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Simulation of light emission from hydrocarbon injection in TEXTOR using the ERO code

R Ding, A Kirschner, D Borodin, S Brezinsek, A Pospieszczyk, O Schmitz, V Philipps, U Samm, J Chen, J Li2009年Plasma Physics and Controlled FusionIF 2.2出版社

Reaction rate coefficients for higher hydrocarbon molecules (ethane family) have been implemented into the 3D Monte Carlo code ERO, which is used for modelling of hydrocarbon transport and light emission of spectroscopically observable radicals in the edge plasma of fusion experiments. For benchmarking of the ERO modelling, dedicated experiments were carried out at TEXTOR in which different hydrocarbon molecules (CD4, C2D4 and C2D6) were injected into the plasma near the last closed flux surface. The light emission of the hydrocarbon break-up products CD, C2 and C+ was observed. The modelled penetration depths of the light emission from the CD Gerö-band, C2 Swan band and C II are in good agreement with the experiments. The effective inverse photon efficiencies (D/XB values) for CD and C2, which include the dissociation chains of the initial molecules, are more dependent on local electron temperature than on electron density. The calculated D/XB values are in fair agreement with the experimental ones.

日本語訳

高次炭化水素分子(エタン族)の反応速度係数を、核融合実験装置の周辺プラズマにおける炭化水素輸送と分光学的に観測可能なラジカルの発光をモデル化するために使用される3次元モンテカルロコードEROに実装した。EROモデリングのベンチマークのため、TEXTORにおいて、異なる炭化水素分子(CD4、C2D4、C2D6)を最終閉鎖面近傍のプラズマに注入する専用実験を実施した。炭化水素の分解生成物であるCD、C2、Cからの発光を観測した。CDゲルバンド、C2スワンバンド、C Iからの発光の浸透深さのモデル計算値は、実験値と良好な一致を示した。初期分子の解離連鎖を含むCDおよびC2の有効逆光子効率(D/XB値)は、電子密度よりも局所電子温度に強く依存することが明らかになった。計算されたD/XB値は実験値と概ね一致した。

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