Compressional Alfvén eigenmode structure in spherical tokamaks
Compressional Alfvén eigenmode structure in spherical tokamaks
复制标题
球形托卡马克中的压缩结构
DOI：
10.1088/0741-3335/51/7/075001
复制
发表时间：
2009
影响因子：
2.2
通讯作者：
Erwin Verwichte
中科院分区：
文献类型：
--
作者：
H. Smith;Erwin Verwichte
通过求解球托卡马克平衡态下冷等离子体Hall-MHD方程，数值研究了离子回旋频率以下压缩Alfvén本征模（CAEs）的二维结构.最简单的计算本征模具有驻波状的结构和更高的频率的解决方案显示出更多的行波状的行为。研究了本征模方程中的平衡电流项和霍尔项的影响，发现这些项使环模数符号不同的本征模的频率发生偏移。提出了一种分类方案，它将每个球形托卡马克本征模与相应的大长径比圆形截面本征模的三个模数联系起来，这三个模数是通过逐渐减小伸长和增加长径比得到的。
The two-dimensional structure of compressional Alfvén eigenmodes (CAEs) below the ion cyclotron frequency is studied numerically by solving the cold plasma Hall-MHD equations for a realistic spherical tokamak equilibrium. The simplest of the computed eigenmodes have a standing wave-like structure and the higher frequency solutions show a more travelling wave-like behaviour. The effects of the equilibrium current and the Hall terms in the eigenmode equation are investigated, and these terms are found to shift the frequencies of eigenmodes with different sign of the toroidal mode number away from each other. A classification scheme is proposed which relates each spherical tokamak eigenmode to the three mode numbers of the corresponding large aspect ratio circular cross section eigenmode obtained by gradually decreasing the elongation and increasing the aspect ratio.