Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Correlation dynamics in plasmas and clusters II
A 6.3: Hauptvortrag
Montag, 12. März 2012, 15:00–15:30, V57.01
Shell Formation Dynamics of a Spherical Yukawa Plasma — •Hanno Kählert1,2 and Michael Bonitz1 — 1Christian-Albrechts-Universität zu Kiel — 2Heinrich-Heine Universität Düsseldorf
Dusty plasmas allow for a fully kinetic investigation of various processes in strongly coupled plasmas—including their dynamics on short time scales. Here, we focus on the time-dependent correlation buildup in spherical dust clusters (’Yukawa Balls’). Starting from a laser-heated initial state, we investigate the time evolution of the dust
cloud by Langevin dynamics simulations [1,2]. Due to friction with the neutral gas, the dust particles reach a strongly coupled state in the long-time limit with a well-defined radial shell structure [3]. For short and intermediate times, the simulations show that the cooling
process is accompanied by a breathing oscillation of the plasma which manifests itself as a periodic modulation of the dust density. Special attention is paid to the influence of the screening parameter on the order of shell formation, and comparisons are made between closely related processes in ultracold neutral plasmas [4] and confined ion
plasmas.
H. Kählert and M. Bonitz, Phys. Rev. Lett. 104, 015001 (2010)
H. Kählert and M. Bonitz, Contrib. Plasma Phys. 51, 519 (2011)
M. Bonitz, C. Henning, and D. Block, Rep. Prog. Phys. 73, 066501 (2010)
T. Pohl, T. Pattard, and J. M. Rost, Phys. Rev. Lett. 92, 155003 (2004)