title: Nonlinear dynamics of beta-induced Alfvén eigenmode driven by energetic particles.
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.
authors.affiliation: Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, People's Republic of China.
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: S
authors.initials: S
authors.lastname: Briguglio
authors.forename: L
authors.initials: L
authors.lastname: Chen
authors.forename: C
authors.initials: C
authors.lastname: Di Troia
authors.forename: G
authors.initials: G
authors.lastname: Fogaccia
authors.forename: G
authors.initials: G
authors.lastname: Vlad
authors.forename: F
authors.initials: F
authors.lastname: Zonca