Experimental Study of Dust Acoustic Waves in the Strongly Correlated Regime

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 $\partial ω/\partial k < 0$. A comparison is made with existing theoretical model.

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