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Effects of trapped alpha particles on internal kink modes in tokamaks

Published online by Cambridge University Press:  13 March 2009

P. Helander  and
M. Lisak
P. Helander
Affiliation:
Institute for Electromagnetic Field Theory and Plasma Physics, Chalmers University of Technology, S-412 96 Goteborg, Sweden
M. Lisak
Affiliation:
Institute for Electromagnetic Field Theory and Plasma Physics, Chalmers University of Technology, S-412 96 Goteborg, Sweden
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Abstract

The theory of linear interaction between internal kink modes and fusionproduced high-energy alpha particles in a toroidal plasma is extended by including finite-banana-width corrections to the alpha dynamics. An important implication of the theory for the stability properties of kink modes is that the finite-banana-width effects increase the value of the poloidal alpha beta required to attain the stable domain of operation as well as that required to excite the high-frequency fishbone instability. Furthermore, these effects lead to a reduction in the instability growth rate in both the low- and high-frequency unstable regimes.

Type
Research Article
Information
Journal of Plasma Physics , Volume 47 , Issue 2 , April 1992 , pp. 281 - 293
Copyright
Copyright © Cambridge University Press 1992

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