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P: Fachverband Plasmaphysik

P 18: Complex plasma and Low-temperature plasma and applications 2

P 18.3: Vortrag

Donnerstag, 12. März 2020, 12:00–12:25, b302

Experimental Studies of Phase Separation in Binary Dusty Plasmas under Microgravity — •Stefan Schütt and André Melzer — University Greifswald, Germany

Dusty plasma experiments under microgravity conditions allow to study the dynamics of individual particles in three-dimensionally extended systems. Such dusty plasmas typically contain one species of monodisperse dust particles. Adding a second species of monodisperse particles of different size allows to study phase separation processes. Those binary systems exhibit phase separation even for small relative size disparities of about 3%. Particles marked with a fluorecscent dye are used for one of the species. This makes it possible to distinguish between the species despite their small size disparity using a two-camera video microscopy setup and appropriate filters. The availability of high-resolution, high-speed cameras allows to track single particles during the separation process. As the particle number density as well as the flux are available, diffusion coefficients can be determined. Additionally, a method is presented that does not rely on particle tracking and therefore is much faster. A systematic study of phase separation at different size disparities made possible by this method is shown. This work was supported by DLR under grant no. 50WM1638.