4 papers · 1 filter
Nonlinear saturation of reversed shear Alfven eigenmode via high-frequency quasi-mode generation
Zhiwen Cheng, Guangyu Wei, Lei Ye +1
A nonlinear saturation mechanism for reversed shear Alfven eigenmode (RSAE) is proposed and analysed, and is shown to be of relevance to typical reactor parameter region. The satur…
Saturation of fishbone instability through zonal flows driven by energetic particle transport in tokamak plasmas
G. Brochard, C. Liu, X. Wei +17
Gyrokinetic and kinetic-MHD simulations are performed for the fishbone instability in the DIII-D discharge #178631, chosen for validation of first-principles simulations to predict…
Effects of plasma nonuniformity on toroidal Alfvén eigenmode nonlinear decay
Zhiwen Cheng, Kexun Shen, Zhiyong Qiu
The parametric decay of toroidal Alfvén eigenmode (TAE) in nonuniform plasmas is investigated using nonlinear gyrokinetic equation. It is found that, the plasma nonuniformity not o…
Resonant Decay of Kinetic Alfvén Waves and Implication on Spectral Cascading
Kexun Shen, Zhiwen Cheng, Zhiyong Qiu
A general equation describing the resonant nonlinear mode-coupling among kinetic Alfvén waves (KAWs) is derived using nonlinear gyrokinetic theory, which can be applied to study th…