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1 Transactions of the Institute of Fluid-Flow Machinery

1 2003

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Plasma parameters in a surface wave discharge in nitrogen at atmospheric pressure

Nowakowska H., Stańco J., Zakrzewski Z.

Transactions of the Institute of Fluid-Flow Machinery

2003

nr 112

125-137

Spatial distributions of plasma parameters are calculated for a surface wave discharge sustained in nitrogen at atmospheric pressure. A macroscopic model, applicable to an axially uniform two-temperature plasma, yields the radial distributions of the parameters. The axial distributions are determinated from relations based on the approximation of local axial uniformity, which is valid provided the attenuation of the surface wave is weak. In the approximation adopted, the plasma parameters in any cross section of the discharge depend under given conditions solely on L, the power lost per unit length of the plasma column. Calculations made for a 2.45 GHz discharge in a capillary tube show an almost linear decrease of L and of the electron density towards the end of the discharge. The electron temperature for nitrogen is lower than for argon under similar discharge conditions. In nitrogen the electron density is about one order of magnitude lower and the gas temperature is much closer to the electron temperature than for argon. This may be explained by the presence of vibrational and rotational excitation and relaxation channels, which facilitate redistribution of the energy deposited in the discharge.