Initial conditioning of the vessel wall and the graphite limiters in DIII (Doublet III)-D

Conference · Sun Jun 01 04:00:00 EDT 1986

OSTI ID:7012088

Brooks, N H; Petersen, P

The Doublet III tokamak has been rebuilt to accommodate in a single device both large dee-shaped limiters and single-null divertor plasmas (a = 0.67 m) with high elongation (b/a greater than or equal to 2). The new vacuum vessel has been conditioned by a combination of 400/sup 0/C baking, Taylor pulsed discharge cleaning (TDC), and rf-assisted glow cleaning (RGC). Tokamak operation began in February 1986 with an 0.5 MA discharge produced on the first day plasmas were attempted. Rapid achievement of high current (I greater than or equal to 2.5 MA) tokamak discharges in the DIII-D device underscores the importance of high temperature bakeout in shortening the initial cleanup period for a vessel with large amounts of graphitic armor.

• Research Organization: General Atomics Co., San Diego, CA (USA)
• DOE Contract Number: AC03-84ER51044
• OSTI ID: 7012088
• Report Number(s): GA-A-18418; CONF-860522-23; ON: DE87005237
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
CARBON
CLEANING
CLOSED PLASMA DEVICES
DOUBLET-3 DEVICE
ELECTRIC DISCHARGES
ELEMENTAL MINERALS
ELEMENTS
FIRST WALL
GLOW DISCHARGES
GRAPHITE
LIMITERS
MINERALS
NONMETALS
SHAPE
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
TOKAMAK DEVICES