Polarization of a Dust Particle and Surrounded Plasma in an External Electric Field

Numerical investigations of different properties of the system of a dust particle and ion cloud are presented. The model is based on the solution of Newton equations for ion trajectories with Monte-Carlo simulations for the ions initial position, velocity distribution, and mean three path. The calculations of the ion density distribution around a single dust particle were made taking into account the presence of an external electric field. The dust particle charge was calculated self-consistently taking into account the ion and the electron fluxes towards the dust particle. A two-dimensional spatial distribution of the electric potential was found in the assumption of weak spatial anisotropy for the case of a small external electric field. The dipole moment and polarization coefficient of the system of "dust particle - ion cloud" was obtained for different values of the ions mean free path and the external electric field. The results showed that the polarization of such a system is significant, it influences the interaction between different dust particles and should be taken into account. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim