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Modelling of lower hybrid current drive in the presence of spatial radial diffusion

I.P. Shkarofsky, M.M. Shoucri1997年被引用 9Nuclear FusionIF 3出版社

A code to solve the full three dimensional Fokker-Planck kinetic equation in the presence of lower hybrid current drive (LHCD) is applied to study numerically the problem of modelling LHCD, including the combined effects of spatial radial diffusion and an electric field. The code uses the Beliaev-Budker relativistic collision operator, and applies a method of fractional steps to the numerical solution of the time evolution equation for the three dimensional Fokker-Planck equation. The importance of the numerical approach associated with an exact relativistic treatment for the solution is emphasized in order to study accurately all the physics associated with this problem, especially the shape of the distribution function and the physics associated with its hot tail as, for instance, the fast electron transport and lower hybrid absorbed power profiles. The aim of the simulation is to match hard X ray imaging profiles and current density profiles. An accurate relativistic treatment of the hot tail helps make the study of these problems less phenomenological and more physical. Some preliminary results from the Tokamak de Varennes (TdeV) are analysed in order to illustrate the power of the method

日本語訳

下混合波電流駆動(LHCD)を伴う完全な三次元フォッカー・プランク運動方程式を解くためのコードが、空間的径方向拡散と電場の複合効果を含むLHCDのモデル化を数値的に研究するために適用される。このコードは、ベラエフ・ブドカー相対論的衝突演算子を用い、三次元フォッカー・プランク方程式の時間発展方程式の数値解に対して分数ステップ法を適用する。この問題に伴うすべての物理、特に分布関数の形状とその高温尾部に関連する物理、例えば高速電子輸送や下混合波吸収パワープロファイルを正確に研究するために、正確な相対論的取り扱いを伴う数値的アプローチの重要性が強調される。シミュレーションの目的は、硬X線イメージングプロファイルと電流密度プロファイルを一致させることである。高温尾部の正確な相対論的取り扱いは、これらの問題の研究を現象論的ではなくより物理的なものにするのに役立つ。バレンヌ・トカマク(TdeV)からの予備的な結果が、この手法の有効性を例示するために解析される。

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Current driveLower hybridLower hybrid current drive
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