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Influence of the Decelerator Grid on the Optical Performance of the Ion Thruster

机译：减速器格栅对离子推进器光学性能的影响

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摘要

In order to reduce the erosion of the ion thruster accelerator grid, which is caused by charge-exchange (CEX) ions, the 2-grid optical system is added to a decelerator grid to block the reflux CEX ions. The previous experiment and simulation results have proven that the decelerator grid can effectively reduce the Pit and Groove erosion. However, the influence of the decelerator grid on the optical performance has not yet been studied well. In this paper, a three-dimensional Immersed Finite Element Method-Particle in Cell-Monte Carlo Collision (IFE-PIC-MCC) algorithm was adopted to investigate the effect of the decelerator grid on the optical performance under crossover and normal circumstances. Results show that the decelerator grid has no effect on the focusing state and the distribution of beam ions. It also has little effect on the CEX ions from the upstream and extraction (center) regions. However, it has great influence on the downstream CEX ions. When the upstream plasma number density is small, the decelerator grid will cause most of the downstream reflux CEX ions to impinge on the accelerator grid aperture barrel, resulting in the significant increase of the Barrel erosion of the accelerator grid. With the increase of the upstream plasma number density, the downstream reflux CEX ions tend to impact the downstream surface of the decelerator grid, which means the decelerator grid begins to block the downstream backflow of CEX ions.
机译：为了减少由电荷交换（CEX）离子引起的离子推进器加速器栅格腐蚀，将2栅格光学系统添加到减速器栅格中以阻止回流的CEX离子。先前的实验和仿真结果已经证明，减速器网格可以有效地减少坑和槽的腐蚀。但是，减速器格栅对光学性能的影响尚未得到很好的研究。本文采用三维蒙特卡洛碰撞中的有限浸入有限元方法（IFE-PIC-MCC）算法研究了交叉和正常情况下减速器格栅对光学性能的影响。结果表明，减速器格栅对聚焦状态和束离子的分布没有影响。它也对上游和提取（中心）区域的CEX离子影响很小。但是，它对下游的CEX离子有很大的影响。当上游血浆数密度较小时，减速器栅格将导致大多数下游回流CEX离子撞击在加速器栅格孔筒上，从而导致加速器栅格的机筒腐蚀显着增加。随着上游血浆数密度的增加，下游回流CEX离子趋向于撞击减速器格栅的下游表面，这意味着减速器格栅开始阻止CEX离子的下游回流。

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  • 来源
    《International journal of aerospace engineering》 |2019年第2期|8916303.1-8916303.11|共11页
  • 作者

    Lu Chang; Zhao Yide; Wan Jie; Chu Yuchuan; Zheng Liang; Cao Yong;

  • 作者单位

    Harbin Inst Technol, Sch Mech Engn & Automat, Shenzhen 518055, Peoples R China|Lanzhou Inst Space Technol Phys, Lanzhou 730000, Peoples R China;

    Lanzhou Inst Space Technol Phys, Lanzhou 730000, Peoples R China;

    Harbin Inst Technol, Fundamental Space Sci Res Ctr, Harbin 150001, Heilongjiang, Peoples R China;

    Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R China;

    Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China;

    Harbin Inst Technol, Sch Mech Engn & Automat, Shenzhen 518055, Peoples R China;

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