Helium pumping by argon frosting on a 4.5 K surface

Helium pumping by argon frosting on a 4.5 K surface

Pumping of helium gas by means of argon frosting on a bare copper surface cooled to ∼4.5 K has been investigated in one of the neutral beamlines of the DIII‐D tokamak. The beamline is designed to handle high power hydrogen and deuterium beams and corresponding high gas feed rates. By prefrosting the...

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Bibliographic Details
Published in:Journal of vacuum science & technology. A, Vacuum, surfaces, and films Vol. 8; no. 3; pp. 3084 - 3087
Main Authors: Kim, Jinchoon, Schaubel, K. M., Colleraine, A. P.
Format: Journal Article
Language:English
Published: 01-05-1990
Subjects:
TOKAMAK DEVICES
CRYOSTATS
BEAM INJECTION
ION BEAMS
PUMPING
ULTRALOW TEMPERATURE
HELIUM
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Summary:Pumping of helium gas by means of argon frosting on a bare copper surface cooled to ∼4.5 K has been investigated in one of the neutral beamlines of the DIII‐D tokamak. The beamline is designed to handle high power hydrogen and deuterium beams and corresponding high gas feed rates. By prefrosting the cryo panels with argon in an actual beamline, multisecond helium gas pulses have been handled at a background gas pressure low enough for formation and transport of helium beams. Appreciable pumping of helium gas was observed even at an argon‐to‐helium ratio as low as 20.
ISSN:0734-2101
1520-8559
DOI:10.1116/1.576591