Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 3: Dusty Plasmas I

P 3.5: Talk

Monday, March 13, 2017, 15:25–15:40, HS 1010

In Operando Size Measurements of Single Microparticles in Plasmas — •Oguz Han Asnaz, Hendrik Jung, Franko Greiner, and Alexander Piel — Institute of Experimental and Applied Physics, Kiel University, Germany

In recent years ever more precise measurements of single dust particles in a plasma environment became possible. The goal of these experiments is the usage of particles as small probes for determining several plasma properties. With the gain in precision, the accuracy of manufacturer’s data about the particles dimensions became a limiting factor. Therefore, in operando measurements of the microparticles are needed. In this contribution two such methods are demonstrated. Using a long distance microscope, single particles are imaged from outside the plasma chamber. In combination with phase-resolved resonance measurements [1] it is possible to determine the particle mass. Since this method can be used in operando, it is possible to analyze the long-term evolution of spherical and non-spherical particles during plasma exposure over several hours. For smaller spherical particles interferometric techniques based on Mie-scattering offer finer resolution by resolving the angular scattering pattern of the particle.

This work was funded by the DFG within the SFB-TR24, project A2.

[1] H. Jung et al., J. Plasma Phys. 82 (2016)