USE OF THE EVAPOR-ION PUMP WITH THE LINEAR ACCELERATOR

Technical Report · Tue Feb 26 04:00:00 EST 1957

OSTI ID:4210626

Gould, C L

The pumping system for the Linear Accelerator must meet more stringeat requirements than that for the Alternating Gradient Synchrotron ring chamber. The ultimate vacuum must be near 1 x 10/sup -6/ mm Hg and the pump must not contribute any contamination to the chamber. This requirement seems to rule out oil diffusion pumps, and leaves as a choice, mercury pumps or getter-ion pumps. A titanium pump on a model section of the linac tank was tested to check gas handling capacity, ultimate vacuum, vacuum when RF power causes extreme outgassing, and build-up of titanium in the tank itself. The model section is a cylinder, 3 ft diameter, 4 ft long, of copper-clad steel. There are perhaps two dozen flanges of various sizes, sealed with O'' rings, spotted around the tank. A standard Evapor-Ion pump is corected through a six-inch valve to the tank, and a 15 CFM mechanical pump is used for roughing out. Considerable difficulty was found in initially obtaining a high vacuum in the Qak until some small lucite windows were replaced with glass. The total area of lucite was not over ten square inches but the best vacuum obtainable with the lucite present was 1 x 10/ sup -5/ mm Hg. When glass was substituted, 1 x 10/sup -6/ was consistently reached. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-13-021262
• OSTI ID: 4210626
• Report Number(s): AECU-4324; ADD-CLG-6
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

COPPER
CYLINDERS
DEGASSING
DIFFUSION
EFFICIENCY
EVAPORATION
GASES
GLASS
IMPURITIES
ION PUMPS
IONIZATION
IONS
LINEAR ACCELERATORS
MERCURY
MICROWAVES
MOCKUP
OILS
OPTICAL SYSTEMS
PARTICLE ACCELERATORS AND HIGH-VOLTAGE MACHINES
POLYMERS
POWER
PRESSURE
PUMPS
SEALS
STEELS
SURFACES
SYNCHROTRONS
TESTING
TITANIUM
USES
VACUUM
VALVES
VESSELS
WINDOWS