| 2 cm电子回旋共振离子推力器离子源中磁场对等离子体特性与壁面电流影响的数值模拟 |
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| 引用本文： | 夏旭,杨涓,付瑜亮,吴先明,耿海,胡展.2 cm电子回旋共振离子推力器离子源中磁场对等离子体特性与壁面电流影响的数值模拟[J].物理学报,2021(7):231-237. |
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| 作者姓名： | 夏旭 杨涓 付瑜亮 吴先明 耿海 胡展 |
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| 作者单位： | 西北工业大学航天学院;兰州空间技术物理研究所 |
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| 基金项目： | 国家自然科学基金(批准号:11875222)资助的课题. |
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| 摘 要： | 电子回旋共振离子推力器(electron cyclotron resonance ion thruster,ECRIT)离子源内等离子体分布会影响束流引出,而磁场结构决定的ECR区与天线的相对位置共同影响了等离子体分布.在鞘层作用下,等离子体中的离子或电子被加速对壁面产生溅射,形成壁面离子或电子电流,造成壁面磨损和等离子体损失,因此研究壁面电流与等离子体特征十分重要.为此本文建立2 cm ECRIT的粒子PIC/MCC(particle-in-cell with Monte Carlo collision)仿真模型,数值模拟研究磁场结构对离子源内等离子体与壁面电流特性的影响.计算表明,当ECR区位于天线上游时,等离子体集中在天线上游和内外磁环间,栅极前离子密度最低,故离子源引出束流、磁环端面电流和天线壁面电流较低.ECR区位于天线下游时,天线和栅极上游附近的等离子体密度较高,故离子源引出束流、天线壁面电流和磁环端面电流较高.腔体壁面等离子体分布与电流受磁场影响最小.
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| 关 键 词： | 电子回旋共振离子推力器 磁场结构 粒子模拟 壁面电流 |
Numerical simulation of influence of magnetic field on plasma characteristics and surface current of ion source of 2-cm electron cyclotron resonance ion thruster |
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| Xia Xu,Yang Juan,Fu Yu-Liang,Wu Xian-Ming,Geng Hai,Hu Zhan.Numerical simulation of influence of magnetic field on plasma characteristics and surface current of ion source of 2-cm electron cyclotron resonance ion thruster[J].Acta Physica Sinica,2021(7):231-237. |
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| Authors: | Xia Xu Yang Juan Fu Yu-Liang Wu Xian-Ming Geng Hai Hu Zhan |
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| Affiliation: | (School of Astronautics,Northwestern Polytechnical University,Xi’an 710072,China;Lanzhou Institute of Physics,Lanzhou 730000,China) |
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| Abstract: | The cathode-less miniature electron cyclotron resonance ion thruster(ECRIT)has the advantages of longlife and simple-structure.In the ECRIT ion source,the plasma distribution will affect the beam extraction,and the relative position of the ECR layer determined by the magnetic field structure and the flat-ring antenna together affect the plasma distribution.Due to the sheath,the ions or electrons in the plasma will be accelerated to sputter the surface of wall and induce plasma loss.It is important to investigate the wall currents and plasma characteristics.Therefore,particle-in-cell with Monte Carlo collision(PIC/MCC)model is established in this article to study the influence of the magnetic field structure on the plasma and wall current characteristics of 2-cm ECRIT ion source.The calculation results show that the electrons are confined near the ECR layer of antenna by the magnetic mirror,which leads the plasma to be distributed near the ECR layer.When the ECR layer is located on the upstream side of the flat-ring antenna,the plasma is concentrated between the antenna and magnet rings,and the ion density in front of the grid is lowest,which results in a lower ion beam current extracted from ion source and a lower current on the surface of magnetic ring and antenna.When the ECR layer is located on the downstream side of the flat-ring antenna,the plasma density near the upstream side of the antenna and grid is high,which results in higher ion beam current extracted from the ion source and higher current on the surface of antenna and magnetic ring.The plasma distribution and the total wall current of the ion source are affected weakly by the magnetic field structure.In this magnetic field structure,the ion sputtering on the flat-ring antenna is serious.Although such a magnetic field design can increase the extracted ion beam current,it will shorten the working life of the ion source.In the future,when designing a new thruster,it is necessary to weigh the ion current of extraction and lifetime to select the appropriate magnetic field structure. |
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| Keywords: | electron cyclotron resonance ion thruster magnetic field structure particle-in-cell with Monte Carlo collision simulation surface current |
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