Resistive Interchange Modes Destabilized by Helically Trapped Energetic Ions in a Helical Plasma
Resistive Interchange Modes Destabilized by Helically Trapped Energetic Ions in a Helical Plasma
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DOI：
10.1103/physrevlett.114.155003
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发表时间：
2015-04-17
影响因子：
8.6
通讯作者：
Tsuchiya, H.
中科院分区：
文献类型：
--
作者：
Du, X. D.;Toi, K.;Tsuchiya, H.
在强垂直中性束注入的螺旋等离子体中，首次观察到一种新的爆发m = 1/n = 1不稳定性（m； n：极向和环向模数），其频率急剧下降。这是不稳定的等离子体外围区域通过共振相互作用之间的螺旋捕获的高能离子和电阻交换模式。由于该模式增强了捕获的高能离子的径向输运，在边缘附近产生了一个大的径向电场，导致环向等离子体流动的明显变化，抑制了微湍流，并引发了体等离子体约束的改善。
A new bursting m = 1/n = 1 instability (m; n: poloidal and toroidal mode numbers) with rapid frequency chirping down has been observed for the first time in a helical plasma with intense perpendicular neutral beam injection. This is destabilized in the plasma peripheral region by resonant interaction between helically trapped energetic ions and the resistive interchange mode. A large radial electric field is induced near the edge due to enhanced radial transport of the trapped energetic ions by the mode, and leads to clear change in toroidal plasma flow, suppression of microturbulence, and triggering an improvement of bulk plasma confinement.