Non‐ideal Effects in Streaming Bi‐Dust Acoustic Instability

Streaming dust acoustic instabilities in the presence of a dust beam in a weakly non‐ideal dusty plasma have been studied considering a new form for the state equation with two kind of grains. Fluctuating charging effects are not considered in this work. Homogeneous dust‐acoustic waves (DAWS) are studied for a perturbed plasma in a very low frequency regime, where dusty plasmas support new kind of waves and instabilities due to the dust collective dynamics. In this analysis a fluid model is used and electrons and ions are determined by their Boltzmann factors in order to find an adequate dispersion relation, which has several parameters depending of the state equation constants. In this paper we use the state equation structured by Ree and Hoover using Pade approximant for a hard‐sphere gas in the form P = nT (1 + nb0 1 + a1b0n + a2b02n21 − b1b0n + b2b02n2) is applied, where b0 is calculated by the second virial term for the hard‐core model. This type of equation is more accurate than other expressions an...