静电探针测量强流电子束电离气体产生的等离子体密度

USING LANGMUIR PROBE TO DIAGNOSE PLASMA PRODUCED BY RELATIVISTIC ELECTRON BEAM IONIZING NEUTRAL GAS

用电离理论和核物理学中讨论电子束通过介质后的能量损耗的方法 ,分别估算了强流电子束电离中性气体产生的等离子体的密度。在实验中将静电探针应用于测量强流电子束电离氮气产生的等离子体的密度 ,得出等离子体密度随气压变化的曲线。实验结果表明在1～ 1 5Pa气压范围内 ,等离子体密度在 1 0 10 ～ 1 0 11cm-3 量级 ,与理论结果相符 ,证明静电探针用于诊断强流相对论电子束电离中性气体产生的等离子体的密度是可行的。

We estimated the plasma density produced by relativistic electron beam (REB) ionizing neutral gas, using both ionization theory and another method employed often to study energy losses of electron beam transporting through matter in nuclear physics. On experiment, Langmuir probe is employed to measure the plasma density produced by IREB ionizing N 2, and the curve that plasma density varies with gas pressure was obtained. The experimental results indicate that plasma density in low pressure (1～15Pa) region is in the order of 10- 10～10- 11cm- -3, which coincides with theoretical estimation, and the method using probe to diagnose plasma produced by IREB ionizing neutral gas was feasible.