Impurity transport in tokamaks in the plateau to Pfirsch--Schlueter regimes

Journal Article · Sat Jan 01 00:00:00 EST 1977 · Phys. Fluids; (United States)

OSTI ID:7327677

Chu, M S; Rawls, J M; Wong, S K; Hinton, F L

Neoclassical transport coefficients for ion and impurity species are computed in a large aspect ratio toroidal magnetic confinement system for intermediate-to-high collision frequencies. A large range of values of the relevant density and charge parameters is explored and terms of order (m/sub i//m/sub I/)/sup 1///sup 2/ are retained. The behavior of the transport coefficients is found to depend on the collisionality of both the ions and the impurities. A simple approximate analytic representation of these results which incorporates the correct asymptotic plateau and Pfirsch--Schlueter behavior is presented. In the plateau regime, when (n/sub I//n/sub i/)(m/sub I//m/sub i/)/sup 1///sup 2/very-much-less-than1, the inward impurity flux is found to be suppressed for experimentally obtainable plasma parameters, implying that the time scale for impurity concentration could be too long to be observable. (AIP)

• Research Organization: General Atomic Company, San Diego, California 92138
• OSTI ID: 7327677
• Journal Information: Phys. Fluids; (United States), Vol. 20:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TOKAMAK DEVICES
PLASMA DRIFT
COLLISIONAL PLASMA
IMPURITIES
KINETIC EQUATIONS
TOROIDAL CONFIGURATION
ANNULAR SPACE
CLOSED PLASMA DEVICES
CONFIGURATION
EQUATIONS
PLASMA
THERMONUCLEAR DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production
700105 - Fusion Energy- Plasma Research- Plasma Kinetics-Theoretical- (-1987)