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Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator
Nuclear Fusion ( IF 3.3 ) Pub Date : 2021-02-19 , DOI: 10.1088/1741-4326/abd61a
U. Neuner 1 , K. Rahbarnia 1 , C.D. Beidler 1 , A. Dinklage 1 , Y. Turkin 1 , T. Stange 1 , T. Andreeva 1 , J. Schilling 1 , H. Thomsen 1 , M. Beurskens 1 , S. Bozhenkov 1 , K.J. Brunner 1 , H. Damm 1 , G. Fuchert 1 , J. Geiger 1 , U. Hergenhahn 1 , U. Hfel 1 , J. Knauer 1 , M. Krychowiak 1 , S. Kwak 1 , A. Langenberg 1 , N. Pablant 2 , E. Pasch 1 , A. Pavone 1 , E.R. Scott 1, 3 , J. Svensson 1 , H.Trimino Mora 1
Affiliation  

Intrinsic, diffusion-driven toroidal (bootstrap) currents between −7 and 17 kA were measured in the optimised stellarator Wendelstein 7-X (W7-X) for several magnetic configurations at line-integrated plasma densities between 2 1019 and 1.6 1020m−2 and heating powers between 0.5 and 6 MW. The sign of the bootstrap current changes with field reversal, and its magnitude decreases with the mirror term and the rotational transform of the magnetic configuration as well as the line-integrated plasma density, and increases with the heating power. Both the absolute values and the dependencies agree with neoclassical calculations within their respective uncertainties, confirming the neoclassical optimisation of W7-X for small bootstrap currents.



中文翻译:

W7-X仿星器中自举电流参数相关性的测量

在优化的仿星器 Wendelstein 7-X (W7-X) 中,在 2 10 19和 1.6 10 20 m之间的线积分等离子体密度下,针对几种磁性配置测量了介于 -7 kA 和 17 kA 之间的固有的、扩散驱动的环形(自举)电流−2和 0.5 到 6 MW 之间的加热功率。自举电流的符号随场反转而变化,其幅值随镜项和磁构型的旋转变换以及线积分等离子体密度而减小,随加热功率的增大而增大。绝对值和相关性都在其各自的不确定性内与新古典计算一致,证实了 W7-X 对小自举电流的新古典优化。

更新日期:2021-02-19
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