Neutral-beam-driven impurity flow reversal in tokamaks

Technical Report · Fri Jul 01 04:00:00 EDT 1983

OSTI ID:5769452

Stacey, Jr, W M; Bennett, R B; Sigmar, D J

A theory is outlined which is capable of explaining the observed effects of neutral-beam injection on impurities in tokamak plasmas. In the collisional regime, it is shown for a representative model problem that for sufficiently strong co-injection the outward impurity flux component produced by the radial electric field becomes larger than the inward flux components due to the density gradient, rotation and direct beam-impurity momentum exchange, thereby producing an outward impurity flux. In the mixed regime, a preliminary version of the theory provides a reasonable interpretation of the PLT impurity flow reversal experiments. This preliminary theory, when adjusted to match the PLT results, predicts significant impurity flow reversal in TFTR and in a plasma of the size of FED and INTOR.

• Research Organization: Georgia Inst. of Tech., Atlanta (USA). School of Nuclear Engineering and Health Physics
• DOE Contract Number: AS05-78ET52025
• OSTI ID: 5769452
• Report Number(s): GTFR-42; ON: DE83016153
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700105* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Theoretical-- (-1987)
BEAM INJECTION
CHARGED-PARTICLE TRANSPORT
CLOSED PLASMA DEVICES
COLLISIONAL PLASMA
IMPURITIES
NEUTRAL ATOM BEAM INJECTION
PLASMA
RADIATION TRANSPORT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY