Nonlinear dynamics of beta induced Alfvén eigenmode driven by energetic particles

Abstract

Nonlinear saturation of beta induced Alfvén 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.

References in corpus (1)

• An extended hybrid magnetohydrodynamics gyrokinetic model for numerical simulation of shear Alfvén waves in burning plasmas

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• Fine Structure Zonal Flow Excitation by Beta-induced Alfven Eigenmode
• Saturation of energetic-particle-driven geodesic acoustic modes due to wave-particle nonlinearity