Kiel 2011 – scientific programme

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P: Fachverband Plasmaphysik

P 3: Umwelttechnik / Mikroplasmen / Diagnostik

P 3.1: Invited Talk

Tuesday, March 29, 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 Czarnetzki¹ — ¹Institute 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.