Saturation of Alfven modes in tokamaks

Authors: R. White, N. Gorelenkov, M. Gorelenkova, M. Podesta, S. Ethier, and Y. Chen

Abstract:  Growth of Alfven modes driven unstable by a distribution of high energy particles up to saturation is investigated with a guiding center code, using numerical eigenfunctions produced by linear theory and a numerical high energy particle distribution, in order to make detailed comparison with experiment and with models for saturation amplitudes and the modification of beam profiles. Two innovations are introduced. First, a very noise free means of obtaining the mode-particle energy and momentum transfer is introduced, and secondly, a spline representation of the actual beam particle distribution is used.
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Download PPPL-5257 (pdf 4.8 MB 30 pp)
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