Particle-in-cell simulations of Hall thruster acceleration and near plume regions
Particle-in-cell simulations of Hall thruster acceleration and near plume regions
复制标题
霍尔推进器加速度和近羽流区域的粒子内模拟
DOI：
10.1063/1.5054009
复制
发表时间：
2018
影响因子：
2.2
通讯作者：
A. Lopez Ortega
中科院分区：
文献类型：
--
作者：
I. Katz;V. Chaplin;A. Lopez Ortega
本文报道了霍尔推力器加速和近羽流区的一维方位角和二维z-θ粒子模拟结果。一维模拟表明，快速移动的电子波驱动相干、大振幅的离子声波。离子波在方位角上变得相干太快，离子声不是原因;相干性来自早期的电子波。仅使用快速移动的主射束离子的2-D模拟导致离子声波振幅比1-D计算中的振幅低得多。在域中以与霍尔推进器参数一致的速率添加少量电离，导致电势分布分成两个不同的区域。在该区域的上游部分，电位分布非常陡峭;在下游部分，电位分布几乎是平坦的。讨论了这两个区域的电子输运，给出了霍尔推力器加速和近羽流区的一维方位角和二维z-θ粒子模拟结果。1-D模拟表明，快速移动的电子波驱动相干，大幅度，离子声波。离子波在方位角上变得相干太快，离子声不是原因;相干性来自早期的电子波。仅使用快速移动的主射束离子的2-D模拟导致离子声波振幅比1-D计算中的振幅低得多。在域中以与霍尔推进器参数一致的速率添加少量电离，导致电势分布分成两个不同的区域。在该区域的上游部分，电位分布非常陡峭;在下游部分，电位分布几乎是平坦的。讨论了这两个区域的电子输运。
The results of 1-D azimuthal, and 2-D z-θ, particle-in-cell simulations of Hall thruster acceleration and near plume regions are reported. The 1-D simulations show that fast moving electron waves drive coherent, large amplitude, ion acoustic waves. The ion waves become azimuthally coherent too quickly for ion sound to be the cause; the coherence comes from early electron waves. 2-D simulations with only fast moving, main beam, ions result in ion acoustic wave amplitudes much lower than those in the 1-D calculations. The addition of a small amount of ionization in the domain, at a rate consistent with Hall thruster parameters, causes the potential profile to divide into two distinct regions. In the upstream portion of the domain, the potential profile is very steep; in the downstream portion, the potential profile is almost flat. Electron transport in the two regions is discussed.The results of 1-D azimuthal, and 2-D z-θ, particle-in-cell simulations of Hall thruster acceleration and near plume regions are reported. The 1-D simulations show that fast moving electron waves drive coherent, large amplitude, ion acoustic waves. The ion waves become azimuthally coherent too quickly for ion sound to be the cause; the coherence comes from early electron waves. 2-D simulations with only fast moving, main beam, ions result in ion acoustic wave amplitudes much lower than those in the 1-D calculations. The addition of a small amount of ionization in the domain, at a rate consistent with Hall thruster parameters, causes the potential profile to divide into two distinct regions. In the upstream portion of the domain, the potential profile is very steep; in the downstream portion, the potential profile is almost flat. Electron transport in the two regions is discussed.