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The dynamic ergodic divertor in the TEXTOR tokamak: plasma response to dynamic helical magnetic field perturbations

K H Finken, S S Abdullaev, W Biel, M F M de Bock, C Busch, E Farshi, M von Hellermann, G M D Hogeweij, M Jakubowski, R Jaspers2004年Plasma Physics and Controlled FusionIF 2.2出版社

Recently, the dynamic ergodic divertor (DED) of TEXTOR has been studied in an m/n = 3/1 set-up which is characterized by a relatively deep penetration of the perturbation field. The perturbation field creates (a) a helical divertor, (b) an ergodic pattern and/or (c) excitation of tearing modes, depending on whether the DED current is static, rotating in the co-current direction or in the counter-current direction. Characteristic divertor properties such as the high recycling regime or enhanced shielding have been studied. A strong effect of the ergodization is spin up of the plasma rotation, possibly due to the electric field at the plasma edge. Tearing modes are excited in a rather reproducible way and their excitation threshold value, their motion and their reduction due to the ECRH/ECCD have been studied. The different scenarios are characterized by strong modifications of the toroidal velocity profile and by a reduced or enhanced radial transport.

日本語訳

最近、TEXTORの動的エルゴード・ダイバータ(DED)が、m/n = 3/1配列で研究されており、この配列は摂動磁場の比較的深い浸透を特徴としている。摂動磁場は、DED電流が静的であるか、コプラズマ方向に回転しているか、反プラズマ方向に回転しているかに応じて、(a)ヘリカル・ダイバータ、(b)エルゴードパターン、および/または(c)テアリングモードの励起を生成する。高リサイクリング領域や強化された遮蔽などの特徴的なダイバータ特性が研究されている。エルゴード化の顕著な効果は、おそらくプラズマ端部の電場によるプラズマ回転のスピンアップである。テアリングモードはかなり再現性よく励起され、その励起閾値、運動、およびECRH/ECCDによる低減が研究されている。異なるシナリオは、トロイダル速度分布の大きな変化と、径方向輸送の低減または増強によって特徴づけられる。

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textor高精度(タイトル一致)

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DivertorTEXTORErgodic divertor
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