Hannover 2016 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session- Dusty Plasmas

P 10.1: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Pressure dependence for crystallization of an complex plasma under laboratory conditions — Benjamin Steinmüller, Christopher Dietz, and •Markus H Thoma — Justus-Liebig-Universität, Gießen, Deutschland

The influence of neutral gas pressure for crystallization of huge three dimensional complex plasmas under laboratory conditions is investigated. The experiments were performed in a parallel plated radio frequency chamber with a diameter of about 15 cm. For analysis of the phase transition the pair correlation as well as a criteria based on the Bond Order parameters are applied. The crystallization of a complex plasma under gravity conditions shows a strong neutral pressure dependence. At low pressure a two stream instability occurs, while at medium pressures the complex plasma is highly ordered (crystallized). A further increase of the neutral pressure leads to disordering (melting), starting from the upper part and proceeds downwards.