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

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-pass...

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Published inPhysical review. E, Statistical, nonlinear, and soft matter physics Vol. 86; no. 4 Pt 2; p. 045401
Main Authors Wang, X, Briguglio, S, Chen, L, Di Troia, C, Fogaccia, G, Vlad, G, Zonca, F
Format Journal Article
LanguageEnglish
Published United States 01.10.2012
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Summary: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.
ISSN:1550-2376
DOI:10.1103/PhysRevE.86.045401