JET运行条件下高能量粒子激发的离散阿尔芬本征模  

Discrete Alfvén eigenmodes excited by energetic particles in JET

作　　者：王帅[1] 龙超云[1] 胡双辉[1] 孔冉[1] 陈淑平[1] 王一如[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4期304-311,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资助项目(10975039)

摘　　要：运用线性回旋动力学与磁流体力学的混合数值程序,研究了JET装置运行条件下高能量粒子对离散阿尔芬本征模的共振激发,发现高能粒子能激发丰富的αTAE动理学不稳定模式。讨论了高能量粒子压强及速度对共振激发的影响。研究了较低和较高自举电流运行状态以及不同环向场波纹度条件下αTAE被高能量粒子激发的物理特性。探讨了ELMs与ITB共存状态下高能量粒子激发多支离散阿尔芬本征模的情形。发现αTAE频谱广阔,且随着共振条件的变化,无论低阶还是高阶的αTAE都可以被高能量粒子激发成不稳定模式。这种潜在的阿尔芬不稳定性值得深入的研究,应当结合更多托卡马克装置的运行条件讨论其激发及物理特征。Resonant excitations of Alfvén eigenmodes by energetic particles in JET operation are investigated employing a gyrokinetic-magnetohydrodynamic（MHD） hybrid simulation code. Multiple branches of αTAEs can be kinetically destabilized by engetic particles. The influence to the resonant excitation which comes from energetic particle pressure and velocity is investigated. The physical characteristics of αTAE excited by energetic particles are investigated in different bootstrap current operation status as well as in distinct toroidal field ripple amplitude. We find that multiple branches of αTAEs are excited by energetic particles in ELMs regime compatible with ITB. It is showed that αTAE has a wide frequency spectrum and the isntability modes both higher-order and low-order αTAEs can be excited in various resonance conditions. It＇s valuable to explore this kind of potential Alfvén instability, so its excitation and physical characteristics should be investigated under more operating condition in tokamak.

关 键 词：阿尔芬波 高能量粒子 托卡马克 不稳定性 

分 类 号：O436[机械工程—光学工程]