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A review of radiative detachment studies in tokamak advanced magnetic divertor configurations

V A Soukhanovskii2017年Plasma Physics and Controlled FusionIF 2.2出版社

The present vision for a plasma–material interface in the tokamak is an axisymmetric poloidal magnetic X-point divertor. Four tasks are accomplished by the standard poloidal X-point divertor: plasma power exhaust; particle control (D/T and He pumping); reduction of impurity production (source); and impurity screening by the divertor scrape-off layer. A low-temperature, low heat flux divertor operating regime called radiative detachment is viewed as the main option that addresses these tasks for present and future tokamaks. Advanced magnetic divertor configuration has the capability to modify divertor parallel and cross-field transport, radiative and dissipative losses, and detachment front stability. Advanced magnetic divertor configurations are divided into four categories based on their salient qualitative features: (1) multiple standard X-point divertors; (2) divertors with higher order nulls; (3) divertors with multiple X-points; and (4) long poloidal leg divertors (and also with multiple X-points). This paper reviews experiments and modeling in the area of radiative detachment in the advanced magnetic divertor configurations.

日本語訳

トカマクにおけるプラズマ・材料界面の現在の構想は、軸対称ポロイダル磁気X点ダイバータである。標準的なポロイダルX点ダイバータは4つの任務を果たす:プラズマ出力排気、粒子制御(D/T排気)、不純物生成の低減(源)、およびダイバータスクレイプオフ層による不純物遮蔽である。放射デタッチメントと呼ばれる低温・低熱流束のダイバータ運転領域は、現在および将来のトカマクにおいてこれらの任務に対処する主要な選択肢と見なされている。先進磁気ダイバータ配位は、ダイバータの平行輸送および交差輸送、放射・散逸損失、ならびにデタッチメント前面の安定性を変更する能力を有する。先進磁気ダイバータ配位は、その顕著な定性的特徴に基づいて4つのカテゴリーに分類される:(1)複数標準X点ダイバータ、(2)高次零点を有するダイバータ、(3)複数X点を有するダイバータ、および(4)長ポロイダル脚ダイバータ(複数X点を有するものも含む)。本論文は、先進磁気ダイバータ配位における放射デタッチメントの領域に関する実験とモデリングを概説する。

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