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Optimum-confinement in the wendelstein 7-AS stellarator

A Weller, R Brakel, R Burhenn, V Erckmann, P Grigull, H -J Hartfuss, H Maassberg, H Renner, H Ringler, F Sardei1991年Plasma Physics and Controlled FusionIF 2.2出版社

Optimum confinement is realized in Wendelstein 7-AS by wall conditioning and by properly adjusting the parameters determining the magnetic field configuration. The effective heating of net current free plasmas by ECRF and neutral beam injection (NBI) involves different plasma parameters and transport regimes. Stationary plasmas are generally produced by ECRF, whereas density and impurity control is a severe problem during NBI. This has initiated different kinds of impurity and particle control scenarios. An extended parameter range with electron temperatures of 200 eV<or=Te<or=3 keV, ion temperatures of 100 eV<or=Ti <or= 0.7 keV and electron densities of 1019 <or= ne<or=3.1020 m-3 was accessible. The characteristics of the energy confinement and the particle and impurity transport are described and related to the specific heat and particle sources. The investigations comprise the analysis of electron and ion heat conductivity, particle transport modelling and impurity transport studies by laser blow-off-experiments. The influence of the ambipolar electric field is discussed.

日本語訳

最適な閉じ込めは、Wendelstein 7-ASにおいて、壁調整と磁場配位を決定するパラメータの適切な調整によって実現された。ECRFおよび中性粒子ビーム入射(NBI)による正味電流ゼロプラズマの効果的な加熱には、異なるプラズマパラメータと輸送領域が関与する。定常プラズマは一般にECRFによって生成されるが、NBI中は密度と不純物の制御が深刻な問題となる。これにより、さまざまな種類の不純物および粒子制御シナリオが開始された。電子温度200 eV≦Te≦3 keV、イオン温度100 eV≦Ti≦0.7 keV、電子密度10¹⁹≦ne≦3×10²⁰ m⁻³の広範なパラメータ範囲が利用可能であった。エネルギー閉じ込めの特性と粒子および不純物輸送について説明し、特定の熱源および粒子源と関連付ける。調査には、電子およびイオンの熱伝導率の解析、粒子輸送モデリング、レーザーブローオフ実験による不純物輸送の研究が含まれる。さらに、動径電場の影響についても議論する。

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