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

Journal Article · Sat Jan 01 04:00:00 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), Journal Name: Phys. Fluids; (United States) Vol. 20:1; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

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