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Vacuum System

Two Edwards diffusion pumps, (a 6'' and 4'' throat diameter) evacuate the source and flight regions, respectively. Typical operating pressures are 5 x 10-6 torr in the source region and 6 x 10-8 torr in the flight region. The diffusion pumps are backed by an EM12 rotary pump to a pressure of 0.02 torr. Ion gauges are used to determine the pressures in the flight and source regions and a Pirani gauge used to monitor the pressure in the backing lines between the diffusion and rotary pumps.



Tim Gibbon
1999-09-06