arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.00196physics.plasm-phphysics.comp-ph
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使用自动微分的优化有限构造仿星器线圈

Optimized finite-build stellarator coils using automatic differentiation

Nick McGreivy, Stuart R. Hudson, Caoxiang Zhu

摘要:

介绍了一种新的仿星器线圈设计规范,该规范优化了有限构建线圈的位置和绕组包方向。新的代码称为FOCRAND ADD,在高维非凸空间中执行基于梯度的优化。使用自动微分,可以容易且有效地计算关于有限构建线圈的参数的导数。FOSTRUCTURE ADD使用傅立叶级数参数化自由空间中的线圈位置,并使用多丝近似线圈绕组包。绕组包的方向用傅立叶级数参数化,并且也可以被优化。优化的有限构建线圈的W7-X类仿星器,并与间接线圈的结果进行了比较。优化的有限构建W7-X样线圈的最终位置相对于优化的辅助线圈平均偏移约2.5mm。这些结果表明,有限构建效应应占在优化的仿星器与低线圈公差。

英文摘要:

A new stellarator coil design code is introduced that optimizes the position and winding pack orientation of finite-build coils. The new code, called FOCUSADD, performs gradient-based optimization in a high-dimensional, non-convex space. The derivatives with respect to parameters of finite-build coils are easily and efficiently computed using automatic differentiation. FOCUSADD parametrizes coil positions in free space using a Fourier series and uses a multi-filament approximation to the coil winding pack. The orientation of the winding pack is parametrized with a Fourier series and can be optimized as well. Optimized finite-build coils for a W7-X-like stellarator are found, and compared with filamentary coil results. The final positions of optimized finite-build W7-X-like coils are shifted, on average, by approximately 2.5mm relative to optimized filamentary coils. These results suggest that finite-build effects should be accounted for in the optimization of stellarators with low coil tolerances.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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