先进仿星器的准单阶段优化
Quasi-single-stage optimization for advanced stellarators
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中文总结 AI 辅助
本文提出准单阶段（QSS）框架，将线圈可行性纳入等离子体边界优化，优化出的仿星器构型性能良好且线圈复杂度降低，为仿星器设计的协同优化提供了实用策略。
中文摘要 AI 辅助
先进仿星器设计需要在等离子体性能与三维模块化线圈的可制造性之间取得平衡。在传统的两阶段优化中，实现优化平衡所需的线圈可能受限于工程可行性。本文开发了准单阶段（QSS）框架，该框架将线圈可行性直接纳入等离子体边界优化。QSS采用最大归一化法向场误差作为线圈可行性的替代指标，该误差通过均匀偏移绕组表面上的表面电流快速计算得到。我们将此方法应用于优化目标为准轴对称、准螺旋对称、准等动力学性，以及全向性与分段全向性组合的构型。经QSS优化的构型呈现更平滑的等离子体边界和绕组表面，法向场重建误差更低，线圈复杂度降低，同时保留了良好的磁对称和输运特性。QSS为仿星器设计中协同优化等离子体物理与线圈工程提供了实用的原理验证策略。
英文摘要
Advanced stellarator design requires a balance between plasma performance and the manufacturability of three-dimensional modular coils. In conventional two-stage optimization, the coils required to realize an optimized equilibrium can be limited by engineering feasibility. Here, we develop a quasi-single-stage (QSS) framework that incorporates coil feasibility directly into plasma-boundary optimization. QSS uses the maximum normalized normal-field error, evaluated rapidly from surface currents on a uniformly offset winding surface, as a coil-feasibility surrogate. We apply this method to optimize configurations targeting quasi-axisymmetry, quasi-helical symmetry, quasi-isodynamicity, and a combination of omnigenity with piecewise omnigenity. The QSS-optimized configurations exhibit smoother plasma boundaries and winding surfaces, lower normal-field reconstruction errors, and reduced coil complexity, while preserving favourable magnetic-symmetry and transport properties. QSS provides a practical proof-of-principle strategy for co-optimizing plasma physics and coil engineering in stellarator design.
