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Kiel 2011 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 3: Umwelttechnik / Mikroplasmen / Diagnostik

P 3.1: Hauptvortrag

Dienstag, 29. März 2011, 10:30–11:00, HS H

Spatially and temporally resolved spectroscopic investigations on a thin-cathode high current density micro-discharge — •Beilei Du1, Sebastian Mohr1, Yusuf Celik1, Dirk Luggenhölscher1, Mitsutoshi Aramaki2, Nader Sadeghi3, and Uwe Czarnetzki11Institute for Plasma and Atomic Physics, Ruhr-University Bochum, 44780 Bochum, Germany — 2Department of Electrical Engineering and Computer Science, Nagoya University, Nagoya 464-8603, Japan — 3LSP(UMR 5588), Université J. Fourier & CNRS, Grenoble, France

Atmospheric pressure micro thin-cathode discharges in Argon exhibit an self-pulsing behavior. Current pulses of up to 30 A and about 2 ns durations create plasma densities in the range of several 1016 cm−3. Current densities reach several 105 A/cm2. Spatially and temporally resolved emission and diode laser absorption spectroscopic measurements are performed over the cross section and the longitudinal axis of the discharge. The measurements reveal not only the spatial structure of the discharge but yield also information on metastable, ion density, cathode material, and neutral gas temperature distributions. The experimental high spatial resolution techniques are introduced and the results are discussed in detail. - This work was supported by the "German Research Foundation" (DFG) in the frame of the "Research Unit FOR 1123 - Physics of Microplasmas", the Research Department "Plasmas with Complex Interaction" of the Ruhr-University Bochum, and the Research School of the Ruhr-University Bochum.

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