Effect of sheared flow on magnetic islands
Effect of sheared flow on magnetic islands
复制标题
DOI：
10.1063/1.2434251
复制
发表时间：
2007-02
影响因子：
2.2
通讯作者：
F. Waelbroeck;R. Fitzpatrick;D. Grasso
中科院分区：
文献类型：
--
作者：
F. Waelbroeck;R. Fitzpatrick;D. Grasso
本文研究了剪切流对磁岛的影响。在相反的密度和温度梯度，这是平坦的足够宽的岛屿，它被发现，速度梯度内的分界线保持不变，只要常数近似是满意的。由此可见，在这种近似下，速度切变对岛振幅的影响可以忽略不计。违反常数近似的影响进行了探讨，通过使用开尔文-斯图尔特家族的岛屿，它被发现，扁平化是适度的，即使当分界线包围几乎所有的电流。
The effect of sheared flow on a magnetic island is examined. In contrast to the density and temperature gradients which are flattened for sufficiently wide islands, it is found that the velocity gradient persists inside the separatrix whenever the constant-ψ approximation is satisfied. It follows that velocity shear has a negligible effect on island amplitude in that approximation. The effect of the violation of the constant-ψ approximation is explored by using the Kelvin-Stuart family of islands, and it is found that flattening is modest even when the separatrix encloses virtually all the current.