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P: Plasmaphysik

P 23: Poster: Plasmatechnologie, Plasma-Wand-Wechselwirkung, Staubige Plasmen, Plasmadiagnostik

P 23.16: Poster

Wednesday, March 20, 2002, 17:40–18:40, HZO Foyer

Experimental study of repetitive electrical breakdown in the barrier discharge in air — •Ronny Brandenburg¹, Hans-Erich Wagner¹, Kirill V. Kozlov², and Peter Michel¹ — ¹Institute of Physics, University of Greifswald, 17489 Greifswald, Domstr. 10a, Germany — ²Moscow State University, Department of Chemistry, 119899 Moscow, Russia

The technique of spatially resolved cross-correlation spectroscopy is used to carry out diagnostic measurements of the barrier discharge (BD) in air at atmospheric pressure. Quantitative estimates for electric field strength E(x,t) and for relative electron density n_e(x,t)/n_e^max are derived from the experimentally determined spatio-temporal distributions of the luminosity for the spectral bands of the (0−0) transitions of the 2nd positive system of N₂ (λ= 337.1 nm) and the 1st negative system of N₂⁺ (λ= 391.5 nm). All the measurements and calculations have been performed for a BD with the symmetrical electrode arrangement (No-dqglass-glass No-dq), discharge gap width of 1.2 mm, in flowing synthetic air (80% N₂+20% O₂).

The electric field strength of the streamer grows respectively from 120 Td at the anode to 240 Td at the cathode. The comparison of the main characteristics of the cathode-directed streamer obtained in this work with the corresponding results of computer modeling leads to the conclusion, that it is very important to distinguish between two different modes of a BD operation: single pulse and continuous (repetitive).