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2020•Nuclear FusionOpen access

Measurements of the parameter dependencies of the bootstrap current in the W7-X stellarator

Ulrich Neuner, K. Rahbarnia, C. D. Beidler, A. Dinklage, Yuriy Turkin, T. Stange, Tamara L Andreeva, Jonathan L. Schilling, Henning Thomsen, M. Beurskens, S. Bozhenkov, K. J. Brunner, Hannes Damm, G. Fuchert, J. Geiger, U. Hergenhahn, U. Höfel, Jens P Knauer, M. Krychowiak, Sehyun Kwak, Andreas Langenberg, N. Pablant, Ekkehard Pasch, A. Pavone, Evan R. Scott, J. Svensson, Humberto Trimiño Mora, the Wendelstein -X team

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Abstract

Abstract 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 × 1020 m−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.

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Abstract 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 × 1020 m−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.

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Available abstract

Abstract 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 × 1020 m−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.

Key concepts: Stellarator, Bootstrap current, Plasma, Physics, Wendelstein 7-X, Toroid, Sign (mathematics), Diffusion

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