Convective and diffusive energetic particle losses induced by shear Alfvén waves in the ASDEX upgrade tokamak

M. García-Munoz, N. Hicks, R. Voornveld, van, I.G.J. Classen, R. Bilato, V. Bobkov, M. Bruedgam, H. -U. Fahrbach, V. Igochine, S. Jaemsae, M. Maraschek, K. Sassenheim

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Abstract

We present here the first phase-space characterization of convective and diffusive energetic particle losses induced by shear Alfvén waves in a magnetically confined fusion plasma. While single toroidal Alfvén eigenmodes (TAE) and Alfvén cascades (AC) eject resonant fast ions in a convective process, an overlapping of AC and TAE spatial structures leads to a large fast-ion diffusion and loss. Diffusive fast-ion losses have been observed with a single TAE above a certain threshold in the fluctuation amplitude.
Original languageEnglish
Article number185002
Pages (from-to)185002-1/4
Number of pages4
JournalPhysical Review Letters
Volume104
Issue number18
DOIs
Publication statusPublished - 2010

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