Spontaneous excitation of geodesic acoustic mode by toroidal Alfv�n eigenmodes

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/107810

Title:	Spontaneous excitation of geodesic acoustic mode by toroidal Alfv�n eigenmodes
Authors:	陳騮;Qiu, Zhiyong;Chen, Liu;Zonca, Fulvio
Contributors:	理學院物理學系
Keywords:	52.30.Gz;52.35.Fp;52.35.Mw;70 PLASMA PHYSICS AND FUSION TECHNOLOGY;ALFVEN WAVES, GEODESIC ACOUSTIC MODE
Date:	2013-02-01
Issue Date:	2026-04-23 14:26:30 (UTC+8)
Publisher:	IOP Publishing Ltd.;United States: EDP Sciences, IOP Publishing and Societ� Italiana di Fisica
Abstract:	摘要： Spontaneous nonlinear excitation of geodesic acoustic mode (GAM) by toroidal Alfvén eigenmodes (TAE) is studied within the framework of gyrokinetic theory. The dispersion relation for the parametric decays of a pump TAE mode into a TAE lower sideband and a GAM is derived. It is shown that, in the ideal MHD first stability region, the condition for spontaneous excitation of GAM by TAEs is ω20 > V2A (4q2R20), in which, ω0 is the pump TAE real frequency, V A is the Alfvén speed, q is the safety factor and R0 is the torus major radius. The corresponding threshold condition is also derived and suggests the decay process as an effective saturation mechanism for TAE. 其他題名： EPL 出版者： United States: EDP Sciences, IOP Publishing and Società Italiana di Fisica 出版日期： 2013-02-01 出處： EPL (Europhysics Letters), 2013-02, Vol.101 (3), p.35001- 資源來源： Institute of Physics Journals 版權： Copyright © EPLA, 2013 識別號： ISSN: 0295-5075 識別號： EISSN: 1286-4854 識別號： DOI: 10.1209/0295-5075/101/35001 識別號： CODEN: EULEEJ
Appears in Collections:	[Department of Physics] journal & Dissertation

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