Experimental Study of Dust Acoustic Waves in the Strongly Correlated Regime

Abstract

Low frequency dust acoustic waves (DAW) were excited in a laboratory argon dusty plasma by modulating the discharge voltage with a low frequency AC signal. Metallic graphite particles were used as dust grains and a digital FFT technique was used to obtain dispersion characteristics. The experimental dispersion relation shows the reduction of phase velocity and a regime where $\partial \omega /\partial k<0$. A comparison is made with existing theoretical model.

arXiv commentIt contains four pages with three figures