标题： 利用尘埃粒子垂直链研究尾场 显示英文标题

标题： Using dust particle vertical chains for wakefield investigation

摘要： 尘埃颗粒常常由于等离子鞘层中流注离子产生的尾场影响而形成垂直链。 这些粒子链被证明是一种独特的诊断工具，可用于研究等离子鞘层内离子尾场基本性质背后的物理机制。 本文提出了一种用于研究离子尾场的实验方法，该方法采用了一种新的振荡技术，旨在扰动一个由两颗粒子组成的垂直链。 使用这种方法，通过下电极上的外部直流偏置产生阻尼自由落体振荡。然后利用快速傅里叶变换对收集到的振荡数据进行频谱分析，并识别出质心振荡。 显示英文摘要

摘要： Dust particles often form vertical chains due to the influence of the wakefield produced by the streaming ions in the plasma sheath. These particle chains are proving useful as a unique diagnostic tool for investigating the physics behind the basic properties of the ion wakefield within the plasma sheath. In this paper, an experimental method is presented for investigating the ion wakefield which employs a new oscillation technique designed to perturb a two-particle vertical chain. Using this technique, damped free fall oscillations are generated via an external DC bias to the lower electrode. A fast Fourier transformation is then used to produce a spectrum from the collected oscillation data and a center of mass oscillation is identified.