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Reflectometry measurements during operation of the dynamic ergodic divertor at TEXTOR

A. Krämer–Flecken, S. Soldatov, C. Busch, Y. Liang, M. von Hellermann, R. Wolf, O. Zimmermann, the TEXTOR–Team2006年被引用 22Nuclear FusionIF 3出版社

The O-mode correlation reflectometer at TEXTOR is used for the investigation of the propagation and the properties of the turbulence at the plasma edge. The multi-horn antenna set-up allows the investigation of the correlation properties of the turbulence and its rotation. Turbulence and plasma rotation for different plasma conditions are found to be in agreement and based on this comparison the radial electric field is estimated. In addition the density fluctuation level is estimated from the standard deviation of the phase of the reflected signal.The influence of a magnetic perturbation field, generated by the dynamic ergodic divertor (DED), on the turbulence and transport properties is studied and compared with plasmas without such a field perturbation. The strength and radial range of the perturbation field can be widely varied. Together with tangential neutral beam injection in co- and counter-current directions, the turbulent transport is investigated. The combination of neutral beam injection and the DED enables the modification of the plasma rotation profile. It can lead either to the generation of a locked mode or the formation of a transport barrier.

日本語訳

TEXTORにおけるOモード反射計は、プラズマ端部の乱流の伝播と特性の調査に使用される。マルチホーンアンテナ構成により、乱流の相関特性とその回転の調査が可能となる。異なるプラズマ条件における乱流とプラズマ回転は一致していることが見出され、この比較に基づいて径方向電場が推定される。さらに、密度揺動レベルは、反射信号の位相の標準偏差から推定される。動的エルゴディックダイバータ(DED)によって生成された磁場摂動が乱流および輸送特性に及ぼす影響が研究され、そのような磁場摂動のないプラズマと比較される。摂動磁場の強度と径方向範囲は広範囲に変化させることができる。同方向および逆方向の接線方向中性粒子ビーム入射と組み合わせることで、乱流輸送が調査される。中性粒子ビーム入射とDEDの組み合わせにより、プラズマ回転プロファイルの変更が可能となる。これは、ロックモードの生成または輸送障壁の形成のいずれかをもたらす可能性がある。

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DivertorTEXTORReflectometryErgodic divertor
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