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Nano and micro meter sized dust particles travelling through the heliosphereat several hundreds of km/s have been repeatedly detected by interplanetaryspacecraft. When such fast moving dust particles hit a solid target in space,an expanding plasma cloud is formed through the vaporisation and ionisation ofthe dust particles itself and part of the target material at and near theimpact point. Immediately after the impact the small and dense cloud isdominated by collisions and the expansion can be described by fluid equations.However, once the cloud has reached micro-m dimensions, the plasma may turncollisionless and a kinetic description is required to describe the subsequentexpansion. In this paper we explore the late and possibly collisionlessspherically symmetric unconstrained expansion of a single ionized ion-electronplasma using N-body simulations. Given the strong uncertainties concerning theearly hydrodynamic expansion, we assume that at the time of the transition tothe collisionless regime the cloud density and temperature are spatiallyuniform. We do also neglect the role of the ambient plasma. This is areasonable assumption as long as the cloud density is substantially higher thanthe ambient plasma density. In the case of clouds generated by fastinterplanetary dust grains hitting a solid target some 10^7 electrons and ionsare liberated and the in vacuum approximation is acceptable up to meter ordercloud dimensions. ...

plasma physics and controlled fusion

On the unconstrained expansion of a spherical plasma cloud turning  collisionless : case of a cloud generated by a nanometer dust grain impact on  an uncharged target in space