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Impurity transport and neoclassical predictions

G Fussmann, A R Field, A Kallenbach, K Krieger, K -H Steuer, The ASDEX Team1991年Plasma Physics and Controlled FusionIF 2.2出版社

The authors present a brief review of collisional (classical and neoclassical) and anomalous transport. Particular emphasis is devoted to the question of charge independence of the anomalous transport coefficients and the combined action of anomalous and collisional transport. In the light of these results the experimental facts are analysed and interpreted. It is found that impurity accumulation-characterized by peaked zeff-profiles-is caused by the combined effects of improved confinement (i.e. reduction of anomalous transport) and peaking of the electron density profile. For the cases of pellet refuelled plasmas and counter neutral injection heating quantitative comparisons are performed which show good agreement between the experimental measurements and simulations based upon neoclassical theory.

日本語訳

著者らは、衝突(古典的および新古典的)輸送と異常輸送に関する簡潔なレビューを提示する。特に、異常輸送係数の電荷独立性と、異常輸送と衝突輸送の複合作用の問題に焦点を当てている。これらの結果に基づき、実験事実の分析と解釈が行われる。不純物の蓄積—尖ったzeffプロファイルによって特徴づけられる—は、閉じ込めの改善(すなわち異常輸送の低減)と電子密度プロファイルの尖り化の複合効果によって引き起こされることが見出された。ペレット入射による燃料補給プラズマおよび対向中性粒子ビーム加熱の場合について、定量的比較が行われ、実験測定と新古典理論に基づくシミュレーションの間に良好な一致が示された。

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