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arXiv 2203.01873physics.plasm-phphysics.comp-ph
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束流中和中三维静电孤立波和表面波的动力学模拟

Kinetic modeling of three-dimensional electrostatic-solitary and surface waves in beam neutralization

Nakul Nuwal, Deborah A. Levin, Igor D. Kaganovich

摘要:

本工作研究了基本的等离子体过程中所涉及的离子束的空间电荷由灯丝发射的电子使用粒子在细胞模拟。虽然灯丝中和是经济的,但以前的实验表明,在这个过程中会激发出各种波,从而限制了空间电荷中和。在这项工作中,静电孤立波(ESW),具有低耗散率的形成和运动,其特征在于为二维平面和三维圆柱形光束,并观察到产生的波,生存了很长一段时间,减缓的过程中的束中和。此外,通过一维Bernstein-Greene-Kruskal(BGK)的分析,我们发现,非麦克斯韦性质的束电子产生的大尺寸ESW是不预测的理论,假设电子可以描述由麦克斯韦分布。我们的PIC模拟是足够敏感的,能够解决重要的三维效果,在一个3D圆柱形的几何形状,导致激发的Trivelpiece-Gould表面波由于高能电子存在于中和开始。

英文摘要:

This work studies the fundamental plasma processes involved in the neutralization of an ion beam's space-charge by electrons emitted by a filament using Particle-in-Cell simulations. While filament neutralization is economical, previous experiments have shown that a variety of waves become excited in this process that limit the space-charge neutralization. In this work, the formation and movement of electrostatic solitary waves(ESWs), which have low dissipation rates, are characterized for 2D planar and 3D cylindrical beams and are observed to generate waves that survive for a long time and slow the process of beam neutralization. Further, through a 1D Bernstein-Greene-Kruskal (BGK) analysis, we find that the non-Maxwellian nature of the beam electrons gives rise to large-sized ESWs that are not predicted by theory which assumes that the electrons may be described by a Maxwellian distribution. Our PIC simulations are sufficiently sensitive to be able to resolve important three-dimensional effects in a 3D cylindrical geometry that lead to the excitation of Trivelpiece-Gould surface waves due to high-energy electrons present at the beginning of neutralization.

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