Effects of plasma nonuniformity on toroidal Alfvén eigenmode nonlinear decay

被引：0
|
作者：
Cheng, Zhiwen [1 ]
Shen, Kexun [1 ]
Qiu, Zhiyong [2 ,3 ]
机构：
[1] Zhejiang Univ, Inst Fus Theory & Simulat, Sch Phys, Hangzhou, Peoples R China
[2] Inst Plasma Phys, Chinese Acad Sci, Key Lab Frontier Phys Controlled Nucl Fus, Hefei 230031, Peoples R China
[3] Ctr Nonlinear Plasma Sci & CR ENEA Frascati, CP 65, I-00044 Frascati, Italy
来源：
NUCLEAR FUSION | 2024年 / 64卷 / 06期
基金：
美国国家科学基金会;
关键词：
toroidal Alfv & eacute; n eigenmode; nonlinear mode coupling; gyrokinetic theory; parametric decay instability; ion induced scattering; ENERGETIC PARTICLES; ALFVEN EIGENMODES; ALPHA-PARTICLES; SATURATION; WAVES; SHEAR; EXCITATION; DYNAMICS;
D O I：
10.1088/1741-4326/ad43fc
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The parametric decay of toroidal Alfv & eacute;n eigenmode (TAE) in nonuniform plasmas is investigated using nonlinear gyrokinetic equation. It is found that, the plasma nonuniformity not only significantly enhances the nonlinear coupling cross-section, but also qualitatively modifies the decay process. Specifically, the condition for spontaneous decay becomes the toroidal mode number of the sideband TAE being higher than that of the pump TAE, instead of the frequency of the sideband TAE being lower than the pump TAE in uniform plasmas. The consequences on TAE saturation and energetic particle transport are also discussed.
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页数：8
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