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Intermittence and turbulence in fusion devices

B A Carreras, L García, J H Nicolau, B Ph van Milligen, U Hoefel, M Hirsch, the TJ-II and W7-X Teams2020年Plasma Physics and Controlled FusionIF 2.2出版社

In this work, we explore the response of the intermittence parameter C(1) to the magnetic topology of confined fusion plasmas, as well as to spontaneously generated zonal flows. To achieve this, we make extensive use of resistive Magneto-Hydrodynamic calculations. First, we explore single helicity calculations, where we observed clearly that the intermittence is due to the mixing between turbulence and (poloidal) flow fluctuations. The minima of C(1) were correlated with maxima of the mean transfer entropy, , noting that the latter have been identified with 'trapping zones' for radial transport in previous work. Thus, these 'trapping zones' are closer to monofractality than the surrounding plasma. In more realistic multiple helicity calculations, these results were confirmed, although somewhat less clear, as the mutual interaction between helicities now also contributed to the intermittence. We applied these techniques to experimental Electron Cyclotron Emission data from the W7-X stellarator and found that these observations also appear to hold in an experimental situation. Thus, we conclude that the intermittence parameter C(1) may provide valuable indirect information about the interaction between fluctuations, zonal flows, and the magnetic topology of fusion plasmas.

日本語訳

本稿では、閉じ込め核融合プラズマの磁気トポロジーに対する間欠性パラメータC(1)の応答と、自発的に生成される帯状流に対する応答を探求する。これを達成するために、抵抗性磁気流体力学計算を広範に用いる。まず、単一ヘリシティ計算を探求し、そこで間欠性が乱流と(ポロイダル)流動の変動との間の混合に起因することを明確に観察した。C(1)の最小値は、平均伝達エントロピーの最大値と相関しており、後者は以前の研究で動径輸送の「捕捉領域」と同定されていることに留意する。したがって、これらの「捕捉領域」は、周囲のプラズマよりも単フラクタル性に近い。より現実的な多重ヘリシティ計算では、これらの結果は確認されたが、やや明確さは低下した。これは、ヘリシティ間の相互相互作用が今や間欠性にも寄与するためである。我々はこれらの手法をW7-Xステラレータからの実験的電子サイクロトロン放射データに適用し、これらの観察が実験状況でも成り立つように見えることを見出した。したがって、間欠性パラメータC(1)は、変動、帯状流、および核融合プラズマの磁気トポロジー間の相互作用に関する貴重な間接的情報を提供し得ると結論付ける。

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