LIPS200离子推力器羽流污染地面试验研究

Ground Simulation of Contamination Induced by Plume of LIPS200 Ion Thruster

为系统地了解离子推力器羽流的沉积、溅射污染效应,评估其污染程度,进而指导离子推力器的安装布置位置,本文对20 cm离子推力器的羽流污染效应进行了地面试验研究。实验内容主要采用石英微量天平测量模拟星体敏感部件及太阳能电池帆板等9处不同位置的溅射、沉积污染率。结果显示离子推力器地面试验沉积效应和溅射刻蚀效应同时存在,在半角72°以外的区域主要表现为沉积效应,在半角32°的位置溅射刻蚀效应明显;溅射率随被测点与推力器束流轴线的夹角的增大成Reynolds分布趋势。

We addressed the mechanisms for the contamination, originated from the plume of LIPS200 ion thruster, with ground simulation experiment for design optimization. The impact of the deposition and sputtering of the ion-thruster plume on the contamination of the sensitive surfaces of satellite and solar panel was experimentally investigated with quartz crystal microbalanee （QCM）. The results show that the axial distance R and ＂half - angle＂ θ significantly affected the coexistence of the sputtering and deposition pollutions. For example, in the region at large R andθ 〉 72°, the deposition pollution dominated;in a region at small R and θ 〈 32°, the sputtering pollution domi- nated. However,the relatively weak contamination, measured at about 52°, revealed a cancellation of the sputtering and deposition. Besides, the plume＇ s sputtering rate was mathematically formulated and theoretically calculated with Reynolds model. The measured and calculated results were found to be in good agreement.