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首页> 外文会议>Conference Series no.182; International Symposium on the Science and Technology of Light Sources; 20040718-22; Toulouse(FR) >A Study of Radial Cataphoresis and Ion densities in High Power Density Hg-Ar Discharges
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A Study of Radial Cataphoresis and Ion densities in High Power Density Hg-Ar Discharges

机译：高功率密度Hg-Ar放电中的径向电泳和离子密度的研究

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摘要

New types of fluorescent lamps, including both compact and electrodeless lamps, utilise Hg-rare gas discharges at much higher power densities than standard fluorescent lamps. Several plasma physics phenomena, which are relatively unimportant in the plasma of standard fluorescent lamps, become important in high power density Hg-rare gas discharges. Numerical models are playing an increasingly important role in the further development of fluorescent lamp. Plasma models, which have been optimised under standard fluorescent lamp conditions, have not yielded agreement with experiments on high power density Hg-Ar discharges. Radial cataphoresis, electron-ion scattering, ladder like ionization, and deviations from the fundamental spatial mode for both ambipolar diffusion and radiation transport are some of the plasma phenomena which become important at high power density. Radial cataphoresis is very important in low pressure Na-rare gas discharges and Cs-rare gas discharges. Although this phenomena is thought to be well understood, its full impact on an Hg-rare gas plasma may be quite complex. It can result in excitation of higher order spatial modes for ambipolar diffusion of electron-ion pairs, and resonance radiation transport. Radial cataphoresis can even change the colour of a light source under extreme conditions. Radial cataphoresis was observed in this experiment and compared to model predictions.
机译：新型的荧光灯，包括紧凑型和无电极灯，都使用汞稀有气体放电，功率密度比标准荧光灯高得多。在标准荧光灯的等离子体中相对不重要的几种等离子体物理现象在高功率密度的Hg稀有气体放电中变得很重要。数值模型在荧光灯的进一步发展中起着越来越重要的作用。在标准荧光灯条件下进行了优化的等离子体模型，与高功率密度Hg-Ar放电实验的结果不一致。径向电泳，电子离子散射，梯形电离以及双极性扩散和辐射传输都偏离基本空间模式是一些等离子体现象，这些现象在高功率密度下变得很重要。径向电泳在低压Na稀有气体排放和Cs稀有气体排放中非常重要。尽管人们认为这种现象已得到很好的理解，但它对稀有汞气体等离子体的完全影响可能非常复杂。它可能导致激发更高阶的空间模态，以实现电子离子对的双极性扩散以及共振辐射传输。径向电泳甚至可以在极端条件下改变光源的颜色。在此实验中观察到了径向电泳，并将其与模型预测进行了比较。

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