Fine Structure Zonal Flow Excitation by Beta-induced Alfven Eigenmode
Plasma Physics
2016-12-13 v1
Abstract
Nonlinear excitation of low frequency zonal structure (LFZS) by beta-induced Alfven eigenmode (BAE) is investigated using nonlinear gyrokinetic theory. It is found that electrostatic zonal flow (ZF), rather than zonal current, is preferentially excited by finite amplitude BAE. In addition to the well-known meso-scale radial envelope structure, ZF is also found to exhibit fine radial structure due to the localization of BAE with respect to mode rational surfaces. Specifically, the zonal electric field has an even mode structure at the rational surface where radial envelope peaks.
Cite
@article{arxiv.1605.04618,
title = {Fine Structure Zonal Flow Excitation by Beta-induced Alfven Eigenmode},
author = {Zhiyong Qiu and Liu Chen and Fulvio Zonca},
journal= {arXiv preprint arXiv:1605.04618},
year = {2016}
}
Comments
to be submitted to Nuclear Fusion