Around 4:30 pm local time the turbo pump on CP4 tripped for unknown reason. Coincidentally EY chiller pump tripped around the same time. Unfortunately a portion of the foreline (upstream of safety valve) back streamed through the turbo. Thankfully Gerardo was still on site and rushed to MY to turn it back on. But unfortunately the RGA was valved in. We will take a scan tomorrow to assess and then install the small IP at bottom of CP and reconnect the cold cathode gauge so we can leave the turbo valved out. Pressure currently at 2e-8 Torr.
Pressure rose to 7e-5 Torr over the course of an hour. Alarm threshold was set to 5e-5 Torr. Dave just lowered it to 5e-9 Torr. Current pressure is 4.1e-9 Torr, double what it was before the incident.
Because RGA was valved in, the filament tripped. I turned it back on at 10:17 am local. After 45 min. I took an initial scan and see a new water peak. Will scan again after further warm up and post results. This is what happens when you claim victory prematurely.
The IP is being pumped by aux cart. Will valve in this afternoon.