Large-amplitude electrostatic solitary structures in a charge varying dusty plasma with vortex-like ion distribution

摘要

A numerical investigation is presented to show the existence, formation and possible realization of large-amplitude solitary potentials in a charge varying dusty plasma with trapped ion particles. These nonlinear localized structures are self-consistent solutions of the Vlasov equation representing saturated states of a three-stream unstable collisionless dusty plasma. The saturation is provided by an interplay between ion trapping and dust charging. It is found that under certain conditions the effect of dust charge variation can be quite important. In particular, it may be noted that the dust charge variation leads to an additional enlargement of the nonlinear localized structure. Furthermore, our results show that the (just charge variation provides an alternate physical mechanism causing dissipation and as a consequence causes the wave amplitude to decay and transfer to the so-called noise tail.