Vacuum pumping of multimegawatt neutral beam injection lines

Journal Article · Sun Apr 01 04:00:00 EST 1984 · J. Vac. Sci. Technol., A; (United States)

DOI:https://doi.org/10.1116/1.572697· OSTI ID:6730634

Kim, J

Neutral beam injection lines employed for heating large tokamak and mirror plasmas have a unique gas pumping requirement, which is to maintain a high pressure (approx.10/sup -3/ Torr) in the gas cell neutralizer and a low pressure (approx.10/sup -6/ Torr) downstream after the neutralizer. Large hydrogen gas inputs (a few tens of Torr l/s) needed for operating an ion source and also the packing of multiple ion sources in a single beamline indeed make the beamline pumping a technological challenge, requiring a pumping speed greater than 10/sup 6/ l/s. We have witnessed, as beamlines get bigger, that beamline pumping techniques have shifted from conventional to gettering, and then to cryocondensation pumping. Cryopumping techniques are now employed in almost every beamline for high speed pumping; cryopanel design varies widely since the panels are an integral part of a beamline. A brief review is given of the beamline pumping technology, covering such topics as gas loading characteristics, vacuum components, cryopumping techniques, gettering techniques, and reactor relevant implications.

• Research Organization: GA Technologies Inc., San Diego, California 92138
• DOE Contract Number: AT03-76ET51011
• OSTI ID: 6730634
• Journal Information: J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 2:2; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205 -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
BEAM INJECTION
BEAM INJECTION HEATING
CRYOPUMPS
EQUIPMENT
GETTERING
HEATING
LABORATORY EQUIPMENT
NEUTRAL ATOM BEAM INJECTION
PLASMA HEATING
PUMPING
PUMPS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
VACUUM PUMPS
VACUUM SYSTEMS