Chandra, Gerardo, Patrick

Degassed the two nude ion gauges in corner station - PT170 & PT180 on BSC 7 & BCS 8. First degassed PT170 (700degC for 3 min. according to manual). We monitored the adjacent PT120 CC gauge, where pressure barely rose (8.48e-9 Torr to 8.52e-9 Torr). Pressures at the two ion gauges rose significantly and caused a verbal alarm at the operator console; pressures spiked to ~2e-7 Torr and then settled down to base pressures.

Note:  degassing draws ~ 70 W and thus caused PT120 pirani to flat line and CC to read bogus pressure reading during degassing. This happened during PT180 degas, but not with PT170. 

We also noticed that PT140A periodically flat lines - linked to PT110 (?).