Simulation study of nonlocal transport from edge to core in tokamak plasmas
Simulation study of nonlocal transport from edge to core in tokamak plasmas
复制标题
托卡马克等离子体从边缘到核心的非局域输运模拟研究
DOI：
10.1002/ctpp.201410042
复制
发表时间：
2014
影响因子：
1.6
通讯作者：
N. Miyato and T. Takizuka
中科院分区：
文献类型：
--
作者：
M. Yagi;A. Matsuyama;N. Miyato and T. Takizuka
利用4场简化MHD模型对托卡马克等离子体从边缘到核心的非局部输运进行了模拟研究。在达到阻性气球湍流的饱和后，在等离子体边缘应用了一个环形拉长的圆柱形粒子源。短时间后，关闭源，详细研究等离子体响应。非局域输运出现在远离边缘源的位置。发现粒子源诱导出（0,0）和（±1,0）两种密度波动模式，其中（m, n）表示极向模态数和环向模态数的集合。这些模式通过非线性和/或环面耦合相互作用。（±1,0）模式的对称性在关闭源后被打破，并且观察到具有极向旋转的螺旋结构的形成，这产生了核心和边缘区域之间的连接。在此模拟中，（1,0）模式等对流单元模式对非局部输运有贡献。仿真结果表明，二维输运对非局部输运的产生起着至关重要的作用。（©2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim）
The simulation study of nonlocal transport from edge to core in tokamak plasmas is performed using the 4‐field reduced MHD model. A toroidally‐elongated cylindrical particle source is applied in the plasma edge, after saturation of the resistive ballooning turbulence is attained. After a short time, the source is switched off and plasma response is investigated in detail. The nonlocal transport appears at the location far from the edge source. It is found that the particle source induces (0,0) and (±1, 0) modes of density fluctuations, where (m, n) indicates the set of poloidal mode numbermand the toroidal mode numbern. These modes interact with each other by the nonlinear and/or toroidal couplings. The symmetry of (±1, 0) modes breaks after switching‐off the source and the formation of the spiral structure with poloidal rotation is observed, which yields a connection between core and edge regions. In this simulation, the convective cell mode such as (1,0) mode contributes the nonlocal transport. The simulation result indicates that two dimensional transport plays an essential role to produce the nonlocal transport. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)