4 papers
Stationary Power-Law Solutions of Kinetic-Alfvénic Turbulence
Kexun Shen, Zhiwen Cheng, Zhiyong Qiu
The wave-kinetic description of weak kinetic-Alfvénic turbulence based on the gyrokinetic theoretical framework is proposed. The wave kinetic equation describing kinetic Alfvén wav…
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…
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…