Stochastic and a posteriori optimization to mitigate coil manufacturing errors in stellarator design
Stochastic and a posteriori optimization to mitigate coil manufacturing errors in stellarator design
复制标题
随机和后验优化可减少仿星器设计中的线圈制造误差
DOI:
10.1088/1361-6587/ac89ee
复制
发表时间:
2022
影响因子:
2.2
通讯作者:
Stadler, Georg
中科院分区:
文献类型:
--
作者:
Wechsung, Florian;Giuliani, Andrew;Landreman, Matt;Cerfon, Antoine;Stadler, Georg
It was recently shown in Wechsung et al (2022 Proc. Natl Acad. Sci. USA 119 e2202084119) that there exist electromagnetic coils that generate magnetic fields, which are excellent approximations to quasi-symmetric fields and have very good particle confinement properties. Using a Gaussian process-based model for coil perturbations, we investigate the impact of manufacturing errors on the performance of these coils. We show that even fairly small errors result in noticeable performance degradation. While stochastic optimization yields minor improvements, it is not possible to mitigate these errors significantly. As an alternative to stochastic optimization, we then formulate a new optimization problem for computing optimal adjustments of the coil positions and currents without changing the shapes of the coil. These a-posteriori adjustments are able to reduce the impact of coil errors by an order of magnitude, providing a new perspective for dealing with manufacturing tolerances in stellarator design.
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