Bremen 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 3: Dusty Plasmas I

P 3.1: Hauptvortrag

Montag, 13. März 2017, 14:00–14:30, HS 1010

Numerical studies of plasma-object interactions — •Wojciech Miloch — Department of Physics, University of Oslo, Norway

Interaction of plasma with finite-sized objects is one of main problems in plasma physics. Objects immersed in plasma will be charged by plasma and other currents, a sheath will form in their vicinity, and plasma parameters will be modified locally. Detailed understanding of the plasma-object interactions is important for a number of problems, including plasma diagnostics by probes, spacecraft performance, plasma processing, or dynamics of dust grains in complex (dusty) plasmas.

The relative motion of an object and plasma breaks the symmetry of charging, and gives rise to the wake in plasma density and potential. The object charging and wake formation are often nonlinear processes, and to study them, first principle kinetic numerical simulations should be considered. Such simulations can be carried out with the particle-in-cell (PIC) method, where trajectories of a large number of plasma particles are followed in self-consistent force fields. In this work, I focus on the object charging in flowing plasmas and wakefield effects, and present recent results from self-consistent PIC simulations. Problems that are addressed include spacecraft-plasma interaction, the role of wakes in data acquisition and instrument performance, charging of several dust grains, and the role of magnetic field in the wake formation.