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P: Plasmaphysik

P VI: HV VI

P VI.1: Hauptvortrag

Dienstag, 9. März 2004, 11:00–11:30, H\"orsaal H

Complex Plasmas — •Uwe Konopka, Milenko Rubin-zuzic, Hubertus M. Thomas, and Gregor E. Morfill — Centre for Interdisciplinary Plasma Science, Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching

Microspheres that are injected into a plasma environment charge up due to electron and ion collection. Because of the strong, confining electric sheath fields at the plasma boundaries and due to the inter-particle Coulomb-repulsion, large, locally homogeneous particle clouds can be built up. For sufficiently high cloud densities the plasma behavior is dominated by the strong particle coupling. These system we call “complex plasma” in analogy to complex fluids. Low frequency perturbations, waves, instabilities or regular structure formation of the microspheres can arise. These effects are studied in many ground based as well as in micro gravity experiments like PKE-Nefedov, a micro gravity experiment aboard the International Space Station. Recently, a flow instability looking similar to a turbulent flow have been observed on its kinetic fundamental scale, rising the question, if complex plasmas might even be used as a model system for nano-flow behavior.