Poloidal rotation effects on a simulated resistive kink mode
Poloidal rotation effects on a simulated resistive kink mode
复制标题
DOI：
10.1063/1.1326062
复制
发表时间：
2001
影响因子：
2.2
通讯作者：
M. Kissick;J. Leboeuf;S. Cowley;J. Dawson
中科院分区：
文献类型：
--
作者：
M. Kissick;J. Leboeuf;S. Cowley;J. Dawson
通过主要使用简化的磁流体动力学版本的有限展弦比代码[L。A.查尔顿等人，J.计算机Phys.86，270（1990）]，m/n=1/1的电阻性扭结模式在伴随旋转剪切的情况下极轴旋转。据观察，这种不稳定模式的增长率可以减少或增加所施加的平衡旋转增加到近极向音速。极向旋转剖面中的剪切是稳定的，但只有当体旋转的不稳定效应可以被克服时。因此，该模式的稳定性是敏感的旋转的峰值相对于本征模式的空间范围的位置。体旋转的不稳定的影响显然是一个旋转增强的β，和稳定的影响似乎是由超过一个临界的旋转剪切空间平均的本征模结构。
Through the principal use of the reduced magnetohydrodynamic version of the finite aspect ratio code [L. A. Charlton et al., J. Comput. Phys. 86, 270 (1990)], an m/n=1/1 resistive kink mode was poloidally rotated with the accompanying rotational shear. It was observed that the growth rate of this unstable mode can either decrease or increase as the applied equilibrium rotation is increased to near poloidal sonic speeds. Shear in the poloidal rotation profile is stabilizing, but only if the destabilizing effects of bulk rotation can be overcome. Therefore, the mode’s stability was sensitive to the location of the rotation’s peak relative to the eigenmode’s spatial extent. The destabilizing effects of bulk rotation are apparently a rotationally enhanced beta, and the stabilizing effects appear to be caused by exceeding a critical rotational shear spatially averaged over the eigenmode structure.