Numerical simulations of the charging of dust particles by contact with hot plasmas
Other literature type
Miloch, W. J.
Pécseli, H. L.
(issn: 1607-7946, eissn: 1607-7946)
arxiv: Physics::Plasma Physics
Charging of individual dust particles in contact with hot plasmas is studied
by numerical methods. The dust particle is treated as a rigid solid body,
composed by either perfectly insulating or conducting material. The
collisionless plasma, consisting of electrons and singly charged ions, is
simulated by Particle-in-Cell methods in two spatial dimensions. It is
demonstrated that the surface conditions, i.e. roughness, of the dust particles
are significant for the charging. In a streaming plasma, a dust
grain develops an electric dipole moment which varies systematically with
the relative plasma flow. The strength and direction of this dipole moment
depends critically on the material. We observe also Langmuir oscillations
excited in the vicinity of the particles, and analyze the spatial variation
of their spectral distribution.