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arXiv 1607.04843physics.plasm-ph
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电子-中性弹性碰撞对离子污染圆柱形电子云不稳定性的影响:2D 3V PIC-with-MCC模拟

Influence of electron-neutral elastic collisions on the instability of an ion-contaminated cylindrical electron cloud: 2D3V PIC-with-MCC simulations

Meghraj Sengupta, Rajaraman Ganesh

摘要:

本文是一个基于模拟的调查的影响,弹性碰撞和有效的弹性-研究了电子和背景中性粒子之间的激发碰撞对圆柱形捕获的电子云动力学的影响,其中电子云中还混合有离子污染物。碰撞对不稳定性的影响可以从背景中性粒子的存在引起的离子共振不稳定性的增长率和能量的改变中看出与真空背景相比。此外,为了理解非电离碰撞是否可以独立地成为电子云不稳定的原因,用纯电子等离子体进行第二组数值实验,该纯电子等离子体与不同密度的背景中性粒子进行非电离碰撞。这些实验表明,从电子云的非电离碰撞的势能提取的性质是不相似的其他不稳定过程\textit{e.g.}的势能提取的电阻壁不稳定性。能量提取过程中的这种差异使得这些非电离碰撞不能独立地触发云的不稳定性。

英文摘要:

This paper is a simulation based investigation of the effect of elastic collisions and effectively elastic-like excitation collisions between electrons and background neutrals on the dynamics of a cylindrically trapped electron cloud that also has an ion contaminant mixed in it. Effects of the collisions on the instability are evident from alteration in the growth rate and energetics of the ion resonance instability caused by the presence of background neutrals as compared to a vacuum background. Further in order to understand if the non-ionizing collisions can independently be a cause of destabilization of an electron cloud, a second set of numerical experiments were performed with pure electron plasmas making non-ionizing collisions with different densities of background neutrals. These experiments reveal that the nature of potential energy extraction from the electron cloud by the non-ionizing collisions is not similar to the potential energy extraction of other destabilizing processes \textit{e.g.} a resistive wall instability. This difference in the energy extraction process renders these non-ionizing collisions incapable of independently triggering an instability of the cloud.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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