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Title: Collisional dependence of Alfven mode saturation in tokamaks
Contributors: Zhou, M.
White, R.
U. S. Department of Energy contract number DE-AC02-09CH11466
Keywords: TAE modes
Issue Date: 2016
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Plasma Physics and Controlled Fusion
Abstract: Saturation of \alfven modes driven unstable by a distribution of high energy particles as a function of collisionality is investigated with a guiding center code, using numerical eigenfunctions produced by linear theory and numerical high energy particle distributions. The most important resonance is found and it is shown that when the resonance domain is bounded, not allowing particles to collisionlessly escape, the saturation amplitude is given by the balance of the resonance mixing time with the time for nearby particles to collisionally diffuse across the resonance width. Saturation amplitudes are in agreement with theoretical predictions as long as the mode amplitude is not so large that it produces stochastic loss from the resonance domain.
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