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The isotope effects in RFP magnetic configuration

R Lorenzini, M Gobbin, RFX-mod team2021年Plasma Physics and Controlled FusionIF 2.2出版社

The comparison between deuterium and hydrogen plasmas at high current in the RFX-mod experiment proves that the reversed field pinch configuration experiences the isotope effect in a way analogous to tokamak experiments. Both energy and particle confinement exhibit a favourable scaling with the isotope mass Mi, respectively, as and as . This effect is mainly due to the mitigation of transport at the edge, which is driven by electrostatic fluctuations, although a mitigation of the stochastic transport in the plasma core is also observed. As in tokamaks, the MHD properties are modified when the gas mass is changed. The most evident modification regards the spectrum of tearing modes that are more stable in deuterium, so that the duration and the purity of quasi single helicity (QSH) phases are enhanced. The thermal structures that develop during the QSH phases enclose a plasma volume that is wider in deuterium discharges than in hydrogen ones.

日本語訳

重水素プラズマと水素プラズマの高電流におけるRFX-mod実験での比較は、逆転磁場ピンチ配位がトカマク実験と同様の方法で同位体効果を示すことを証明している。エネルギー閉じ込めと粒子閉じ込めはともに、それぞれ および として同位体質量Miに対して有利なスケーリングを示す。この効果は主に、静電揺動によって駆動される端部での輸送の緩和によるものであり、プラズマコアにおける確率輸送の緩和も観測されるが、その影響はより小さい。トカマクと同様に、ガス質量が変化するとMHD特性も変化する。最も顕著な変化はテアリングモードのスペクトルに関連しており、重水素ではより安定であるため、準単一ヘリシティ(QSH)位相の持続時間と純度が向上する。QSH位相中に発達する熱構造は、水素放電と比較して重水素放電ではより広いプラズマ体積を囲む。

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