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Study of non-linear coupling of fluctuations at long distance in LHD

S. Inagaki, T. Tokuzawa, T. Kobayashi, S.-I. Itoh, K. Itoh, K. Ida, A. Fujisawa, S. Kubo, T. Shimozuma, N. Tamura2014年被引用 11Nuclear FusionIF 3出版社

Non-linear coupling between fluctuations at different radial locations is observed on the Large Helical Device (LHD) plasma. The summed bi-coherence between the low frequency macro-scale fluctuation (frequency is f = 2.75 kHz) at ρ = reff/a99 = 0.63 (where a99 is averaged plasma radius) and the high-frequency micro-scale fluctuations (frequency range of f > 150 kHz) at ρ = 0.88 is found to converge to a non-zero and finite value. The bi-phase analysis provides another basis for the non-linear interaction across the long distance. These results are associated with the violation local closure for transport relation.

日本語訳

大型ヘリカル装置(LHD)プラズマにおいて、異なる径方向位置における揺動間の非線形結合が観測される。ρ = reff/a99 = 0.63(ここでa99は平均プラズマ半径)における低周波マクロスケール揺動(周波数f = 2.75 kHz)と、ρ = 0.88における高周波マイクロスケール揺動(周波数範囲f > 150 kHz)との間の総和バイコヒーレンスは、非零かつ有限の値に収束することが見出された。バイフェーズ解析は、長距離にわたる非線形相互作用に対するもう一つの根拠を提供する。これらの結果は、輸送関係における局所性の破れと関連している。

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