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Measurements of bicoherence and long-range correlations during biasing in the HSX stellarator

R.S. Wilcox, B.Ph. van Milligen, C. Hidalgo, D.T. Anderson, J.N. Talmadge, F.S.B Anderson, M. Ramisch2011年被引用 12Nuclear FusionIF 3出版社

The effect of biasing on edge fluctuations has been studied in the HSX stellarator using Langmuir probes. Biasing leads to an increase in the bicoherence of the poloidal electric field, as well as a simultaneous increase in long-range correlations of the floating potential, measured using toroidally separated Langmuir probes. These observations are consistent with zonal flow formation. A comparison has been made between experiments in an optimized quasi-symmetric magnetic configuration (quasi-helically symmetric—QHS) and a configuration with the symmetry intentionally degraded (mirror). The observed differences are insignificant and most likely unrelated to the change in configuration.

日本語訳

HSXステラレーターにおいて、ランクミュアプローブを用いてバイアスが端部揺動に及ぼす影響を研究した。バイアスは、ポロイダル電場のバイコヒーレンスの増加と、トロイダル方向に分離されたランクミュアプローブで測定された浮遊電位の長距離相関の同時増加をもたらす。これらの観測結果は、帯状流の形成と一致している。準対称磁場配位(準ヘリカル対称—QHS)と、対称性を意図的に劣化させた配位(ミラー)との間で実験の比較が行われた。観測された差異はわずかであり、配位の変更に起因するものではない可能性が高い。

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