Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 19: Poster II

P 19.37: Poster

Thursday, March 31, 2022, 16:00–17:30, P

Analysis of single particle motion confined in the plasma sheath — •Sören Wohlfahrt and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

Microparticles are the essential component of a (dusty) complex plasma. Besides particle-plasma interaction and particle-particle interaction, the dynamics of a single particle are worth to be studied. Particles are typically confined in the plasma sheath, where they accumulate a negative charge that causes levitation in the electric field of the sheath. However, even for perfectly spherical particles the charging process is not isotropic. Small differences in the electron- and ion fluxes can create dipole moments on insulating particles. These dipoles should result in a rotation of the particle [1]. In addition, the particles can have an initial angular momentum due to the injection into the plasma. Thus, we investigate motion of single particles in the plasma sheath. We use angular- and polarization resolved light scattering (APRLS)[2] to analyse the precise motion and orientation of the particle relative to the incident laser beam. This allows us to determine even small deviations from the equilibrium position of the particle and track particle rotation with frequencies up to 500 Hz.

[1] I H Hutchonson, New J. Phys. 6, 43 (2004)

[2] S. Wohlfahrt, D. Block, Phys. Plasmas 28, 123701 (2021)