Nonlinear dynamics of beta induced Alfvén eigenmode driven by energetic particles

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

2012-03-16

arxiv.org/abs/1203.3769v1

Physics

Plasma Physics

Scientific paper

Nonlinear saturation of beta induced Alfv\'en eigenmode, driven by slowing down energetic particles via transit resonance, is investigated by the nonlinear hybrid magnetohyrodynamic gyro-kinetic code (XHMGC). Saturation is characterized by frequency chirping and symmetry breaking between co- and counter-passing particles, which can be understood as the 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 non-uniformity and mode structure.

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