Effect of a poloidal electric field on neoclassical transport in a multispecies tokamak plasma
The effects of a poloidal potential variation of or der c[var epsilon], 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 [approximately] 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 ICRH or NBI) and the density profiles are more peaked than roughly the square root of the temperature profiles.
- Research Organization:
- Georgia Inst. of Tech., Atlanta, GA (United States). Fusion Research Center
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG05-87ER52141
- OSTI ID:
- 6742695
- Report Number(s):
- GTFR-106; ON: DE93008144
- Country of Publication:
- United States
- Language:
- English
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Effect of a poloidal electric field on neoclassical transport in a multispecies tokamak plasma
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Related Subjects
TOKAMAK DEVICES
NEOCLASSICAL TRANSPORT THEORY
ASPECT RATIO
BANANA REGIME
BOOTSTRAP CURRENT
CARBON IONS
DISTRIBUTION FUNCTIONS
ECR HEATING
ELECTRIC FIELDS
PLASMA IMPURITIES
TEMPERATURE DISTRIBUTION
CHARGED PARTICLES
CLOSED PLASMA DEVICES
CURRENTS
ELECTRIC CURRENTS
FUNCTIONS
HEATING
HIGH-FREQUENCY HEATING
IMPURITIES
IONS
PLASMA HEATING
THERMONUCLEAR DEVICES
TRANSPORT THEORY
TRAPPING
700330* - Plasma Kinetics
Transport
& Impurities- (1992-)