Analysis of asymmetric Dα spectra emitted in front of a neutralizer plate of the Tore-Supra ergodic divertor
Analysis of asymmetric Dα spectra emitted in front of a neutralizer plate of the Tore-Supra ergodic divertor
复制标题
分析 Tore-Supra 遍历偏滤器中和板前发出的不对称 Dα 光谱
DOI：
10.1088/0741-3335/44/2/309
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发表时间：
2002
影响因子：
2.2
通讯作者：
M. Mattioli
中科院分区：
文献类型：
--
作者：
M. Koubiti;Y. Marandet;A. Escarguel;H. Capes;L. Godbert;R. Stamm;C. Michelis;R. Guirlet;M. Mattioli
氘D的光谱分析？line（？= 6561.0？？）发射的Tore-Supra边缘的赤道中和板的遍历偏滤器的前面。这种分析，它依赖于一条线的形状建模，重点是不对称的D？在一些转向放电中获得的光谱。它将表明，三个人口的中性？解释这些光谱是必要的。冷原子群是由从表面脱附的分子的解离产生的，而热原子群是由与等离子体离子的电荷交换反应产生的。中性粒子的最后一个种群是由等离子体离子在中和器V形切口\mbox{（V点）}上的正反射产生的，并且具有各向异性的速度分布函数。这种速度分布函数的各向异性是由于其初始形式和中性离子弹性碰撞的部分弛豫。分析的基础上的线形拟合程序，包括一个松弛模型，允许一个估计的相对贡献的中性人口的再循环氘？D？发射及其多普勒温度。最后，离子和中性温度推导出的拟合和占主导地位的分子解离通道的依赖关系进行了讨论，作为边缘电子密度和温度的函数。
A spectroscopic analysis of the deuterium D? line (? = 6561.0??) emitted in the edge of Tore-Supra just in front of the equatorial neutralizer plate of the ergodic divertor is presented. This analysis, which relies on a line shape modelling, is focused on asymmetric D? spectra which are obtained in some diverted discharges. It will be shown that three populations of neutrals are?necessary to interpret such spectra. A cold atoms population results from the dissociation of molecules desorbed from the surface, and a warm one from charge-exchange reactions with the plasma ions. The last population of neutrals is produced by normal reflection of plasma ions on the neutralizer V-shaped notches \mbox{(V-points)} and has an anisotropic velocity distribution function. The anisotropy of this velocity distribution function is due to its initial form and to its partial relaxation by neutral-ion elastic collisions. The analysis based on a line shape fitting program including a relaxation model allows one to estimate the relative contributions of the neutral populations of recycled deuterium to the?D? emission and their Doppler temperatures. Finally, the dependence of the ion and neutral temperatures deduced from the fits and the dominant molecular dissociation channels are discussed as a function of the edge electron density and temperature.