Numerical Simulation of Characteristics of CEX Ions in Ion Thruster Optical System

作者：Zhong Lingwei^*; Liu Yu; Li Juan; Gu Zuo; Jiang Haocheng; Wang Haixing; Tang Haibin

来源：Chinese Journal of Aeronautics, 2010, 23(1): 15-21.

DOI：10.1016/S1000-9361(09)60182-5

• electric propulsion
• ion propulsion
• ion optical system
• particle simulation
• charge exchange collision

Charge exchange (CEX) ions Could inflict severe damages oil the ion thruster optical system. This article is aimed at investigating the characteristics of the CEX ions and their influences upon the optical system by means of particle-in-cell (PIC) ion simulation and Monte Carlo collision (MCC) methods. The results front numerical simulation indicate that despite the fact that CEX ions appear in the entire beamlet region near the ion optical system, the ones that present themselves downstream of the accelerator grid have good reason for attracting more attention. As their trajectories are significantly affected by the local electric field, a great number of CEX ions are accelerated toward grids resulting in sputtering erosion. When the influences of the CEX ions are considered in the numerical simulation, there could hardly be observed augments in the screen grid Current, but the accelerator grid current increases front zero to 1.4% of the beamlet current. It call be understood from the numerical simulation that the CEX ions formed in the region far downstream of the accelerator grid Should be blamed for the erosion on the downstream Surface of the accelerator grid.

• 出版日期2010-2
• 单位北京航空航天大学; 兰州空间技术物理研究所