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Nonlinear dynamics of beta-induced Alfvén eigenmode driven by energetic particles

X. Wang, S. Briguglio, L. Chen, C. Di Troia, G. Fogaccia, G. Vlad, and F. Zonca
Phys. Rev. E 86, 045401(R) – Published 4 October 2012
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Abstract

Nonlinear saturation of a beta-induced Alfvén eigenmode, driven by slowing down energetic particles via transit resonance, is investigated by the nonlinear hybrid magnetohyrodynamic gyrokinetic code. Saturation is characterized by frequency chirping and symmetry breaking between co- and counter-passing particles, which can be understood as the evidence of resonance detuning. The scaling of the saturation amplitude with the growth rate is also demonstrated to be consistent with radial resonance detuning due to the radial nonuniformity and mode structure.

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  • Received 16 March 2012

DOI:https://doi.org/10.1103/PhysRevE.86.045401

©2012 American Physical Society

Authors & Affiliations

X. Wang1, S. Briguglio2, L. Chen1,3, C. Di Troia2, G. Fogaccia2, G. Vlad2, and F. Zonca2,1

  • 1Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, People's Republic of China
  • 2Associazione Euratom-ENEA sulla Fusione, C.P. 65, I-00044 Frascati, Italy
  • 3Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA

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Vol. 86, Iss. 4 — October 2012

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