Numerical modeling of the dielectric barrier glow discharge in atmospheric-pressure helium with oxygen impurities

Summary form only given, as follows. In this numerical work, a one-dimensional numerical model of the dielectric barrier discharge in a glow mode has been developed for the non-equilibrium helium plasma in atmospheric pressure to resolve the above-mentioned problem. A set of continuity equations of charged particles including electrons, positive ions and metastably-excited species are considered, and an RCIP (Rational Cubic Interpolated Propagation) scheme is employed to solve the equations accurately and minimize the numerical diffusions in their solutions Poisson´s equation coupled with the continuity equations is used for the calculation of electric field. In addition, the electron transport and interaction parameters are calculated from integrals of the electron energy distribution functions (EEDF), which are obtained by using a time-dependent Boltzmann equation solver. A typical one-peak shape of current is appeared in the DBGD operated with an audio-frequency range of applied voltages, and the spatial distributions of density and electric field are plotted which are similar to those obtainable in the low pressure glow discharge. Then, the dependence of plasma stability on the amount of oxygen impurities is discussed on the basis of calculated results.