Energetic-particle modes driven by suprathermal electrons produced by off-axis second harmonic ECRH in compact helical system (CHS)
Energetic-particle modes driven by suprathermal electrons produced by off-axis second harmonic ECRH in compact helical system (CHS)
复制标题
DOI：
10.1088/0029-5515/50/8/084007
复制
发表时间：
2010-08
期刊：
影响因子：
3.3
通讯作者：
M. Isobe;K. Toi;Y. Yoshimura;A. Shimizu;T. Akiyama;K. Ida;T. Minami;C. Suzuki;S. Okamura
中科院分区：
文献类型：
--
作者：
M. Isobe;K. Toi;Y. Yoshimura;A. Shimizu;T. Akiyama;K. Ida;T. Minami;C. Suzuki;S. Okamura
在没有中性束注入的情况下，用二次谐波电子回旋共振加热（ECRH）加热l = 2螺旋等离子体，观察到了周期性的能量粒子模式（EPMs）。观察到的不稳定性的特征在于由一个快速的频率下移，在离子抗磁漂移方向传播。这种爆发的MHD不稳定性只出现在离轴二次谐波ECRH的低密度等离子体中。工作在计数模式的软X射线探测器表明，在低密度ECRH等离子体中存在超热电子，其中EPMs不稳定。EPMs的激发被认为是由于二次谐波ECRH产生的螺旋捕获的超热电子。
Recurrent bursting energetic-particle modes (EPMs) are observed in an l = 2 helical plasma heated by second harmonic electron cyclotron resonance heating (ECRH) without neutral beam injection. The observed instabilities are characterized by a rapid frequency downshift, propagating in the ion-diamagnetic drift direction. Such bursting MHD instabilities are seen only in fairly low-density plasmas with off-axis second harmonic ECRH. A soft x-ray detector operating in the counting mode indicates that there exist suprathermal electrons in low-density ECRH plasmas where EPMs are destabilized. The excitation of EPMs is supposed to be due to the helically trapped suprathermal electrons produced by the second harmonic ECRH.