RADIATION OF ELECTRONEGATIVE GLOW DISCHARGE AFTER TRANSITION FROM THE CYLINDRICAL GEOMETRY TO THE COAXIAL ONE

Abstract

The transition from traditional cylindrical discharge geometry to the coaxial one (where the discharge plasma is located in a gap between two coaxially placed cylindrical tubes) has been theoretically investigated for positive column of electronegative middle pressure glow discharge in the mixture of chlorine and inert gases. Here a new mechanism of electron losses appears – the diffusional elimination onto the inner wall. It is shown that discharge existence is only possible by sufficient increasing of the ionization rate and hence the electron temperature as well; the last will cause growth of the specific power of discharge ultraviolet radiation. The analytical expressions for estimations of electron temperature of said discharge plasma in coaxial geometry are derived.

Keywords

• plasma radiation
• electronegative discharge
• electron temperature
• ionization frequency
• coaxial geometry