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The AC response of a tokamak plasma to driven helically resonant radial magnetic perturbations

M.S. Foster, S.C. McCool, A.J. Wootton1995年被引用 15Nuclear FusionIF 3出版社

The edge plasma response to an externally driven oscillating radial magnetic field perturbation is studied in the TEXT tokamak. The perturbation has a dominant m=7, n=2 mode structure and is spatially resonant with rational magnetic surfaces near the plasma edge. Non-overlapping islands with m=5-8 are produced with a driving frequency between 1 and 8 kHz, and the plasma response is measured using numerically designed magnetic sensing coils which match the mode structure of the perturbation. Experimental observations are compared with a theory by Boozer (1984) treating the resulting magnetic islands as resistive-inductive circuit elements. As predicted, the plasma heating response scales as the perturbing current to the 3/2 power, linearly with the perturbation drive frequency, and inversely with the resistivity at the resonant surface. The magnitude of the response is, however, a factor of 2 to 3 larger than that predicted by the Boozer theory, and consistent with island widths ranging from 5 to 80% of the vacuum widths

日本語訳

TEXTトカマクにおいて、外部駆動される振動する径方向磁場摂動に対する周辺プラズマの応答を研究した。この摂動は支配的なm=7、n=2モード構造を持ち、プラズマ周辺部近傍の有理磁気面と空間的に共鳴する。m=5-8の非重なりアイランドが1〜8kHzの駆動周波数で生成され、プラズマ応答は、摂動のモード構造に整合するように数値設計された磁気センシングコイルを用いて測定される。実験的観測は、結果として生じる磁気アイランドを抵抗誘導回路要素として扱うBoozer(1984)の理論と比較される。予測された通り、プラズマ加熱応答は、摂動電流の3/2乗に比例し、摂動駆動周波数に線形に比例し、共鳴面での抵抗率に反比例する。しかしながら、応答の大きさはBoozer理論によって予測されたものより2〜3倍大きく、真空幅の5〜80%の範囲のアイランド幅と一致する。

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