[Mark, Tyler, Chandra]

This morning I burped dry N2 into blanked off volume above IP2's (new) gate valve to verify its o-ring doesn't leak prior to installing IP2 while corner is under vacuum. In the interest of time, we needed to reinstall this old pump in anticipation of opening to the beam tubes soon. Flange is leak tight (to background of 2.2e-9 Torr-L/s). It is being pumped with hung turbo overnight backed by leak checker. I tried turning HV on this evening, but voltage terminates at 800 V. We had vented this pump with room air thinking it would be shipped out for rebuild.

Today a newly rebuilt IP3 arrived, so I tested it by applying HV. The pumped shipped with good vacuum remaining (no need to pump out first). voltage = 7100 V; current = 11 micro-A (both channels combined); pressure = 5.4e-10 Torr. I then vented the pump body with dry N2 and burped/vented blanked off space of IP3's gate valve to verify it does not leak. Pump is ready for installation tomorrow morning.

When I was at the IP power supply rack, I noticed an error on IP5 PS:  "high voltage not detected (error 11)." Will investigate tomorrow. May need to pump IP5 back down with aux cart.