Finding coil sets with desirable physics and engineering properties is a crucial step in the design of modern stellarator devices. Existing stellarator coil optimization codes ultimately produce zero-thickness filament coils. However, stellarator coils have finite depth and thickness, which can make the single-filament model a poor approximation, particularly when coil build dimensions are relatively large compared to the coil–plasma distance. In this paper, we present a new method for designing coils with finite builds and present a mechanism to optimize the orientation of the winding pack. We approximate finite-build coils with a multi-filament model. A numerical implementation has been developed, and applications to the Helically Symmetric eXperiment stellarator and a new UW-Madison quasihelically symmetric configuration are shown.

中文翻译：

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有限构建仿星器线圈的优化

寻找具有理想物理和工程特性的线圈组是现代仿星器设备设计的关键步骤。现有的仿星器线圈优化代码最终会产生零厚度的灯丝线圈。然而，仿星器线圈具有有限的深度和厚度，这会使单丝模型的近似性较差，特别是当线圈构建尺寸与线圈-等离子体距离相比相对较大时。在本文中，我们提出了一种设计有限构造线圈的新方法，并提出了一种优化绕组包方向的机制。我们用多丝模型近似有限构建线圈。已经开发了数值实现，并显示了螺旋对称实验仿星器和新的 UW-Madison 准螺旋对称配置的应用。