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Setup and initial results from the magnetic flux surface diagnostics at Wendelstein 7-X

M Otte, D Aßmus, C Biedermann, S Bozhenkov, T Bräuer, A Dudek, J Geiger, G Kocsis, S Lazerson, T S Pedersen2016年Plasma Physics and Controlled FusionIF 2.2出版社

Wendelstein 7-X is an optimized stellarator with superconducting magnetic field coils that just started plasma operation at the Max-Planck-Institut für Plasmaphysik (IPP) Greifswald. Utilizing the electron beam technique the first vacuum flux surface measurements were performed during the commissioning of the magnet system. For the magnetic configurations investigated so far the existence of closed and nested flux surfaces has been validated. All features of the configuration designed for the initial plasma operation phase, including a predicted island chain, were confirmed. No evidence on significant magnetic field errors was found. Furthermore, the effect of the elastic deformation of the non-planar coils was confirmed by the measurements.

日本語訳

Wendelstein 7-Xは、マックス・プランク研究所(IPP)グライフスヴァルトにてプラズマ運転を開始したばかりの、超伝導コイルを備えた最適化ステラレーターである。電子ビーム法を用いて、磁場コイル系の試運転中に最初の真空磁気面測定が実施された。これまでに調査された磁場配位において、閉じた入れ子状の磁気面の存在が検証された。初期プラズマ運転段階用に設計された配位のすべての特徴は、予測されたアイランド鎖を含めて確認された。有意な磁場誤差の証拠は見つからなかった。さらに、非平面コイルの弾性変形の影響が測定により確認された。

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