Stuttgart 2012 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 19: Komplexe und staubige Plasmen

P 19.3: Vortrag

Donnerstag, 15. März 2012, 14:55–15:10, V57.02

Grain charging in an intermediately collisional plasma — Sergey Khrapak¹, Panagiotis Tolias², Svetlana Ratynskaia², •Manis Chaudhuri¹, Andrey Zobnin³, Alexander Usachev³, Christian Rau¹, Markus Thoma¹, Oleg Petrov³, Vladimir Fortov³, and Gregor Morfill¹ — ¹Max-Planck-Institut für extraterrestrische Physik, Garching, Germany — ²Royal Institute of Technology, Stockholm, Sweden — ³Joint Institute for High Temperatures, Moscow, Russia

The charges of micron-size particles in the quasineutral bulk plasma of a dc discharge are determined experimentally in a pressure range between 100 and 500 Pa, spanning the transition between the weakly collisional and highly collisional (hydrodynamic) regimes, where the ion mean free path drops below the plasma screening length. The charge is determined using the force balance condition from the measured particle drift velocities in stable particle flows. A simple interpolation formula for the ion flux to the grain in the transitional regime is shown to fit quite well the experimental results.