Abstract
We present experimental studies of the spectral characteristics of a pulsed discharge in helium at atmospheric pressure. The transition of the discharge from the volumetric combustion stage to the channel stage has been studied. We showed that cathode spots of a hemispherical shape appear in the stage of a high-current regime of burning a discharge with flat electrodes with a radius of curvature $R=30$ cm. Vapor lines of electrode material has been detected in the emission spectrum of the near-cathode plasma. The strong influence of metal vapors on the ionization-drift characteristics of electrons in a gas was established by simulating the electron kinetics by the Monte-Carlo method. The velocity distribution function of the ions and the angular dependence of the ions bombarding the surface are investigated.
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