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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.14: Poster

Mittwoch, 22. März 2023, 17:30–19:00, HSZ EG

Investigation of Screw-Like Wave Phenomena in DC-Discharged Plasma with PK-4 — •Lukas Wimmer and Markus H. Thoma — Justus-Liebig-University Gießen, Germany

If micrometer to nanometer-sized microparticles are introduced into a plasma, it is referred to as dusty or complex plasma. The Plasmakristall-4 facility (PK-4) is the fourth and latest version of a successful series of experiments for the fundamental research of complex plasmas. If PK-4 is operated at low pressure, p < 25 Pa, as well as at low energy, and the dust particle size falls below a certain limit, screwed-like wave phenomena appear in ground-based experiments. Local system properties show that the wave structure is caused by the two-stream instability of ions and dust particles, assigned to the regime of dust-acoustic waves, and the superposition of longitudinal and transversal waves causes the curvature of the waves. Deeper analysis gives us information about the ion drag force in the low-pressure regime and the local electric field in the boundary region.