论文标题
与岛分流的恒星中血浆湍流的全球流体模拟
Global fluid simulation of plasma turbulence in a stellarator with an island divertor
论文作者
论文摘要
提出了带有岛分向的5场时期恒星剂的三维，通量驱动的，静电，全局，两流体湍流模拟的结果。使用GBS代码进行数值模拟，最近扩展以模拟非轴对称磁平衡中的血浆湍流。模拟中使用的真空磁场是用dommaschk电位理论产生的，并描述了带有嵌套通量表面的中央区域的配置，并被磁岛链包围，类似于W7-X的分离配置。从核心流出的热量到达岛屿区域，并沿着磁岛运输，撞击了容器壁，这对应于模拟域的边界。 发现颗粒和热量的径向运输主要是由磁场数字$ m = 4 $的野外一致的连贯模式驱动的。基于非本地线性理论考虑的该模式的分析显示了其气囊的性质。与Tokamak的模拟和实验相反，斑点经常有助于运输，我们不观察到间歇性运输事件的存在。
Results of a three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulation for a 5-field period stellarator with an island divertor are presented. The numerical simulation is carried out with the GBS code, recently extended to simulate plasma turbulence in non-axisymmetric magnetic equilibria. The vacuum magnetic field used in the simulation is generated with the theory of Dommaschk potentials, and describes a configuration with a central region of nested flux surfaces, surrounded by a chain of magnetic islands, similarly to the diverted configurations of W7-X. The heat outflowing from the core reaches the island region and is transported along the magnetic islands, striking the vessel walls, which correspond to the boundary of the simulation domain. The radial transport of particles and heat is found to be mainly driven by a field-aligned coherent mode with poloidal number $m=4$. The analysis of this mode, based on non-local linear theory considerations, shows its ballooning nature. In contrast to tokamak simulations and experiments, where blobs often contribute to transport, we do not observe the presence of intermittent transport events.
