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A tutorial on some basic aspects of divertor physics

P C Stangeby2000年Plasma Physics and Controlled FusionIF 2.2出版社

Some of the basic aspects of the scrape-off layer, SOL, of magneticallyconfined plasmas are reviewed. SOLs defined by limiters and divertors arecompared. The role of parallel heat convection versus conduction is considered andthe relation to the desired condition of large ∇∥T along the SOL is assessed.A very simple SOL model is developed to calculate the two-dimensional `fields' in the SOL,i.e. T(s∥,s⊥),n(s∥,s⊥), using measured boundary conditions from Langmuirprobes built into divertor targets or limiters. The model is applied to aDIII-D discharge and comparisons are made between the model and measurementsmade by Thomson scattering and photodiodes. Values of D⊥SOLand χ⊥SOL are extracted fromthe experimental data using the simple model.

日本語訳

磁気閉じ込めプラズマのスクレイプオフ層(SOL)の基本的な側面のいくつかを概説する。リミターおよびダイバータによって定義されるSOLを比較する。平行方向の熱対流と伝導の役割を考察し、SOLに沿った大きな∇∥Tという望ましい条件との関連を評価する。非常に単純なSOLモデルを開発し、ダイバータターゲットまたはリミターに組み込まれたラングミュアプローブからの測定境界条件を用いて、SOL内の二次元「場」、すなわちT(s∥,s⊥)、n(s∥,s⊥)を計算する。このモデルをDIII-D放電に適用し、モデルとトムソン散乱およびフォトダイオードによる測定結果との比較を行う。単純なモデルを用いて実験データからD⊥SOLおよびχ⊥SOLの値を抽出する。

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