System
• Turbo pump for base pressures to
10
-8
Torr
– pumping rate between gauge and pump: 12.5 l/sec
(pump alone: 360 l/sec)
– system vent with dryN
2
between thermal cycles
• Ion pump for base pressures to 10
-10
Torr
– pumping rate between gauge and pump: 11.7 l/sec
(pump alone: 400 l/sec)
– system under constant vacuum
• Baffle systems used to ensure identical conductance
pathways
– no line-of-site between samples
