Helium pumping by argon frosting on a 4. 5 K surface

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)

DOI:https://doi.org/10.1116/1.576591· OSTI ID:6764819

Kim, J; Schaubel, K M; Colleraine, A P ^[1]

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1. General Atomics, San Diego, CA (USA)

Pumping of helium gas by means of argon frosting on a bare copper surface cooled to {similar 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.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 6764819
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Journal Issue: 3 Vol. 8:3; ISSN JVTAD; ISSN 0734-2101
• Country of Publication: United States
• Language: English

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