论文标题
使用近轴磁场进行恒星湍流模拟
The Use of Near-Axis Magnetic Fields for Stellarator Turbulence Simulations
论文作者
论文摘要
迄今为止，湍流优化的恒星设计的设计依赖于三维平衡代码，例如VMEC，以找到给定的目标函数的最小值。在这项工作中，我们提出了一种基于近轴扩展的免费方法，以计算用于湍流研究中使用的新古典主义优化恒星的几何参数。如下所示，近轴扩展可以是与现有优化恒星设计核心的湍流和稳定性模拟相关的几何参数的合理近似值。特别是，我们检查了出现在陀螺仪方程中，漂移减少的流体方程和理想气球方程中的几何系数。这种方法可以使新恒星优化技术的开发要比传统方法快得多。
The design of turbulence optimized stellarators has so far relied on three-dimensional equilibrium codes such as VMEC in order to find the minimum of a given objective function. In this work, we propose a complimentary approach based on the near-axis expansion to compute the geometry parameters of neoclassicaly optimized stellarators used in turbulence studies. As shown here, the near-axis expansion can be a reasonable approximation of the geometric parameters relevant for turbulence and stability simulations of the core of existing optimized stellarator designs. In particular, we examine the geometry coefficients that appear in the gyrokinetic equation, the drift-reduced fluid equations and the ideal ballooning equation. This approach may allow for the development of new stellarator optimization techniques significantly faster than conventional methods.
