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Helium flowing positive column plasmas

A helium gas flowing positive column plasma has been studied theoretically and experimentally. Coupled transport equations for electrons, metastable species, atomic and molecular ions have been solved numerically, and axial and radial species density profiles have been calculated for a steady state cylindrical discharge tube under laminar gas flow. Experimental confirmation has been conducted by measuring the plasma parameter profiles using an electrostatic probe, and results agree well with the present model.