探针特性曲线的初级电子修正及用离子声波速度测电子温度的研究

A Method to Correct the Characteristic Curve of a Langmuir Probe and the Possibility to Measure Plasma Electron Temperature Through Ion-Acoustic Waves

在Te》Ti,且存在两种电子能量的等离子体中,讨论了正确进行朗缪尔探针特性曲线修正--初级电子修正方法;用朗缪尔探针方法得到的等离子体电子温度与离子声波速度测量得到的电子温度分布实验结果比较证明,提出的初级电子修正方法是正确的.实验结果还表明,用离子声波速度测量得到的电子温度误差较小,平均测量误差△Te大约只有0.1eV,有望成为一种可行的电子温度测量方法.

A proper method is proposed in this paper to eliminate the additional electric current by electrons with high energy in the Langmuir V-I characteristic curve when plasma consists of two groups of electrons at different temperatures and under the condition that Te》Ti. The study showed that after this correction the result of electron temperature measured is more reasonable. Another method to obtain electron temperature using Ion-Acoustic Wave speed was also studied in this paper. The ion-acoustic wave in this experiment was excited by either tone-burst test wave method or by CW test wave method. The comparison of the electron temperature of the plasma using the above correction method with that calculated from ion-acoustic wave (IAW) speed shows that the average error of electron temperatures from IAW speed △Te (about 0.1 eV) is much smaller than that from Langmuir V-I characteristic curve (about 0.44eV, after the above mentioned correction). It can be concluded that to make an additional correction is a good way to raise the accuracy of electron temperature measurement while using IAW method seems better in certain cases.