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Fast recovery of the magnetic vacuum configurations of the WEGA stellarator with error field effects

机译：快速恢复WEGA恒星仪的电磁真空配置并具有误差场效应

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摘要

With a background of having obtained positive results with function parametrization (FP) applied to stellarator configurations, the technique was used once again for recovering the vacuum magnetic field configurations of the WEGA stellarator including the main symmetry-breaking magnetic islands. A classical stellarator of type l = 2, WEGA has an inherent n = 1 (leading order) field perturbation responsible for these islands. The perturbation is assumed to be generated by a misalignment between the centres of the toroidal and helical field generating coil systems. These n = 1-periodic WEGA configurations, displaying no stellarator symmetry, were numerically generated around the experimental boundaries and analysed with FP. For the first time FP models with 4th order polynomials and non-linear regressions with rational functions were needed to parametrize the physical state of the configurations. Modelling of the widths of the magnetic islands was challenging, however. The FP-functions are in the process of being implemented to run with the WEGA control system.
机译：在将功能参数化（FP）应用于恒星器配置并获得积极成果的背景下，该技术再次用于恢复WEGA恒星器的真空磁场配置，其中包括破坏对称性的主要磁岛。类型为l = 2的经典恒星，WEGA固有的n = 1（超前阶）场扰动负责这些岛。假定扰动是由环形磁场产生线圈系统和螺旋磁场产生线圈系统的中心之间的未对准产生的。这些n = 1周期的WEGA配置（不显示任何恒星对称性）是在实验边界附近生成的，并用FP进行了分析。首次需要使用具有四阶多项式和具有有理函数的非线性回归的FP模型来参数化配置的物理状态。然而，对磁性岛的宽度进行建模具有挑战性。 FP功能正在实现中，以与WEGA控制系统一起运行。

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