Calculation of the Grain Charge Fluctuations in a Dusty Plasma

The time characteristics of grain charging, namely, the relaxation time of the steady grain charge and the charge fluctuations of grains of different sizes, are computed from particle simulations. The results obtained are compared with some theoretical predictions (primarily those derived from the drift-diffusion model). The simulations are carried out for nonmoving and moving two-temperature argon plasmas.