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Optimized confinement discharges in the stellarator W7-AS

J Baldzuhn, L Giannone, M Kick, K McCormick, W7-AS Team2000年Plasma Physics and Controlled FusionIF 2.2出版社

In addition to the well known H-mode, other types of discharges with enhanced core energy confinement can be observed in the stellarator W7-AS. In this contribution, the properties of some particular examples of those optimized confinement (OC) discharges are presented. These are characterized, besides improved core energy confinement, by strong negative radial electric fields and high ion temperatures in the gradient region, steep density profile gradients and a high penetration depth of neutrals, and small edge electron densities. The role of these plasma parameters for the OC discharges is investigated quantitatively by a numerical model.

日本語訳

よく知られたHモードに加えて、W7-ASステラレータでは、コア部のエネルギー閉じ込めが向上した他のタイプの放電も観測することができる。本稿では、そのような最適化閉じ込め(OC)放電のいくつかの具体例の特性について述べる。これらの放電は、コア部のエネルギー閉じ込めの改善に加えて、強い負の径方向電場と勾配領域における高いイオン温度、急峻な密度勾配と高い中性粒子の浸透深さ、そして小さな周辺電子密度によって特徴づけられる。これらのOC放電に対するプラズマパラメータの役割を、数値モデルを用いて定量的に調べる。

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StellaratorW7-AS
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