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

TL;DR

This study uses particle-in-cell simulations to explore how photoemission influences the charging of dust grains in plasma flows, revealing control mechanisms for grain charge and interactions.

Contribution

It introduces a detailed simulation approach to analyze photoemission effects on both conducting and insulating dust grains in plasma flows.

Findings

Photoemission enables charge control on conducting grains.

Photoemission affects charge distribution on insulating grains.

Positively charged grains can have stronger interactions than negatively charged ones.

Abstract

The charging of conducting or alternatively insulating dust grains in a supersonic plasma flow with a directed photon flux is studied by the particle-in-cell method. The electron emission modifies the surface charge distribution on a grain and in the surrounding plasma. The charge and potential distributions on and around a dust grain are studied for different photon fluxes and different angles of the incident unidirectional photons with respect to the plasma flow velocity vector. Continuous and pulsed radiations are considered. We show that photoemission allows controlling the charge on conducting grains, and discuss the charging of stationary and spinning insulating grains. Interactions between positively charged grains can be stronger than for negatively charged grains. The simulations are carried out in two spatial dimensions, treating ions and electrons as individual particles.