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A study of turbulent filaments in the edge plasma of the Wendelstein 7-X stellarator

A. Buzás, G. Kocsis, C. Biedermann, G. Cseh, T. Szepesi, M. Szűcs, the W7-X Team2024年6月Nuclear FusionIF 3出版社

Filaments are studied by examining fast camera images on the Wendelstein 7-X stellarator. Fast cameras offer a unique perspective, revealing the complex 3D structure of filaments in the entire poloidal cross-section of the plasma. By correlating individual pixels, their location, shape, and movement are analyzed in standard and high-ι configurations. The presence of filaments is not uniform poloidally around. The number of active areas matches the number of magnetic islands in both configurations. Filaments are found to extend to multiple toroidal turns in standard configuration. No time delay is observed between the different toroidal sections. Such behavior is not seen in high-ι configuration. Filaments are observed within and without the edge shear layer, indicated by the direction of their poloidal rotation. Inside the shear layer, their velocity scatters around 1.25 km s−1, accompanied by a lifetime between 80 and 120 µs. Outside, their velocity shows greater absolute values and variance, but still in a few km s−1 range. The similarities and differences between the two configurations are discussed and compared to previous results.

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wendelstein-7x高精度(タイトル一致)

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StellaratorWendelsteinEdge plasma

AIによる論文要約

ウェンデルシュタイン7-Xステラレータの端部プラズマにおける乱流フィラメントの研究
JAこの論文は、核融合プラズマ物理の研究者や学生に興味深いと思います。プラズマ端部の乱流構造を理解することは、プラズマ閉じ込めの改善につながるからです。#プラズマ物理 #ステラレータ #乱流フィラメント #高速カメラ

この論文では、ウェンデルシュタイン7-Xステラレータのプラズマ端部におけるフィラメントの3次元構造を高速カメラで観察しています。標準構成とハイ・イオタ構成の2つの配位で、フィラメントの位置、形状、運動を分析しています。フィラメントはポロイダル断面内で均一ではなく、磁気島の数に一致しています。標準配位では複数ターンにわたって伸びていますが、ハイ・イオタ配位では見られません。

ENThis paper is of interest to fusion researchers and plasma physicists studying the edge plasma behavior in stellarators and other fusion devices. It provides valuable information on the complex 3D structure and dynamics of turbulent filaments, which are important for understanding plasma confinement and transport.#FusionPlasma #StellaratorEdgePlasma #TurbulentFilaments #PlasmaConfinement

This paper studies turbulent filaments in the edge plasma of the Wendelstein 7-X stellarator, a fusion device. It uses fast cameras to analyze the complex 3D structure, location, and movement of these filaments, and compares their behavior in different magnetic configurations. The results provide insights into the role of magnetic islands and shear layers in the formation and dynamics of these filaments.

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