Role of Hall effect on the resistive kink mode in tokamaks
Role of Hall effect on the resistive kink mode in tokamaks
复制标题
霍尔效应对托卡马克电阻扭结模式的作用
DOI：
10.1088/1361-6587/ab60ff
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发表时间：
2020-01
影响因子：
2.2
通讯作者：
Wang X.
中科院分区：
文献类型：
--
作者：
Zhang W.;Ma Z. W.;Zhang H. W.;Wang X.
用三维环形Hall MHD程序CLT数值研究了Hall效应对m/n = 1/1连续扭结模非线性演化的影响。结果表明，霍尔效应可以导致连续扭结模在非线性阶段的爆发式增长。在Hall-MHD模拟中，连续扭结模的爆炸性非线性增长主要是由电流片的结构转变引起的。在非线性阶段，电流片的几何形状由Y型变为X型，导致重联过程显著加速。霍尔效应引起的快速重联可以解释在大型托卡马克中观察到的快速碰撞。我们还发现存在一个离子惯性长度的临界值，这是由于霍尔磁流体中离子和电子的退耦运动加速了磁重联，以及电子的抗磁旋转对磁重联的抑制作用。随着导热系数κ ε的增大，临界值di减小。当di超过一个临界值时，峰值增长率随di的增大而减小.
The influence of the Hall effect on the nonlinear evolution of the m/n = 1/1 resistive-kink mode is numerically investigated by the three-dimensional toroidal Hall-MHD code CLT. It is found that the Hall effect can lead to the explosive growth of the resistive-kink mode at the nonlinear stage. The explosive nonlinear growth of the resistive-kink mode mainly results from the structural transition of the current sheet in the Hall-MHD simulations. At the nonlinear stage, the geometry of the current sheet turns into X-type from Y-type, resulting in the significant acceleration of the reconnection process. The fast reconnection induced by the Hall effect may explain the fast crash observed in large tokamaks. We also found that there exists a critical value of the ion inertial length that is resulted from the acceleration of magnetic reconnection due to the decoupling motions of ions and electrons and the suppression effect by the electron diamagnetic rotation in the Hall MHD. The critical value of d i decreases with increasing thermal conductivity κ ⊥ . When d i exceeds a critical value, the peak growth rate decreases with increasing d i .
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影响因子：
8.6
作者：
Xiaogang Wang;A. Bhattacharjee
通讯作者：
Xiaogang Wang;A. Bhattacharjee
影响因子：
4.1
作者：
C. Cheng;M. Chance
通讯作者：
C. Cheng;M. Chance
影响因子：
--
作者：
Xiaogang Wang;Ashis Bhattacharjee;Zhiwei Ma
通讯作者：
Xiaogang Wang;Ashis Bhattacharjee;Zhiwei Ma
影响因子：
2.2
作者：
I. Krebs;S. Jardin;S. Gunter;K. Lackner;M. Hoelzl;E. Strumberger;N. F. M. R. C. F. P. Physics-N.-F.-M.-R.-C.-F.-P.-Physics-2140458829;Princeton Plasma Physics Laboratory;Princeton;Nj;Usa;Max Planck Institute for extraterrestrial Physics;Garching;H Germany
通讯作者：
I. Krebs;S. Jardin;S. Gunter;K. Lackner;M. Hoelzl;E. Strumberger;N. F. M. R. C. F. P. Physics-N.-F.-M.-R.-C.-F.-P.-Physics-2140458829;Princeton Plasma Physics Laboratory;Princeton;Nj;Usa;Max Planck Institute for extraterrestrial Physics;Garching;H Germany
影响因子：
3.3
作者：
R. Fischer;A. Bock;A. Burckhart;O. Ford;L. Giannone;V. Igochine;M. Weiland;M. Willensdorfer
通讯作者：
R. Fischer;A. Bock;A. Burckhart;O. Ford;L. Giannone;V. Igochine;M. Weiland;M. Willensdorfer