In this paper, we focused on the identification of the normal and abnormal glow discharge modes in a neon-xenon gas mixture at low pressure. We considered four gas mixtures: 90%Ne-10%Xe, 80%Ne-20%Xe, 70%Ne-30%Xe and 50%Ne-50%Xe at 1.5 Torr. The range of the gap voltage is 150-500 V. A one-dimensional fluid model with multiple species was used in this work, and the metastable state of the atoms as well as the radiation effects were integrated into the model too. The input data changed for each percentage in the gas mixture, and was calculated by BOLSIG+ software. The parameters of particle transport and their rate coefficients strictly depend on the mean electron energy. The results show that the neon ion density is negligible compared to the xenon ion density, mostly in the case of 50%Ne-50%Xe.
In this work, the current-voltage characteristics in a 90%helium-10%argon gas mixture glow discharge at low pressure have been studied. Three pressures values are considered 1.5, 2, and 2.5 Torr. The range of voltage is between 150 and 500 V. The model of our system is a fluid of two ordered components, in which the metastable state of the atoms and the radiation effects are included. The parameters of particle transport and their rate coefficients strictly depend on mean electron energy, and they are calculated by using the BOLSIG+ software. The range of the mean electron energy is taken between 0.04 and 133 eV, and the electron energy distribution function is taken in non-Maxwellian form. The results show that the argon ion density is more important than the helium ion density, despite the presence of more constant background helium gas density in the mixture. The normal and abnormal glow discharge modes appear on the electric characteristics. The obtained results are compared to both experimental data and numerical results which exist in the literature.
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