Next: GUI Screens
Up: Cryogenic Subsystems
Previous: Refrigerator
A high vacuum oil-diffusion pump, OVP91130,
is used to evacuate the cryostat's isolation vacuum (IV).
Once the cryostat is cold, a gate valve (PV91104)
between the pump and cryostat is closed.
The vacuum on the cryostat side if the gate valve
is measured by a cold cathode cathode gauge, PI91131,
while a Pirani gauge, PI91132, is used on the pump side of
the valve. Both gauges are controlled by a Pfeiffer dual
gauge controller which is read into the IOC via two ADC channels.
Inexperienced target operators are forbidden to operate the IV controls.
Christopher D. Keith
2001-08-23