Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 17: Dusty Plasmas II

P 17.5: Talk

Wednesday, March 15, 2017, 09:55–10:10, HS 2010

Investigations of size dynamics of nanodust clouds by means of imaging Mie diagnostics — •Sebastian Groth, Franko Greiner, Benjamin Tadsen, and Alexander Piel — Institute of Experimental and Applied Physics, Kiel University, Germany

The long term behavior of plasma-grown nanodust clouds in an argon plasma shows various interesting phenomena once the initial growth process is stopped and the particles remain confined within the plasma discharge.
The investigation of such nanodust clouds with kinetic single-wavelength ellipsometry and extinction measurements at a fixed position show the loss of particles caused by an imperfect confinement and a decrease of the particle size via etching. In addition, a strong variation of the line-integrated dust density is observed. These measurements indicate a dynamic size sorting process due to spatially inhomogeneous etching. Here, this cannot be fully understood using diagnostics at a fixed position. To gain more detailed insight into the dynamics of the entire nanodust clouds a new diagnostic setup with a 2D-imaging rotating-compensator ellipsometer (I-RCE) using a CCD camera has been developed. In this way the spatially resolved in situ determination of all dust properties is possible.

This work was funded by the SFB-TR24 Greifswald-Kiel, Project A2.