A new paradigm for fast and repetitive chirping of Alfvén eigenmodes

Author:

Cheng Junyi,Zhang WenluORCID,Lin Zhihong,Bao Jian,Dong Chao,Cao Jintao,Li Ding

Abstract

Abstract A novel 2D nonlinear dynamical paradigm is constructed to interpret the fast and repetitive frequency chirping and amplitude oscillation of Alfvén eigenmodes excited by energetic particles in fusion plasmas as observed in global gyrokinetic simulations. In this non-perturbative paradigm of the collisionless phase-space dynamics, wave-particle resonant interactions cause the phase-space structure to continuously twist and fold, leading to the repetitive excitation and decay of the Alfvén eigenmode. The radial (perpendicular to the dominant wave-particle interaction) dependence of the mode amplitude and toroidal precessional drifts of the energetic particles leads to the 2D dynamics of wave-particle interactions, which is found to be responsible for the repetitive process of formation and destruction of the mode structure.

Funder

Strategic Priority Research Program of Chinese Academy of Sciences

Key Research Program of Frontier Science of Chinese Academy of Sciences

National Natural Sci- ence Foundation of China

National MCF Energy R&D program

SciDAC ISEP

Publisher

IOP Publishing

Subject

Condensed Matter Physics,Nuclear and High Energy Physics

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