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Features of self-organized plasma physics in tokamaks

K A Razumova2018年Plasma Physics and Controlled FusionIF 2.2出版社

The history of investigations the role of self-organization processes in tokamak plasma confinement is presented. It was experimentally shown that the normalized pressure profile is the same for different tokamaks. Instead of the conventional Fick equation, where the thermal flux is proportional to a pressure gradient, processes in the plasma are well described by the Dyabilanin's energy balance equation, in which the heat flux is proportional to the difference of normalized gradients for self-consistent and real pressure profiles. The transport coefficient depends on the values of heat flux, which compensates distortion of the pressure profile with external impacts. Radiative cooling of the plasma edge decreases the heat flux and improves the confinement.

日本語訳

トカマクプラズマ閉じ込めにおける自己組織化過程の役割に関する研究の歴史を概説する。規格化圧力分布が異なるトカマク間で同一であることが実験的に示された。従来のフィック方程式(熱流束が圧力勾配に比例する)の代わりに、プラズマ中の過程は、自己無撞着な圧力分布と実際の圧力分布の規格化された差に熱流束が比例する、ディアバニロフのエネルギー平衡方程式によってよく記述される。輸送係数は、外部からの影響による圧力分布の歪みを補償する熱流束の値に依存する。プラズマ端部の放射冷却は熱流束を減少させ、閉じ込めを改善する。

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