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Phys. Rev. Lett. 104, 185002 (2010) [4 pages]

Convective and Diffusive Energetic Particle Losses Induced by Shear Alfvén Waves in the ASDEX Upgrade Tokamak

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M. García-Muñoz1,*, N. Hicks1, R. van Voornveld2, I. G. J. Classen1,2, R. Bilato1, V. Bobkov1, M. Bruedgam1, H.-U. Fahrbach1, V. Igochine1, S. Jaemsae3, M. Maraschek1, K. Sassenberg1, and ASDEX Upgrade Team
1Max-Planck-Institut für Plasmaphysik, EURATOM Association Boltzmannstraße 2, D-85748 Garching, Germany
2FOM-Institute for Plasma Physics Rijnhuizen, Association EURATOM-FOM, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands
3Helsinki University of Technology, Association Euratom-Tekes, P.O. Box 4100, FIN-02015 HUT, Finland

Received 28 December 2009; published 6 May 2010

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.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.185002
DOI:
10.1103/PhysRevLett.104.185002
PACS:
52.55.Pi, 52.35.Bj

*Manuel.Garcia-Munoz@ipp.mpg.de

 
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