| 摘要: |
| 离子光学系统的离子束引出过程是离子推力器重要的物理过程,该过程直接关系到推力器的推力、比冲、效率等参数。为研究离子在离子推力器光学系统中的运动特性,使用了基于IFE-PIC(Immersed Finite Element Particle-In-Cell)的离子推力器光学系统离子束引出过程的三维数值计算模型,计算了栅极间电场分布、电荷密度,栅极冲击电流及欠聚焦极限。计算结果表明,当屏栅极电压不同时,发生欠聚焦的等离子束电流也不同。在欠聚焦工况下,一部分离子与栅极碰撞,产生冲击电流。冲击电流随电离室等离子体数密度增加而增大。 |
| 关键词: 离子推力器 光学系统 冲击电流 欠聚焦 |
| DOI： |
| 分类号: |
| 基金项目:真空低温技术与物理重点实验室基金(9140C5504050902)；国家自然科学基金(10875034)。 |
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| Numerical simulation of perveance impingement current for ion thruster |
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LI Juan1, LIU Yang2, CHU Yu-chuan2, CAO Yong2
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1.Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000, China;2.Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China
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| Abstract: |
| The ion extraction process is a critical physical process in the ion thruster. It directly affects the thrust, specific impulse and efficiency, etc. Based on Immersed Finite Element Particle-In-Cell (IFE-PIC) method, a three dimensional numerical model is adopted to investigate the plasma flow in an ion optics system of ion thruster. The simulation results reveal the electrostatic field distribution, ion density distribution and impingement current on the accelerator grid of the optical system. It is shown that impingement current on the accelerator grid increases when ion density of discharge chamber increases. |
| Key words: Ion thruster Optical system Impingement current Perveance |
