基于发射光谱法的螺旋波电推进器等离子体源放电实验研究

Experimental Research on Plasma Source Discharge of Helicon Wave Electric Thruster Based on Optical Emission Spectroscopy

关键词:  电推进器  螺旋波等离子体  放电实验  工质气体  发射光谱法

Key words:  Electric thruster  Helicon wave plasma  Discharge experiment  Working gas  Optical emission spectroscopy

摘要:

为探究不同气体条件下螺旋波电推进器等离子体源的放电特征，开展了氩气、氦气和氮气放电的光谱诊断实验研究。氩气和氦气为工质气体的放电条件下，部分波长谱线相对强度随功率的增加而增强，且斜率出现两次跳变，考虑是螺旋波放电过程中的模式转换，即容性向感性、感性向波模式的转换。三种工质气体，在较低的压强下，各谱线强度均随压强增大而迅速增强，但氩气放电下压强继续增大达到1.0Pa以后，谱线强度增强趋势变缓甚至达到“饱和”状态，而氦气和氮气放电下压强增大到0.5~0.65Pa，谱线强度出现降低趋势，氦气和氮气放电强度对压强更为敏感。

Abstract:

In order to explore the discharge characteristics of the plasma source of helicon wave electric thruster under different gas conditions， a spectral diagnostic experiment of argon， helium and nitrogen discharges was carried out. Under the discharge condition of argon and helium as working gas， the relative intensity of some wavelength lines increases with the increase of power， and the slope shows two jumps. Considering it is the mode transition in the helicon discharge process， that is， the transition of capacitive-to-inductive and inductive-to-wave modes. For the three working gas， at lower pressures， the relative intensity of each line increases rapidly with the increasing pressure. However， after the pressure continues to increase to 1.0Pa under argon discharge， the line intensity increases slowly or even reaches saturation. The pressure of helium and nitrogen discharge increases to 0.5~0.65Pa， the intensity of the line decreases. And the discharge intensity of helium and nitrogen is more sensitive to pressure.