Greifswald 2009 – scientific programme

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P: Fachverband Plasmaphysik

P 11: Poster: Staubige Plasmen

P 11.3: Poster

Tuesday, March 31, 2009, 17:30–19:30, Foyer des IfP

Spectral properties of Yukawa balls in the presence of dissipation — •Hanno Kählert¹, Christian Henning¹, Sebastian Käding², Yuriy Ivanov², Andre Melzer², and Michael Bonitz¹ — ¹ITAP, Christian-Albrechts Universität zu Kiel, 24098 Kiel — ²Institut für Physik, Ernst-Moritz-Arndt Universität, 17489 Greifswald

The recent discovery of 3D dust crystals [1], which allow precision measurements and direct observation of strong correlation phenomena, excited intensive experimental and theoretical activities [2,3]. The response of these systems to external excitations and also the melting behavior is described by the normal modes and the corresponding excitation spectra [4].

Here, we present a theoretical and experimental analysis of these normal modes of three-dimensional spherically confined Yukawa clusters with particular attention to the influence of dissipation on the mode spectra [5]. We investigate those spectra from a theoretical point of view, and give a quantitative comparison with experimental results. This allows for a sensitive diagnostics of relevant experimental parameters, including particle charge and trap frequency.

[1] O. Arp et al., Phys. Rev. Lett. 93, 165004 (2004)

[2] D. Block et al., Plasma Phys. Control. Fusion 49, B109-B116

(2007)

[3] M. Bonitz et al., Phys. Rev. Lett. 96, 075001 (2006)

[4] S. W. S. Apolinario and F. M. Peeters, Phys. Rev. E 76, 031107

(2007)

[5] C. Henning et al., submitted to J. Phys. A: Math. Gen. (2008)