Stabilization of the resistive shell mode in tokamaks
Stabilization of the resistive shell mode in tokamaks
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DOI：
10.1088/0029-5515/36/1/i02
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发表时间：
1996
期刊：
影响因子：
3.3
通讯作者：
R. Fitzpatrick;A.Y. Aydemir
中科院分区：
文献类型：
--
作者：
R. Fitzpatrick;A.Y. Aydemir
研究了电导率有限的托卡马克等离子体中电流驱动外扭结模的稳定性。根据传统理论，理想模可以通过将壳层放置在离等离子体足够近的位置来稳定，但随着壳层的特征L/R时间的增长，非旋转的“电阻壳层模型”始终存在。用解析和数值方法证明了强边缘等离子体旋转和等离子体内部某处的耗散相结合能够稳定电阻壳模。这种稳定机制类似于Bondeson和Ward(1994)最近发现的机制，只是它不一定依赖于环性、等离子体可压缩性或等离子体内部共振表面的存在。阐明了阻性壳模稳定的一般要求
The stability of current-driven external-kink modes is investigated in a tokamak plasma surrounded by an external shell of finite electrical conductivity. According to conventional theory, the ideal mode can be stabilized by placing the shell sufficiently close to the plasma, but the non-rotating `resistive shell mode`, which grows as the characteristic L/R time of the shell, always persists. It is demonstrated, using both analytic and numerical techniques, that a combination of strong edge plasma rotation and dissipation somewhere inside the plasma is capable of stabilizing the resistive shell mode. This stabilization mechanism is similar to that found recently by Bondeson and Ward (1994), except that it does not necessarily depend on toroidicity, plasma compressibility or the presence of resonant surfaces inside the plasma. The general requirements for the stabilization of the resistive shell mode are elucidated