JT-60U及JT-60SA运行条件下高能量粒子激发的离散阿尔芬本征模  

Discrete Afvén eigenmodes excited by energetic particles in JT-60U and JT-60SA

作　　者：孔冉[1] 胡双辉[1] 王帅[1] 王一如[1] 陈淑平[1] 

机构地区：[1]贵州大学理学院,贵阳550025

出　　处：《核聚变与等离子体物理》2013年第2期113-120,共8页Nuclear Fusion and Plasma Physics

基　　金：托卡马克中低频阿尔芬连续谱及其相关的不稳定性(10975039)

摘　　要：运用线性回旋动力学与磁流体力学的混合模拟程序,研究了JT-60U和JT-60SA装置中高能量粒子对离散阿尔芬本征模的共振激发。发现了丰富的TAE动力学不稳定模式,研究了它的不稳定特性对高能量粒子速度的依赖关系。发现在JT-60U高pELMy H模运行中有grassy ELM的放电比有gaint ELM的放电更容易被高能量粒子激发成不稳定模式,在有边缘L模存在的负剪切运行下的各个势阱中都存在高能量粒子激发的TAE不稳定模式。另外在JT-60SA中高p全非感应电流驱动下的模拟实验放电下也发现了丰富的TAE不稳定模式,观察了TAE在该装置中沿磁场线和径向两个方向的二维广域本征模特性。Resonant excitations of Afven eigenmodes by energetic particles in JT-60U and JT-60SA are investigated employing a gyrokinetic-magnetohydrodynamic （MHD） hybrid simulation code. It is found that multiple branches of ctTAEs can be kinetically destabilized by energetic particles. The dependences of stability properties on energetic-particle beam velocity via resonance conditions are examined. The discrete Afven eigenmodes in high tip grassy ELM H mode regime are easier to be excited by energetic particles than in high βp gaint ELM H mode regime. The discrete Afven eigenmodes excited by energetic particles are shown to exist in diffrent potential wells in reversed magnetic shear discharges with an L-mode edge. The kinetically excited αTAE instabilities are also found in high βp full non-inductive operation in JT-60SA. The global αTAE features are demonstrated along the magnetic field line and the radial direction.

关 键 词：阿尔芬波 高能量粒子 托卡马克 不稳定性 

分 类 号：TL612.2[核科学技术—核技术及应用]