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Ripple transport at low collision frequency

Published online by Cambridge University Press:  13 March 2009

W. N. G. Hitchon ,
C. D. Beidler ,
H. E. Mynick  and
J. L. Shohet
W. N. G. Hitchon
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin, Madison, Wisconsin 53706
C. D. Beidler
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin, Madison, Wisconsin 53706
H. E. Mynick
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin, Madison, Wisconsin 53706
J. L. Shohet
Affiliation:
Torsatron/Stellarator Laboratory, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

A new stellarator ripple-transport mechanism is predicted at the low collision frequencies characteristic of ions in a reactor plasma. A heuristic argument is used to derive an approximate diffusion coefficient whose magnitude, scaling and range of applicability agree well with the results of Monte Carlo calculations. The proposed diffusion coefficient is independent of collision frequency within its range of validity, which encompasses the parameters of most ions in a reactor. Its magnitude is smaller than previous estimates for the diffusion coefficient in this range, but larger than the diffusion coefficients in all other low-collision-frequency regimes. An explanation of the form of the diffusion coefficient is given in terms of analytic theory of ripple transport.

Type
Research Article
Information
Journal of Plasma Physics , Volume 34 , Issue 2 , October 1985 , pp. 327 - 336
Copyright
Copyright © Cambridge University Press 1985

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References

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