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On diffusion of magnetic field lines

D F Duchs, A Montvai, C Sack1991年Plasma Physics and Controlled FusionIF 2.2出版社

Overlapping resonant perturbations of Tokamak equilibrium magnetic fields can produce volumes with 'stochastic' field lines. The common assumption of a diffusive field line spreading in such volumes has not been found to be generally valid. Because numerical errors can feign stochasticity, a new mapping technique has been applied. Examples of overlapping perturbations have been evaluated by statistical means. Very long correlations contradict simple diffusion models. Increasing the perturbation amplitudes to large values does not necessarily enhance stochasticity, but new ordered structures in phase space can appear.

日本語訳

トカマク平衡磁場の重なり合う共鳴摂動は、確率的な磁力線を持つ体積を生成し得る。そのような体積における磁力線の拡散的な広がりという一般的な仮定は、一般的には有効ではないことが判明している。数値的な誤差が確率性を模擬し得るため、新しいマッピング手法が適用された。重なり合う摂動の例は、統計的手法によって評価された。非常に長い相関は、単純な拡散と矛盾する。摂動振幅を大きな値に増加させることは、必ずしも確率性を強化するわけではなく、位相空間において新しい秩序構造が現れ得る。

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