Numerical Analysis for Electron Backstreaming Accelerator Grid Limited Voltage for 20cm Xe Ion Thruster Grid System

Journal of Propulsion Technology ›› 2012, Vol. 33 ›› Issue (6): 991-996.

Science and Technology on Vacuum and Cryogenic Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000,China;Science and Technology on Vacuum and Cryogenic Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000,China;Science and Technology on Vacuum and Cryogenic Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000,China;Science and Technology on Vacuum and Cryogenic Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000,China

Published:2021-08-15

离子推力器栅极系统电子反流阈值的数值分析

贾艳辉,张天平,郑茂繁,李兴坤

兰州空间技术物理研究所真空低温技术与物理重点实验室,甘肃兰州 730000;兰州空间技术物理研究所真空低温技术与物理重点实验室,甘肃兰州 730000;兰州空间技术物理研究所真空低温技术与物理重点实验室,甘肃兰州 730000;兰州空间技术物理研究所真空低温技术与物理重点实验室,甘肃兰州 730000

作者简介:贾艳辉(1983—),男,博士,工程师,研究领域为放电等离子电推力器技术与工程。E-mail:jiayh510@163.com
基金资助:
真空低温技术与物理重点实验室基金项目(9140C550211120C5501)。

Abstract

Abstract: Preventing the beam plasma electron of downstream of the accelerator grid from backstreaming is one of the primary effects of the ion thruster accelerator grid negative voltage. The minimum grid voltage that prevents electron from backstreaming is called electron backstreaming limited voltage. The performance and lifetime of ion thruster are directly affected by the accelerator voltage which could be determined by the limited grid voltage.Based on the PIC method,the paper calculated the electron backstreaming threshold voltage of 20cm Xe ion thruster accelerator grid and analyzed the effect of the aperture of the accelerator grid, screen to accelerate grid gap and the single grid aperture extracting beam current on the threshold valuable of accelerator grid. The calculated results coincide well with the experimental values. The computer model can provide reference value in the choosing of the accelerator parameters for the ion thruster design and can establish elements in the analyzing of the accelerator life for the electron back-streaming.

Key words: Ion thruster;Accelerator grid;Electron backstreaming;PIC method

摘要： 阻止束流等离子体中电子反流到加速栅上游区域是离子推力器加速栅负电压的主要作用之一,能够阻止电子反流的加速栅电压最小值称为电子反流阈值。加速栅电压的选择直接影响到离子推力器的工作性能和运行寿命,电子反流阈值电压是确定加速栅电压的重要参考参数。基于PIC方法计算了20cm氙离子推力器加速栅电子反流阈值,并分析了加速栅孔径、栅间距、单孔引出束流电流大小对加速栅电子反流阈值电压的影响,计算结果与试验测量值符合较好。该数值模型为加速栅参数的选择和降低电子反流失效风险方法提供了参考,为下一步电子反流现象对加速栅寿命的预测分析奠定了基础。

关键词: 离子推力器;加速栅;电子反流;PIC方法

贾艳辉,张天平,郑茂繁,李兴坤. 离子推力器栅极系统电子反流阈值的数值分析[J]. 推进技术, 2012, 33(6): 991-996.

References

[1] Kaufman H R.Technology of Electron-Bombardment Ion Thrusters[J].Advances in Electronics and Electron Physics, 4,6:266-373.
[2] Williams, Goebel D M, Wilbur P J.Analytical Model of Electron Backstreaming for Ion Thrusters[R].AIAA 2003-4560.
[3] Yasushi Okawa, Haruki Takegahara, Takeshi Tachibana.Numerical Analysis of Ion Beam Extraction Phenomena in an Ion Thruster[R].IEPC 2001-097.
[4] Wang J, Anderson J , Polk J.3D Particle Simulations of Ion Optics Plasma Flow[R].AIAA 2005-3799.
[5] Brophy J R, Katz I, Polk J E.Numerical Simulations of Ion Thruster Accelerator Grid Erosion[R].AIAA 2002-4261.
[6] Kafafy R, Wang J.Whole Subscale Ion Optics Simulation Direct Ion Impingement and Electron Back Streaming[R].AIAA 2005-3691.
[7] Sengupta A, Brophy J R, Goodfellow K D.Status of the Extended Life Test of the DS1 Flight Spare Ion Engine After 30352 hour of Operation[R].AIAA 2003-4558.
[8] Brophy J R, Polk J E.Ion Engine Service Life Validation by Analysis and Testing[R].AIAA 96-2715.
[9] 钟凌伟,刘宇,王海兴,等.电荷交换离子对栅极系统束流影响的数值研究[J].航空动力学报,2009,24(8):1911-1916.
[10] Yasutaka I, Toshiyuki O.Particle Simulation for Ion Thruster Grid Design[R].IEPC 2001-101.
[11] Jonathan L, Noord V.Lifetime Assessment of the NEXT Ion Thruster[R].AIAA 2007-5274.
[12] Wang J, Polk J, Brophy J, et al.Three-Dimensional Particle Simulations of Ion-Optics Plasma Flow and Grid Erosion[J].Journal of Propulsion and Power,3,9(6).
[13] 贾艳辉,张天平,李小平.离子推力器加速栅寿命概率性分析[J].推进技术,1,2(6):766-769.(JIA Yan-hui, ZHANG Tian-ping, LI Xiao-ping.Probabilistic Evaluation of Ion Thruster Accelerator Grid Life[J].Journal of Propulsion Technology,1,2(6):766-769.)
[14] 郑茂繁,江豪成,顾左,等.20cm氙离子推力器3000h寿命实验[J].航天器环境工程,2009,8(4):374-377.