On nonlinear scattering of drift wave by toroidal Alfven eigenmode in tokamak plasmas

被引：12

作者：

Chen, Liu ^{[1
,2
,3
,4
]}

Qiu, Zhiyong ^{[1
,3
,4
]}

Zonca, Fulvio ^{[1
,3
,4
]}

机构：

[1] Zhejiang Univ, Inst Fus Theory & Simulat, Sch Phys, Hangzhou, Peoples R China

[2] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[3] Ctr Nonlinear Plasma Sci, CP 65, I-00044 Frascati, Italy

[4] CR ENEA Frascati, CP 65, I-00044 Frascati, Italy

来源：

NUCLEAR FUSION | 2023年 / 63卷 / 10期

基金：

美国国家科学基金会;

关键词：

toroidal Alfven eigenmode; burning plasma; drift wave; nonlinear mode coupling; gyrokinetic theory; KINETIC-THEORY; MODES;

D O I：

10.1088/1741-4326/acf230

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：

Using electron drift wave (eDW) as a paradigm model, we have investigated analytically direct wave-wave interactions between a test DW and ambient toroidal Alfven eigenmodes (TAEs) in toroidal plasmas, and their effects on the stability of the eDW. The nonlinear effects enter via scatterings to short-wavelength electron Landau damped kinetic Alfven waves (KAWs). Specifically, it is found that scatterings to upper-sideband KAW lead to stimulated absorption of eDW. Scatterings to the lower-sideband KAW, on the contrary, lead to its spontaneous emission. As a consequence, for typical parameters and fluctuation intensity, nonlinear scatterings by TAEs have negligible net effects on the eDW stability; in contrast to the 'reverse' process investigated in Chen et al (2022 Nucl. Fusion 62 094001), where it is shown that nonlinear scattering by ambient eDWs may lead to significant damping of TAE.

引用

页数：8

共 32 条

[1] Theoretical interpretation of Alfven cascades in tokamaks with nonmonotonic q profiles -: art. no. 185002 [J].