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Tearing mode physics studies applying the dynamic ergodic divertor on TEXTOR

H R Koslowski, E Westerhof, M de Bock, I Classen, R Jaspers, Y Kikuchi, A Krämer-Flecken, A Lazaros, Y Liang, K Löwenbrück2006年Plasma Physics and Controlled FusionIF 2.2出版社

The dynamic ergodic divertor (DED) on the TEXTOR tokamak allows for the reproducible destabilization of the m/n = 2/1 tearing mode which is phase locked to the external static or rotating perturbation field. In combination with its flexible heating systems (co- and counter-neutral beam injection, ion cyclotron resonance heating, electron cyclotron resonance heating (ECRH) with steerable launcher) dedicated experiments to study the mode onset, properties of large islands and mode stabilization can be performed. The dependence of the mode excitation threshold (field penetration) on the plasma rotation shows a resonance character, with minimum threshold when the external perturbation frequency matches the MHD frequency of the 2/1 mode. Mode stabilization by ECRH heating shows that for the TEXTOR plasma heating is more effective than the current drive in O-point. Extrapolation to ITER yields a significant contribution to the mode suppression originating from the temperature increase within the island. Alfvén-like modes, which have been previously identified in the vicinity of large islands on FTU (Buratti et al2005 Nuclear Fusion45 1446), are found to be created already before island formation above a certain threshold of the externally applied perturbation field.

日本語訳

TEXTORトカマクにおける動的エルゴディックダイバータ(DED)は、外部静磁場または回転摂動場に位相ロックされたm/n = 2/1テアリングモードの再現可能な不安定化を可能にする。その柔軟な加熱システム(同方向・逆方向中性粒子ビーム入射、イオンサイクロトロン共鳴加熱、ステアリング可能なランチャーを備えた電子サイクロトロン共鳴加熱(ECRH))と組み合わせることで、モードの発生、大規模アイランドの特性、およびモードの安定化を研究するための専用実験を行うことができる。モード励起閾値(磁場侵入)のプラズマ回転への依存性は共鳴特性を示し、外部摂動周波数が2/1モードのMHD周波数と一致するときに閾値は最小となる。ECRHによるモード安定化は、TEXTORプラズマにおいてO点での電流駆動よりも加熱の方がより効果的であることを示している。ITERへの外挿により、アイランド内の温度上昇に起因するモード抑制への有意な寄与が得られる。FTUの大型アイランド近傍で以前に同定されたアルヴェン様モード(Buratti et al. Nuclear Fusion 45, 1446 (2005))は、外部印加摂動場の特定の閾値を超えた場合、アイランド形成前にすでに生成されることが見出されている。

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textor高精度(タイトル一致)iter中精度(概要文一致)

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DivertorTearing modeTEXTORErgodic divertor
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