THE INFLUENCE OF HIGH ENERGY ELECTRONS AND CONTAMINATION ON LANGMUIR PROBE DIAGNO-STICS OF GAS DISCHARGED
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摘要: 实验室等离子体参数的探针测量中, 一般只注意作离子电流的修正.实际上, 在某些情况下, 探针污染和灯丝高能电子对测量结果的影响可能大得多.仅仅考虑灯丝高能电子对电子温度测量误差的影响, 传统的方法求出的Te误差可达80%—200%.灯丝高能电子还使得饱和电流的测量误差达70%—150%, 亦即电子浓度的误差.故需要对测得的电子温度和电子浓度作适当的修正.文章还讨论了探针表面污染给测量结果带来的误差.Abstract: In the typical method of Langmuir Probe diagnostics of laboratory plasma, only iorr current correction is made. In fact, some electrons escaped from the filament, are accelerated through DCelectric field, they make electron temperature observed by probe "greater" than its real value. The error of electron temperature distorted by high energy electrons is as large as 80%-200%. At the same time, the measurement error of saturated electron current caused by high energy electrons is 70%-150%, that is also the measurement error of electron density. The error caused by the probe surface contamination is also discussed.
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