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P: Fachverband Plasmaphysik

P 15: Staubige Plasmen

P 15.4: Vortrag

Mittwoch, 21. März 2007, 15:20–15:35, 6F

Experiments on small scale dynamics of 3D Coulomb Balls. — •Yuriy Ivanov, Sebastian Käding, and Andre Melzer — Institut für Physik Domstr. 10a 17489 Greifswald

Coulomb Balls are 3D finite spherical dust systems in laboratory plasmas. The dynamical investigation of such systems requires the application of a 3-camera system to record particle trajectories with high spatial and temporal resolution. Here, we present the experimental normal modes of the 3D Coulomb Ball. The normal modes have been derived from the thermal Brownian motion of the particles around their equilibrium positions. They allow to assess the particle charge and confinement potential, the dominant parameters of the dust system. One of the biggest problems here is to identify in a reliable manner the corresponding particles in all three cameras for clusters with more than 50 particles. Moreover, owing to the small scale of the investigating particles dynamics, a careful algorithm for the particle position extraction is needed.