The influence of the ion polarization current on magnetic island stability in a tokamak plasma
The influence of the ion polarization current on magnetic island stability in a tokamak plasma
复制标题
离子极化电流对托卡马克等离子体磁岛稳定性的影响
DOI：
10.1063/1.2402914
复制
发表时间：
2006
影响因子：
2.2
通讯作者：
F. Militello
中科院分区：
文献类型：
--
作者：
R. Fitzpatrick;F. Waelbroeck;F. Militello
采用二维板几何简化双流体模型，数值研究了离子极化电流对托卡马克等离子体中恒定ψ磁岛稳定性的影响。当岛太窄或太宽时，极化电流可以忽略不计。然而，在某些情况下，存在一个中间区域，在该区域内极化电流是可察觉的，并且对岛屿具有稳定作用。这一效应可能解释了托卡马克等离子体中新经典撕裂模的亚稳性质。
The influence of the ion polarization current on the stability of a constant-ψ magnetic island in a tokamak plasma is investigated numerically using a reduced two-fluid model in two-dimensional slab geometry. The polarization current is found to be negligibly small when the island is either too narrow or too wide. However, under certain circumstances, there exists an intermediate regime in which the polarization current is appreciable, and has a stabilizing influence on the island. This effect may account for the metastable nature of neoclassical tearing modes in tokamak plasmas.