Vol. 29, issue 02, article # 13

Abstract:

Gasdynamic processes that take place at a pulse-periodic discharge initiated by runaway electrons in atmospheric pressure air were studied with a laser monitor based on a CuBr laser. Voltage pulses (U = 13 kV, FWHM is 10 ns, front duration is 4 ns, negative polarity, f = 60–3200 Hz) applied to a cone copper cathode with diameter of cone base, apex angle, and corner radius of cone apex of 6 mm, 30°, and 0.2 mm, respectively. A flat copper anode was located at a distance of 2 mm from the cathode. It was established that products of discharge plasma with copper vapors are transferred in radial direction along a surface of the flat anode during 2.5 ms to a distance of 24 mm. The temperature of air heated by the discharge in the moment of its expanding was ~ 1 × 10³ K. It was shown that use of the laser monitor in transmitted light allows obtaining contrast images of optical inhomogeneities that arise at a gas discharge.

Keywords:

nanosecond pulse-periodic discharge, atmospheric pressure air, runaway electrons, schlieren method, laser monitor, copper bromide laser, metal vapor jets, colored mini jets

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