Stuttgart 2012 – scientific programme
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P: Fachverband Plasmaphysik
P 19: Komplexe und staubige Plasmen
P 19.3: Talk
Thursday, March 15, 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.