Neutral beam line pump with helium cryotrapping capability

Conference · Thu Aug 24 04:00:00 EDT 1978

OSTI ID:6796348

Batzer, T H; Patrick, R E; Call, W R

A neutral beamline cryopump has been developed that will cryocondense hydrogen and cryotrap helium either separately or simultaneously. The pump will be part of the apparatus for a direct conversion experiment to be installed on the LBL neutral beam test stand. The location of the pump between the direct converter electrodes and the neutral beam dump will maintain a sufficiently low pressure for efficient collection of the energetic beam ions. Further, the helium cryotrapping capability will permit the use of helium beams with the advantage of a single ion species in direct converter development. The specific pumping speed for hydrogen is 10.5 liters/sec/cm/sup 2/ at 6 x 10/sup -5/ torr. The maximum specific pumping speed for helium (cryotrapped at an argon to helium flow ratio of 30:1) is 3.52 liters/sec/cm/sup 2/ at 8 x 10/sup -6/ torr. The area of the chevron baffle is 1.5 m/sup 2/ providing a maximum through put of 16 torr-liters/sec of hydrogen and 4 torr-liters/sec for helium both at 1 x 10/sup -4/ torr. The design and development details and the operational characteristics will be discussed.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6796348
• Report Number(s): UCRL-81198; CONF-780953-2
• Country of Publication: United States
• Language: English

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CRYOGENIC FLUIDS
CRYOPUMPS
DESIGN
DIRECT ENERGY CONVERTERS
ELECTRODES
ELEMENTS
FLUIDS
HELIUM
HYDROGEN
LABORATORY EQUIPMENT
NEUTRAL BEAM SOURCES
NONMETALS
PERFORMANCE
PUMPS
RARE GASES
VACUUM PUMPS
VACUUM SYSTEMS