Modeling of the DBD in Xe-Cl$_{2}$ mixtures: effect of chlorine concentration and pressure

Characteristics of the DBD in Xe-Cl$_{2}$ mixtures were simulated using the 1D fluid model at gas pressure 150-300 Tor and chlorine concentration in the mixtures 0.1- 5{\%}. The discharge gap is fixed at 4 mm. Two dielectric layers have an identical thickness 2 mm and relative permittivity 4. The source voltage $U_{S}=U_{0}$\textit{sin$\omega $t} with $f$=100 kHz and $U_{0}$=4.25 or 5 kV is applied to the electrodes. Simulations show at all chlorine concentrations in the Xe-Cl$_{2}$ mixtures the most abundant negative species in the discharge are Cl$^{-}$ ions, the most abundant positive ions are Xe$_{2}^{+}$. At the current pulse densities of electrons and Xe$^{+}$ ions near the dielectric barrier sharply increases. The potential drop across the discharge gap increases and the magnitude of the current pulse falls with chlorine content in the mixture. Power deposited into heating of positive and negative ions grows with chlorine concentration; power deposited into electrons mainly decreases with chlorine concentration. Growth of the chlorine content in Xe-Cl$_{2}$ mixtures results in increase of electron energy expenses on Cl$_{2}$ dissociation, Xe and Cl$_{2}$ ionization, and Cl$_{2}^{\ast }$ and Xe$^{\ast \ast }$ excitation. At chlorine concentration higher than 0.1{\%} emission of the XeCl$^{\ast}$ 308 nm band predominates in radiation flux. The DBD radiative efficiency decreases with pressure and has maximum at small chlorine concentration.