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首页> 外文期刊>Physics of plasmas >Effects of negative ions on discharge characteristics of water plasma source for a miniature microwave discharge ion thruster
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Effects of negative ions on discharge characteristics of water plasma source for a miniature microwave discharge ion thruster

机译：阴离子对微波排放离子推进器水等离子体源排出特性的影响

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摘要

This work analyzes the discharge characteristics of water plasma for a miniature microwave discharge ion thruster via three-dimensional particle-in-cell simulations with Monte Carlo collisions. It incorporates the negative ions (H-, O-, and OH-) into the simulation code, aside from the three major positive ion species (H2O+, OH+, and H+), and investigates their effects on the discharge characteristics. On the one hand, the simulation results indicate that H2O+ is the dominant species and the negative ions have little effect on the positive ion density and transport. On the other hand, this study confirms the axial oscillation of the OH- negative ion density, in addition to azimuthal rotation, causing plasma instability with a periodic low-frequency anomalous diffusion. The azimuthal rotation is similar to the phenomena observed in other E x B devices, where the difference in spatial distributions of magnetized electrons and unmagnetized ions causes the local potential hump and the resultant instability. Moreover, the axial oscillation, not observed in the previous study considering only positive ions, is due to the generation of OH- by the charge transfer collision reaction between H2O and H-, and this oscillation frequency is double that of the azimuthal rotation. Both the azimuthal rotation and the axial oscillation result in the periodic double peaks of the potential time evolution. These fluctuations have an influence on electron transport across the magnetic field. Published under license by AIP Publishing.
机译：本作品通过蒙特卡罗碰撞分析了通过三维粒子内仿真进行微型微波排放离子推进器的水等离子体的放电特性。它将负离子（H-，O-和OH-）掺入模拟代码，除了三个主要的阳性离子物质（H2O +，OH +和H +），并研究其对放电特性的影响。一方面，仿真结果表明H2O +是主要物种，负离子对正离子密度和运输几乎没有影响。另一方面，本研究证实了OH-负离子密度的轴向振荡，除了方位角旋转之外，还导致具有周期性低频异常扩散的等离子体不稳定性。方位角旋转类似于在其他E X B器件中观察到的现象，其中磁化电子和未磁力离子的空间分布差异导致局部电位驼峰和所得的不稳定性。此外，考虑到正离子的先前研究中未观察到的轴向振荡是由于在H 2 O和H-之间产生的电荷转移碰撞反应，并且这种振荡频率是方位角旋转的两倍。方位角旋转和轴向振荡均导致潜在时间进化的周期性双峰。这些波动对磁场上的电子传输产生影响。通过AIP发布在许可证下发布。

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