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首页> 外文期刊>Journal of Quantitative Spectroscopy & Radiative Transfer >Determination of electron temperature and density at plasma edge in the Large Helical Device with opacity-incorporated helium collisional-radiative model
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Determination of electron temperature and density at plasma edge in the Large Helical Device with opacity-incorporated helium collisional-radiative model

机译：含不透明氦气碰撞辐射模型的大型螺旋装置中等离子体边缘电子温度和密度的确定

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摘要

Spectra of neutral helium in the visible wavelength range are measured for a discharge in the Large Helical Device (LHD). The electron temperature (T_e) and density (n_e) are derived from the intensity distribution of helium emission lines. For that purpose, a collisional-radiative model developed by Sawada et al. [Plasma and Fusion Res. 2010;5:001] which takes the reabsorption effect into account is used. It is found that incorporation of the reabsorption effect is necessary to obtain a set of T_e and n_e giving consistent line intensity distribution with the measurement, and that those parameters obtained vary as the line-averaged n_e changes in the course of time. The position where the helium line emission dominantly takes place is located with the help of T_e and n_e profiles measured by the Thomson scattering system. The result indicates that the emission position is almost fixed at the place where the connection length of the magnetic field lines to the divertor plate leaps beyond 10 m. Because intense neutral atom line emission suggests the vigorous ionization of neutral atoms, the helium line emission location determined here can be regarded as the effective boundary of the plasma.
机译：在大型螺旋装置（LHD）中测量可见光波长范围内的中性氦光谱，以进行放电。电子温度（T_e）和密度（n_e）由氦发射线的强度分布得出。为此，Sawada等人开发了一个碰撞辐射模型。 [等离子和Fusion Res。 [2010; 5：001]考虑了重吸收效果。已经发现，为了获得与测量一致的线强度分布的一组T_e和n_e，必须吸收再吸收效应，并且随着线平均n_e随时间的变化，获得的那些参数也会变化。借助Thomson散射系统测量的T_e和n_e轮廓，可以确定主要发生氦线发射的位置。结果表明，发射位置几乎固定在磁场线到分流器板的连接长度超过10 m的位置。因为强烈的中性原子线发射表明中性原子剧烈电离，所以此处确定的氦线发射位置可以视为等离子体的有效边界。

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