolve that issue, PT-192 and PT-193 remain valved in.