Plasma Density Fluctuation inside a Hollow Anode in an Anode-layer Hall Thruster
Plasma Density Fluctuation inside a Hollow Anode in an Anode-layer Hall Thruster
复制标题
阳极层霍尔推进器中空心阳极内的等离子体密度波动
DOI：
10.2514/6.2006-5170
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Y. Arakawa
中科院分区：
文献类型：
--
作者：
Shigeru Yokota;K. Komurasaki;Y. Arakawa
使用全动态 2D3V 细胞内粒子 (PIC)/直接模拟蒙特卡罗 (DSMC) 代码对空心阳极内的电鞘结构和等离子体动力学进行数值计算。通过将电子和离子视为粒子，分析了阳极表面附近非中性等离子体的时间和空间变化。该代码在中性衰减时间和放电电流波形方面进行了验证。模拟结果表明，在对应于低磁通密度情况的稳定区域中，电子深深地渗透到阳极空心中。然后，由于空心中的高电离率，在阳极表面上形成离子鞘。阳极出口的推进剂利用率估计为 45%。在对应于高磁通密度情况的“电离振荡”区域中，离子鞘层和电子鞘层交替出现。由于缺乏维持放电的电子密度，在阳极表面附近形成了电子鞘层。
Electrical sheath structure and plasma dynamics inside a hollow anode are numerically computed using a fully kinetic 2D3V Particle-in-Cell (PIC) / Direct Simulation Monte Carlo (DSMC) code. By treating electrons and ions as particles, temporal and spatial variations of the non-neutral plasma near the anode surface were analyzed. The code was verified in terms of the neutral decay time and discharge current waveform. The simulation results show that in the stable region, which corresponds to the low magnetic flux density case, electrons penetrated deeply into the anode hollow. Then, an ion sheath is created on the anode surface due to the high ionization rate in the hollow. The propellant utilization by the anode exit is estimated at 45%. In the “ionization oscillation” region, which corresponds to the high magnetic flux density case, an ion sheath and electron sheath appeared alternately. An electron sheath was formed in the vicinity of the anode surface because of the lack of electron density for sustaining discharge.