| 不同磁路下微型ECR中和器电子引出的模拟研究 |
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| 引用本文： | 夏旭,杨涓,耿海,吴先明,付瑜亮,牟浩,谈人玮.不同磁路下微型ECR中和器电子引出的模拟研究[J].物理学报,2022(4):164-172. |
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| 作者姓名： | 夏旭 杨涓 耿海 吴先明 付瑜亮 牟浩 谈人玮 |
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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);国家重点研发计划(批准号:2020YFC2201000)资助的课题。 |
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| 摘 要： | 电子回旋共振(ECR)中和器是微型ECR离子推力器的重要组成部分,其引出的电子用于中和ECR离子源的离子束流,避免了航天器表面电荷堆积,并且电子引出性能对推力器的整体性能起着重要作用.为了分析影响微型ECR中和器电子引出的因素,本文建立了二维轴对称PIC/MCC计算模型,通过数值模拟研究不同磁路结构对中和器的电子引出,及不同腔体长度对壁面电流损失的影响.计算结果表明, ECR区位置和引出孔附近磁场构型对中和器的电子引出性能至关重要.当ECR区位于天线上游,电子在迁移扩散中易损失,并且电子跨过引出孔前电势阱所需的能量更高.如果更多磁力线平行通过引出孔,中和器引出相同电子电流所需电压较小.当ECR区被天线切割或位于下游时,电子更易沿磁力线迁移到引出孔附近,从而降低了收集板电压.研究了同一磁路结构下不同腔体长度对电子引出的影响,发现增加腔体长度,使得更多平行轴线的磁力线通过引出孔从而避免电子损失在引出板表面,增加了引出电子电流.研究结果有助于设计合理的中和器磁路和腔体尺寸.
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| 关 键 词： | 电子回旋共振中和器 粒子模拟 磁路 |
Numerical simulation of electron extraction from micro electron cyclotron resonance neutralizer under different magnetic circuits |
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| Xia Xu,Yang Juan,Geng Hai,Wu Xian-Ming,Fu Yu-Liang,Mou Hao,Tan Ren-Wei.Numerical simulation of electron extraction from micro electron cyclotron resonance neutralizer under different magnetic circuits[J].Acta Physica Sinica,2022(4):164-172. |
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| Authors: | Xia Xu Yang Juan Geng Hai Wu Xian-Ming Fu Yu-Liang Mou Hao Tan Ren-Wei |
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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 electron cyclotron resonance(ECR)neutralizer is an important part of the micro ECR ion thruster.The electrons extracted from the neutralizer are used to neutralize the ions extracted from the ECR ion source,thereby avoiding the surface charges accumulating on the spacecraft,and the behaviour of electron extraction affects the overall performance of the thruster.In order to investigate the electron extraction through the orifices of the micro ECR neutralizer,a two-dimensional particle-in-cell with Monte Carlo collision(PIC/MCC)model is established in this work.The effects of different magnetic circuits on the electron extraction of the neutralizer and the influence of different cavity lengths on the wall current loss are studied through numerical simulation.The effects of different magnetic circuit structures on the electron extraction and wall current loss of the neutralizer are studied.The calculation results show that the position of the ECR layer and the magnetic flux lines near the extraction orifices are very important for the electron extraction performance of the neutralizer.When the ECR layer is located upstream of the antenna,electrons are easily lost in migration and diffusion motion,and the energy required for the electrons to cross the potential well before the extraction hole is higher.If more magnetic flux lines pass parallelly through the extraction orifices,the neutralizer requires a small voltage to extract the same electron current.When the ECR layer is cut by the antenna or is located downstream of antenna,more electrons may migrate along the magnetic flux lines to the vicinity of the extraction orifices,thereby reducing the voltage of collector plate.The effects of different cavity lengths on the extraction of electrons under the same magnetic circuit structure are studied.It is found that increasing the length of the cavity allows more parallel-axis magnetic flux lines to pass through the extraction holes to avoid electron loss on the surface of the extraction plate,and thus increasing the extraction electron current.The research results conduce to designing a reasonable neutralizer magnetic circuit and cavity size. |
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| Keywords: | electron cyclotron resonance neutralizer particle-in-cell with Monte Carlo collision simulation magnetic circuit |
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