13 / 2018-04-12 00:09:42

Measurements of Thermal Effects in the Dispersion Relation of the Dust Acoustic Wave (invited talk)

dust acoustic wave,thermal properties

The dust acoustic wave (also known as the dust density wave) is low-frequency, longitudinal mode that propagates through the dust component of the dusty plasma system and is self-excited by the free energy from the ion streaming through the dust component. Over the past twenty years, the dust acoustic wave has been a subject of intense study and recent studies have shown that thermal effects can, in some cases, have a significant role in the measured dispersion relation. In this talk, we report on the results of an experimental study of the dispersion relation of this wave mode over a range of neutral gas pressures in a weakly-coupled dusty plasma system in an rf discharge plasma. The experimental dispersion relation are modeled using a theoretical dispersion relation that includes thermal effects and the effects of dust correlations that arise from the confinement of dusty plasmas in the plasma volume. (K. Avinash, Phys. Plasmas, 22, 033701, 2015)

This work is supported by National Science Foundation Grant Number PHY- 1615420.