Effect of negative oxygen ions on the characteristics of plasma in a cylindrical DC discharge
Publish place: Journal of Theoretical and Applied Physics، Vol: 8، Issue: 2
Publish Year: 1393
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JTAP-8-2_003
تاریخ نمایه سازی: 27 مرداد 1397
Abstract:
Langmuir probe measurements are performedin cylindrical dc glow discharge plasma. Plasma wasgenerated in an evacuated glass tube, with circular planedisk electrodes. Measurements were carried out at differentpoints along the axis of tube for different working pressuresof pure argon and mixture of argon–oxygen gasses toobtain the plasma density and temperature as well asplasma and floating potentials. Variation of dischargepotential as a function of discharge pressure for bothplasmas is observed. It is shown that electron temperature,plasma potential, and floating potential in constant currentmode and constant pressure are increased from cathode toanode on the axial points of the discharge tube, whileelectron density is decreased. To sustain the dischargeprocess after adding oxygen to plasma, higher voltage isrequired since electrons are more energetic at lowerdensity.
Keywords:
Glow discharge plasma Langmuir probe Electron density Floating potential Electronegative
Authors
Davoud Dorranian
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mahsa Alizadeh
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran