托卡马克中的离散阿尔芬本征模  

Discrete Alfvéneigen Modes in Tokamaks

作　　者：吴昊 胡双辉 何秋明 赵子龙 蒋丽 WU Hao;HU Shuanghui;HE Qiuming;ZHAO Zilong;JIANG Li(College of Physics,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学物理学院,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2018年第3期44-51,共8页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目(11645004;11275053);贵州大学研究生创新基金项目(研理工2017035)

摘　　要：托卡马克中的离散阿尔芬本征模(即αTAE,α是等离子体压强梯度的标度参数)是一种准边缘稳定模式,它们在燃烧等离子体条件下易受高能量粒子激发而演变成为不稳定模式,因之潜在影响托卡马克的稳态运行。本文在(s,α)平衡模型下,探讨了αTAE的存在区域及其相关的稳定性特征,并通过磁流体力学计算以及回旋动理学-磁流体力学混合模模拟来演示多支αTAE的结构特点,且进一步探讨在粒子共振激发下的不稳定现象,另外,在此基础上,结合具体托卡马克装置,分析αTAE在不同条件下的不稳定表现,为后续研究提供有益参考。Discrete Alfvéneigen modes（ i.e.,αTAE,with α being a measure of plasma pressure gradient）,within the magnetohydrodynamic（ MHD） description,are quasi-marginally stable modes,which can be readily destabilized by energetic particles in burning plasmas. These kinetically unstable modes could potentially affect steadystate operations of tokamaks. In this paper,the stability features of αTAEs were delineated upon the（ s,α） equilibrium model. Their multiple branches were demonstrated with MHD computations as well as MHD-gyrokinetic hybrid simulations. The kinetic excitations were presented for the αTAEs via wave-particle resonances. TheseαTAE instabilities were also discussed for varied tokamaks.

关 键 词：阿尔芬波 等离子体不稳定性 高能量粒子 托卡马克 

分 类 号：O534[理学—等离子体物理]