Beam Distribution Modification By Alfven Modes
Authors: R. B. White, N. Gorelenkov, W. W. Heidbrink, and M.A. Van Zeeland
Abstract:
Modification of a deuterium beam distribution in the presence of low amplitude Toroidal Alfven (TAE) eigenmodes and Reversed Shear Alfven (RSAE) eigenmodes in a toroidal magnetic confinement device is examined. Comparison with experimental data shows that multiple low amplitude modes can account for significant modification of high energy beam particle distributions. It is found that there is a stochastic threshold for beam transport, and that the experimental amplitudes are only slightly above this threshold. The modes produce a substantial central flattening of the beam distribution.
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Accepted to: Physics of Plasmas, November 2009
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Download PPPL-4483 (pdf 201 KB 12 pp)
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