Impact of plasma poloidal rotation on resistive wall mode instability in toroidally rotating plasmas
Impact of plasma poloidal rotation on resistive wall mode instability in toroidally rotating plasmas
复制标题
DOI：
10.1063/1.3551731
复制
发表时间：
2011-02
影响因子：
2.2
通讯作者：
N. Aiba;J. Shiraishi;S. Tokuda
中科院分区：
文献类型：
--
作者：
N. Aiba;J. Shiraishi;S. Tokuda
研究了在圆柱形等离子体和轴对称环形等离子体中，既考虑环向转动又考虑极向转动的阻性壁模的稳定性。由于多普勒频移是影响RWM稳定性的主要因素，极向旋转对多普勒频移的修正会影响RWM的旋转效应。当极向旋转频率不是很大时，极向旋转对RWM稳定性的影响可以用修正的环形旋转频率近似处理。在环形等离子体中，这个修正频率是通过从环形旋转频率中减去平行于磁场的旋转的环形分量来确定的。极向旋转抵消了多普勒频移的影响，大大降低了环形旋转的稳定效果，但通过改变旋转方向，极向旋转增强了这种稳定效果。这一趋势不仅在圆柱形圆柱体上得到证实。
Stability of resistive wall mode (RWM) is investigated in a cylindrical plasma and an axisymmetric toroidal plasma by taking into account not only toroidal rotation but also poloidal rotation. Since the Doppler shifted frequency is responsible for the RWM stability, the modification of this Doppler shifted frequency by poloidal rotation affects the rotation effect on RWM. When a poloidal rotation frequency is not so large, the effect of poloidal rotation on the RWM stability can be approximately treated with the modified toroidal rotation frequency. In a toroidal plasma, this modified frequency is determined by subtracting a toroidal component of the rotation parallel to the magnetic field from the toroidal rotation frequency. The poloidal rotation that counteracts the effect of the Doppler shift strongly reduces the stabilizing effect of toroidal rotation, but by changing the rotational direction, the poloidal rotation enhances this stabilizing effect. This trend is confirmed in not only a cylindrical pl...