摘要： 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. 其他題名： NF 其他題名： Nucl. Fusion 出版者： IOP Publishing 出版日期： 2016-10-01 出處： Nuclear Fusion, 2016-10, Vol.56 (10), p.106013 資源來源： Institute of Physics Journals 版權： 2016 IAEA, Vienna 識別號： ISSN: 0029-5515 識別號： EISSN: 1741-4326 識別號： DOI: 10.1088/0029-5515/56/10/106013 識別號： CODEN: NUFUAU
