Investigation of Dusty Plasma Based on the Ornstein—Zernike Integral Equation for a Multicomponent Fluid

Abstract

The electrostatic interaction between charged particles in a dusty plasma has been studied using the Ornstein—Zernike integral equation for a multicomponent plasma. The transition to the one-component approximation has been performed for the nonideal plasma subsystem. It has been shown that the interaction between charged plasma particles at the coupling parameter Γ of the dust subsystem less than unity is well described by the Debye potential with the complete screening constant. The static dielectric function in the region of low wavenumbers becomes negative at Γ > 1 and this region expands with increasing Γ. As a result, attraction between likely charged particles and repulsion between oppositely charged ones occur in a certain distance range. In this case, the total pressure, specific heat at constant volume, and isothermal compressibility of the dusty plasma remain positive in the entire studied range of the nonideality parameter Γ < 250, but the isothermal compressibility of only the dust nonideal subsystem becomes negative at Γ ≈ 2.