Temperature measurement of a dust particle in a RF plasma GEC reference cell

TL;DR

This paper presents a method to measure the temperature of a dust particle in a plasma by analyzing its motion and separating random thermal fluctuations from coherent plasma-induced signals.

Contribution

It introduces a technique to distinguish between random Brownian motion and plasma-induced signals for accurate dust particle temperature measurement.

Findings

Successful separation of random and coherent motions

Application of mean square displacement analysis

Enhanced accuracy in dust temperature estimation

Abstract

The thermal motion of a dust particle levitated in a plasma chamber is similar to that described by Brownian motion in many ways. The primary differences between a dust particle in a plasma system and a free Brownian particle is that in addition to the random collisions between the dust particle and the neutral gas atoms, there are electric field fluctuations, dust charge fluctuations, and correlated motions from the unwanted continuous signals originating within the plasma system itself. This last contribution does not include random motion and is therefore separable from the random motion in a normal temperature measurement. In this paper, we discuss how to separate random and coherent motion of a dust particle confined in a glass box in a Gaseous Electronic Conference radio frequency reference cell employing experimentally determined dust particle fluctuation data analyzed using the mean square displacement technique.