Equilibrium and non-equilibrium gas discharges sustained by powerful radiation of the terahertz frequency range in noble gases
Sidorov A. V. 1, Veselov A. P.1, Vodopyanov A. V. 1, Glyavin M. Yu. 1, Kalynov Yu. K.1, Luchinin A. G.1
1Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: alexsv@ipfran.ru, veselov@ipfran.ru, avod@ipfran.ru, glyavin@ipfran.ru, kalynov@ipfran.ru, agl@ipfran.ru

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The results of a study of the spatial dynamics of a discharge in pure noble gases and their mixtures (helium with the addition of argon) in a wide range of gas pressures (0.2-1.5 bar) are presented. The studies were carried out for several frequencies of heating radiation (250, 263 GHz and 1 THz) in a wide range of power densities in the focal spot (from fractions of a kW/cm2 to several MW/cm2). At relatively low power densities, the discharge propagation had an equilibrium character, while at high power densities it was nonequilibrium. Various mechanisms of propagation of nonequilibrium and equilibrium discharges are discussed. Keywords: Terahertz radiation, gas discharge, discharge propagation.
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