Abstract
Results are presented from Monte Carlo calculations of the electric charge on dust grains ina plasma produced during the slowing down of radioactive decay products of californiumnuclei in neon. The dust grain charging is explained as being due to the drift of electronsand ions in an external electric field. It is shown that the charges of the grains depend ontheir coordinates and strongly fluctuate with time. The time-averaged grain charges agreewith the experimental data obtained on ordered liquid-like dust structures in anuclear-track plasma. The time-averaged dust grain charges are used to carry out computermodelling of the formation of dynamic vortex structures observed in experiments.Evidence is obtained for the fact that the electrostatic forces experienced by thedust grains are potential in character. The paper is supplemented by a video clipshowing the typical dynamics of the simulated vortex dust structure.
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