Hannover 2010 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Poster: Dusty Plasmas

P 7.1: Poster

Dienstag, 9. März 2010, 16:00–18:00, Lichthof

Fluid modes in a spherically confined Yukawa plasma — •Hanno Kählert and Michael Bonitz — ITAP, Christian-Albrechts Universität zu Kiel, 24098 Kiel

The normal modes of 3D dust crystals (so-called Yukawa balls) have recently been measured in experiments [1]. They can be used to determine important parameters such as the particle charge or the frequency of the confinement potential. Here we present a theoretical analysis of the normal modes of a spherically confined Yukawa plasma based on the solution of the linearized fluid equations, which has previously been performed for confined ions [2]. The mode frequencies are found to depend solely on the normalized cluster size κ R, where R is the cluster radius [3] and κ the inverse Debye length. In the Coulomb limit the results of [2] are recovered. The fluid modes are compared to the exact crystal eigenmodes computed from the Hessian matrix of the discrete N-particle system.

[1] Yu. Ivanov and A. Melzer, Phys. Rev. E 79, 036402 (2009)

[2] D. H. E. Dubin, Phys. Rev. Lett. 66, 2076 (1991)

[3] C. Henning et al., Phys. Rev. E 74, 056403 (2006)