Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 17: Plasma Diagnostics II

P 17.6: Talk

Wednesday, March 2, 2016, 16:20–16:35, b305

Measurement of molecular argon ion density at atmospheric pressure — •Torsten Gerling, Markus Becker, Christian Wilke, and Klaus-Dieter Weltmann — INP Greifswald, Deutschland

By observing fast oscillation on the current signal we are able to determine the ion density at an atmospheric pressure plasma source. The discharge is a transient spark with currents up to 2 A and a halfwidth of only 10 ns. This discharge shows oscillations in the current decay phase, which have a declining frequency from 250 MHz down to 50 MHz. This presentation will discuss the origin of this fast oscillation as an ion acoustic wave. We will present the solution of the dispersion relation for these conditions. Based on the solution the limits of observation are computed and the dependencies for the existence discussed. Finally the present possibilities and limitations of this method will be summarized.