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Experimental evaluation of avalanche type of electron heat transport in magnetic confinement plasmas

F. Kin, K. Itoh, T. Bando, K. Shinohara, N. Oyama, M. Yoshida, K. Kamiya, S. Sumida2023年被引用 3Nuclear FusionIF 3出版社

Turbulent transport is undoubtedly important in magnetic confinement plasmas. It has been reported that a lot of transport dynamics are not satisfying the local diffusive models. Here, we report the quantitative measurement of electron heat flux associated with ballistic propagating long-range transport events, which is considered to be a component of avalanches. In addition, we show the first observations of the substantial impact of avalanche-driven transport on profile resilience (or profile stiffness) observed in JT-60U. We found that, in the channel of the electron heat flux, the ratio between the increment of the avalanche-driven component to that of the total plasma heating becomes dominant (∼80%) in the case of the high-heating limit. This suggests a possible role for avalanche-driven transport to induce profile resilience, which has been evidenced by flux-driven simulations.

日本語訳

乱流輸送は磁場閉じ込めにおいて確かに重要である。多くの輸送ダイナミクスが局所的な拡散モデルを満たさないことが報告されている。ここでは、アバランシェの構成要素と考えられる弾道的に伝播する長距離輸送イベントに伴う電子熱流束の定量的測定を報告する。さらに、JT-60Uで観測された分布の頑健性(または分布の剛性)に対するアバランシェ駆動輸送の顕著な影響の初めての観測結果を示す。電子熱流束のチャネルにおいて、アバランシェ駆動成分の増分と全プラズマ加熱の増分との比が、高加熱極限で支配的(∼80%)になることを見出した。これは、フラックス駆動シミュレーションによって実証された、アバランシェ駆動輸送が分布の頑健性を誘起する可能性を示唆している。

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Heat transportMagnetic confinementElectron heat transport
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