激光与光电子学进展, 2018, 55 (5): 051202, 网络出版: 2018-09-11  

加速栅电压对双级加速离子光学系统栅极性能的影响 下载: 1023次

Influence of Accelerator Grid Voltage on Grid Performance of Dual Stage Ion Optical System
作者单位
兰州空间技术物理研究所真空技术与物理重点实验室, 甘肃 兰州 730000
摘要
离子推力器的加速栅电压对加速栅截获电流的大小有影响。目前,离子推力器加速栅电压值是通过实验多次调节确定的,理论计算只能给出加速栅电压最大值。针对兰州空间技术物理研究所研制的双级加速离子推力器开展了加速栅电压的优化设计,利用质点网格法和蒙特卡洛碰撞法(PIC-MCC)开展了8000 s比冲条件下5种加速栅电压(-150,-180,-200,-250,-300 V)对离子运动轨迹、束流发散角、交换电荷(CEX)截获的数量和能量以及加速栅溅射速率的影响研究,根据研究结果确定了最佳加速栅电压为-250 V。最后开展了验证实验,结果表明加速栅电压为-250 V左右时,加速栅电流较小,验证了数值仿真的正确性。
Abstract
The accelerator grid voltage of the ion thruster has an impact on the intensity of the current of accelerator grid. At present, the accelerator grid voltage is chiefly determined through multiple experiments, and the theoretical calculation can only provide the maximum value of accelerator grid voltage. In this paper, the optimum design of the accelerator grid voltage for a dual-stage accelerator ion thruster developed by Lanzhou institute of physics is carried out. Using particle-in-cell method and Monte-Carlo collision method (PIC-MCC method), the effects of five accelerator grid voltages (-150, -180, -200, -250, -300 V) on ion trajectory, beam divergence angle, number and energy of the impingement charge exchange (CEX) ion, and accelerator grid sputtering rate are studied with the specific impulse of 8000 s. The results show that the best accelerator grid voltage is -250 V. Finally, the verification experiment is carried out. The results show that when the accelerator grid voltage is around -250 V, the current of the accelerator grid is small, which verifies the correctness of the numerical simulation.

贾连军, 张天平, 刘明正, 陈娟娟, 贾艳辉. 加速栅电压对双级加速离子光学系统栅极性能的影响[J]. 激光与光电子学进展, 2018, 55(5): 051202. Lianjun Jia, Tianping Zhang, Mingzheng Liu, Juanjuan Chen, Yanhui Jia. Influence of Accelerator Grid Voltage on Grid Performance of Dual Stage Ion Optical System[J]. Laser & Optoelectronics Progress, 2018, 55(5): 051202.

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