Work

Fine structure zonal flow excitation by beta-induced Alfvén eigenmode

Year: 2016

Type: article

Abstract: Nonlinear excitation of low frequency zonal structure (LFZS) by beta-induced Alfvén 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.

Source: Nuclear Fusion

DOI: 10.1088/0029-5515/56/10/106013

Authors: Zhiyong Qiu, Liu Chen, Fulvio Zonca

Institutions: Zhejiang University, University of California, Irvine, National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Frascati Research Centre

Language: English

Topic: Magnetic confinement fusion research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: EUROfusion, National Natural Science Foundation of China

Awards: G2789156840, G4545568106, G829439530