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Physics of transport in tokamaks

X Garbet, P Mantica, C Angioni, E Asp, Y Baranov, C Bourdelle, R Budny, F Crisanti, G Cordey, L Garzotti2004年Plasma Physics and Controlled FusionIF 2.2出版社

This paper is an overview of recent results relating to turbulent particle and heat transport, and to the triggering of internal transport barriers (ITBs). The dependence of the turbulent particle pinch velocity on plasma parameters has been clarified and compared with experiment. Magnetic shear and collisionality are found to play a central role. Analysis of heat transport has made progress along two directions: dimensionless scaling laws, which are found to agree with the prediction for electrostatic turbulence, and analysis of modulation experiments, which provide a stringent test of transport models. Finally the formation of ITBs has been addressed by analysing electron transport barriers. It is confirmed that negative magnetic shear, combined with the Shafranov shift, is a robust stabilizing mechanism. However, some well established features of internal barriers are not explained by theory.

日本語訳

本論文は、乱流粒子輸送および熱輸送、ならびに内部輸送障壁(ITB)の形成に関する最近の結果の概要である。乱流粒子ピンチ速度のプラズマパラメータに対する依存性が明らかにされ、実験と比較された。磁気シアと衝突頻度が中心的な役割を果たすことが見出された。熱輸送の解析は、2つの方向で進展した。すなわち、静電乱流の予測と一致することが見出された無次元スケーリング則と、輸送モデルの厳密な検証を提供する変調実験の解析である。最後に、電子輸送障壁の解析を通じてITBの形成が検討された。負の磁気シアとシャフラノフシフトの組み合わせが、堅牢な安定化機構であることが確認された。しかしながら、内部輸送障壁の確立された特徴のいくつかは、理論によって説明されていない。

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