Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Low Pressure Plasmas II

P 16.3: Vortrag

Mittwoch, 7. März 2018, 14:45–15:00, KI 1.174

IVDF and plasma parameters of CX dominated plasmas — •Christian Lütke Stetzkamp, Tsanko Vaskov Tsankov, and Uwe Czarnetzki — Institute for Plasma and Atomic Physics, Ruhr University Bochum, D-44780 Bochum, Germany

The properties of many laboratory plasmas are determined by charge-exchange collisions. Recently Tsankov and Czarnetzki [1] developed a new diagnostic technique for this kind of plasmas. It allows a spatially resolved access to the ion velocity distribution functions (IVDF) and the plasma parameters by a single, non-invasive measurement at the wall.

Here, their work is improved and extended. The obtained results reproduce the previous measurements in a Neon plasma, however, with an increased resolution. Further, a relation between the electric field and the drift velocity is obtained and a criterion for the validity of the diagnostic is derived. Based on this criterion measurements in an Argon plasma are performed under conditions where the technique is applicable. The radial variations of the plasma parameters obtained through the diagnostic are presented. The radial measurements are complemented by axial ones, which are needed for the evaluation of the radial data.

[1] Tsankov, Ts. and Czarnetzki, U. 2017 Plasma Sources Sci. Technol. 26 055003