Helium glow wall conditioning of the DIII-D tokamak with large area graphite coverage

Conference · Sun Feb 04 23:00:00 EST 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6690876

Jackson, G L; Taylor, T S; Petersen, P I; Taylor, P L ^[1]

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1. General Atomics, San Diego, CA 92138 (USA)

Helium glow wall conditioning (HeGWC) is the primary technique for conditioning the DIII-D walls which are composed of Inconel and graphite. Presently, 40% (31 m{sup 2}) of the DIII-D plasma facing surfaces consist of graphite tiles covering the inside, top, and bottom DIII-D walls which are the high heat flux surfaces for divertor and inside wall limiter discharges. HeGWC with T{sub wall}{le}50 {degree}C is effective both in removing low {ital Z} impurities and desorbing hydrogenic particles from this large graphite reservoir. The effective desorption of hydrogen species from the graphite has led to lower recycling and improved particle control during tokamak discharges.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 6690876
• Report Number(s): CONF-8904230--
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (USA), Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Vol. 199:1; ISSN APCPC; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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CLEANING
CLOSED PLASMA DEVICES
DESORPTION
DOUBLET-3 DEVICE
ELECTRIC DISCHARGES
ELEMENTS
FIRST WALL
FLUIDS
GASES
GLOW DISCHARGES
HELIUM
HIGH-BETA PLASMA
IMPURITIES
NONMETALS
PLASMA
RARE GASES
SURFACE CLEANING
SURFACE FINISHING
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
TOKAMAK DEVICES
VACUUM SYSTEMS