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Effect of rotating helical magnetic field on the turbulence fractal structure and transport in the tokamak edge plasma

V. Budaev, Y. Kikuchi, Y. Uesugi, S. Takamura2004年被引用 29Nuclear FusionIF 3出版社

Fractal structure of the edge turbulence and enhanced turbulent transport have been studied in the tokamak HYBTOK-II with a variation of the rotating helical magnetic field (RHF) frequency in the range 5–30 kHz. Edge fluctuations have non-Gaussian statistics caused by intermittent bursts with a time scale of 40–100 µs. The variation in the RHF frequency has a selective effect on the fractal structure of edge turbulence and the turbulent flux, demonstrating a selective control of the transport process. A delayed synchronization control of resonant drift wave modes by the RHF is considered as a candidate mechanism to explain the dependence of the effect on the RHF frequency.

日本語訳

トカマクHYBOT-IIにおいて、回転螺旋磁場(RHF)の周波数を5〜30 kHzの範囲で変化させた場合の、エッジ乱流のフラクタル構造と増強された乱流輸送について研究した。エッジ乱流は、40〜100 µsの時間スケールを持つ間欠的なバーストによって引き起こされる非ガウス統計を示す。RHF周波数の変化は、エッジ乱流のフラクタル構造と乱流輸送に選択的な影響を及ぼし、輸送過程の選択的制御を示している。RHFによるドリフト波の遅延同期制御は、RHF周波数に対する効果の依存性を説明する候補メカニズムとして考えられている。

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