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First modelling of the TEXTOR DED near field divertor

K.H. Finken, T. Eich, A. Kaleck1998年被引用 46Nuclear FusionIF 3出版社

As the first step in the modelling of the plasma-wall interaction of the proposed dynamic ergodic divertor (DED) of TEXTOR-94, the topology of the magnetic field lines of the divertor is analysed. Despite the strong ergodization, the magnetic field lines intersecting the wall in one poloidal turn form continuous sets. These sets are visualized by a two dimensional (2-D) imaging technique; the field lines are traced one poloidal turn clockwise and counter-clockwise from the outer midplane, marking those lines intersecting the wall. An overlay of the marked starting points defines areas with the properties of a scrape-off layer (SOL) and areas with field lines ending on one side in the ergodic layer and one side on the wall. The edge plasma can be described by a 2-D model; the model treats part of the plasma as that of a conventional SOL and another part as that with `half open' field lines connecting the divertor target plate with the ergodic layer. Calculations of the power flux distribution in the DED near field divertor are presented.

日本語訳

TEXTOR-94の提案された動的エルゴードダイバータ(DED)のプラズマ-壁相互作用のモデリングの第一歩として、ダイバータの磁力線トポロジーを解析する。強いエルゴード化にもかかわらず、1回のポロイダル回転で壁と交差する磁力線は連続的な集合を形成する。これらの集合は2次元(2-D)可視化手法によって可視化される。磁力線は外側中平面から時計回りおよび反時計回りに追跡され、壁と交差するものをマークする。マークされた開始点の重ね合わせは、スクレイプオフ層(SOL)の特性を持つ領域と、エルゴード層内の片側と壁の片側で終端する「半開放」磁力線の領域を定義する。エッジプラズマは2次元モデルで記述できる。このモデルは、プラズマの一部を従来のSOLとして、別の一部をダイバータターゲット板とエルゴード層を接続する「半開放」磁力線を持つ領域として扱う。DED近傍ダイバータ領域における電力束分布の計算結果を示す。

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