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The charging of conducting or alternatively insulating dust grains in asupersonic plasma flow with a directed photon flux is studied by theparticle-in-cell method. The electron emission modifies the surface chargedistribution on a grain and in the surrounding plasma. The charge and potentialdistributions on and around a dust grain are studied for different photonfluxes and different angles of the incident unidirectional photons with respectto the plasma flow velocity vector. Continuous and pulsed radiations areconsidered. We show that photoemission allows controlling the charge onconducting grains, and discuss the charging of stationary and spinninginsulating grains. Interactions between positively charged grains can bestronger than for negatively charged grains. The simulations are carried out intwo spatial dimensions, treating ions and electrons as individual particles.

Charging of insulating and conducting dust grains by flowing plasma and photoemission