Effect of a poloidal electric field on neoclassical transport in a multispecies tokamak plasma

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860822· OSTI ID:6769082

Indireshkumar, K; Stacey, Jr, W M ^[1]

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1. Fusion Research Center, Nuclear Engineering Program, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)

The effects of a poloidal potential variation of order [epsilon], which is likely to be produced during high-power cyclotron wave heating or neutral beam injection, upon neoclassical particle transport and plasma current are studied theoretically, for a realistic tokamak plasma with significant impurity content. Using an approximate collision operator, an analytic procedure is employed to calculate the transport coefficients in the low collisionality regime for a large aspect ratio tokamak. In the presence of carbon impurity, the ion diffusion coefficients are generally found to increase by a factor of [similar to]2. Inclusion of the effects of a poloidal electric field is found to result in an increase in the bootstrap current if the potential on the outside of the tokamak is greater than that on the inside [as during ion cyclotron resonance heating (ICRH) or neutral beam injection (NBI)] and the density profiles are more peaked than roughly the square root of the temperature profiles.

• DOE Contract Number: FG05-87ER52141
• OSTI ID: 6769082
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:6; ISSN PFBPEI; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330* -- Plasma Kinetics
Transport
& Impurities-- (1992-)
BANANA REGIME
CARBON
CLOSED PLASMA DEVICES
COLLISIONAL PLASMA
CYCLOTRON RESONANCE
DIFFUSION
ELECTRIC FIELDS
ELECTRON CYCLOTRON-RESONANCE
ELEMENTS
IMPURITIES
ION CYCLOTRON-RESONANCE
NEOCLASSICAL TRANSPORT THEORY
NONMETALS
PLASMA
RESONANCE
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY
TRAPPING