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Bootstrap-current computations for a stellarator-reactor plasma

Published online by Cambridge University Press:  13 March 2009

W. D. D'Haeseleer ,
W. N. G. Hitchon ,
C. D. Beidler  and
J. L. Shohet
W. D. D'Haeseleer
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin-Madison, Madison, Wisconsin 53706, U.S.A.
W. N. G. Hitchon
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin-Madison, Madison, Wisconsin 53706, U.S.A.
C. D. Beidler
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin-Madison, Madison, Wisconsin 53706, U.S.A.
J. L. Shohet
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin-Madison, Madison, Wisconsin 53706, U.S.A.
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Abstract

Numerical results for the bootstrap current in a stellarator-reactor plasma are presented. The distribution function f is computed numerically from a kinetic equation that is averaged over the helical ripple. The parallel flows and the current are obtained as v‖ moments of f. The physics issues embedded in the code are discussed concisely, concentrating on the justification as to why the bootstrap current can be estimated from an averaged scheme. Results are presented for typical stellarator-reactor parameters. The numerical code FLOCS predicts that the momentum-restoring terms in the collision operator have no significant impact on the value of the bootstrap current (the difference being about 10%). The results obtained are related to the equilibrium flows, and a physical interpretation based on the kinetic picture is presented. Finally, an estimate for the impact of J‖ on the rotational transform is given.

Type
Research Article
Information
Journal of Plasma Physics , Volume 44 , Issue 3 , December 1990 , pp. 431 - 453
Copyright
Copyright © Cambridge University Press 1990

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