Using dust particle vertical chains for wakefield investigation

TL;DR

This paper introduces an experimental method using dust particle vertical chains and oscillation techniques to investigate ion wakefields in plasma sheaths, providing a novel diagnostic approach.

Contribution

A new oscillation method employing external bias and Fourier analysis for probing ion wakefields with dust particle chains.

Findings

Successful generation of damped oscillations in particle chains

Identification of center of mass oscillation frequencies

Potential for improved plasma diagnostics

Abstract

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.