Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session - Helmholtz Graduate School for Plasma Physics

P 17.16: Poster

Mittwoch, 19. März 2014, 16:30–18:30, SPA Foyer

Selective fluid mode excitation in finite 3D Yukawa-balls — •Matthias Mulsow, André Schella, and André Melzer — Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Felix-Hausdorff-Straße. 6, D-17487 Greifswald

In low-temperature plasmas micrometer-sized particles are able to form highly ordered structures. Using a harmonic three-dimensional trapping potential strongly coupled finite systems can be created, the Yukawa-balls. An established model to describe the dynamic properties of these finite crystal-like structures are normal modes. Here the possible oscillations of all individual particles are composed to describe the collective motion.

In opposite to this, Kählert and Bonitz recently proposed [1,2] to consider the cluster as a uniform cold fluid droplet, neglecting the movement of single particles. The collective motions are then interpreted as superpositions of orthonormal fluid modes.

In our experiments, we utilize a special cuvette with conducting corners to manipulate the cluster using electrical fields in a uniform way that copes perfectly with the fluid mode approach. Thus, on the one hand theoretical predictions concerning mode resonance can be tested while on the other hands new scenarios to manipulate three dimensional Yukawa-balls can be developed in order to gain new insights on their dynamic properties.

[1] H. Kählert and M. Bonitz, Phys. Rev. E 82, 036407 (2010)

[2] H. Kählert and M. Bonitz, Phys. Rev. E 83, 056401 (2011)