Kyle, Gerardo, John 

Soft-closed GV8.  Connected 75 l/s ion pump to purge valve of CP2.  PT134B in "alarm" as the result of the reduced hydrogen pumping speed of this configuration.  Calculations imply pressure indicated by PT134B should level off at ~ 5 x 10-7 torr.  Alarm setpoint for beam tube and cryopump cold-cathode gauges (i.e. PT134B)  is 1 x 10-7 torr.  

This experiment is motivated by a desire to vent the X-mid station while the XBM is also vented.  There would be no nominal ion pumps available to pump hydrogen from X1 with both of these volumes valved-out simultaneously.