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P: Plasmaphysik

P 28: Astrophysikalische Plasmen; Dichte Plasmen 1; Schwerionen- und lasererzeugte Plasmen 2; Staubige Plasmen 4; Theorie 1

P 28.21: Poster

Wednesday, March 29, 2006, 17:30–19:00, Flure

Thermodynamic properties of screened Coulomb balls — •Henning Baumgartner, Alexei Filinov, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Leibnizstr. 15, D-24098 Kiel

We present an analysis of the influcence of screening on the stability and melting behavior of spherical dust particle clusters (Coulomb balls) [1]. An explanation of our method to obtain thermodynamic properties and an analytical model [2] for the distance fluctuations and melting behavior of the Coulomb balls is given, which is compared to the Monte-Carlo simulation results. In particular, a modified coupling parameter [2] for screened interaction is presented. Furthermore, the influence of different confinements [3-4] on the melting of the Coulomb ball is discussed.

[1] O. Arp, D. Block, A. Melzer and A. Piel, Phys. Rev. Lett. 93 165004 (2004)

[2] M. Bonitz, D. Block, O. Arp, V. Golubnychiy, H. Baumgartner, P. Ludwig, A. Piel and A. Filinov, submitted to Phys. Rev. Lett., preprint at ArXiv: physics/0508212

[3] H. Totsuji, T. Ogawa, C. Totsuji and K. Tsuruta, Phys. Rev. E 72 036406 (2005)

[4] Z. Chen, M.Y. Yu and H. Luo, Physica Scripta 71, 638-643 (2005)