PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Effects of gas pressure on plasma characteristics in dual frequency argon capacitive glow discharges at low pressure by a self-consistent fluid model |
Lu-Lu Zhao(赵璐璐)1,2, Yue Liu(刘悦)1, Tagra Samir1 |
1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams(Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China; 2. School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, China |
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Abstract A self-consistent fluid model for dual radio frequency argon capacitive glow discharges at low pressure is established. Numerical results are obtained by using a finite difference method to solve the model numerically, and the results are analyzed to study the effect of gas pressure on the plasma characteristics. It shows that when the gas pressure increases from 0.3 Torr (1 Torr=1.33322×102 Pa) to 1.5 Torr, the cycle-averaged plasma density and the ionization rate increase; the cycle-averaged ion current densities and ion energy densities on the electrodes electrode increase; the cycle-averaged electron temperature decreases. Also, the instantaneous electron density in the powered sheath region is presented and discussed. The cycle-averaged electric field has a complex behavior with the increasing of gas pressure, and its changes take place mainly in the two sheath regions. The cycle-averaged electron pressure heating, electron ohmic heating, electron heating, and electron energy loss are all influenced by the gas pressure. Two peaks of the electron heating appear in the sheath regions and the two peaks become larger and move to electrodes as the gas pressure increases.
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Received: 29 June 2017
Revised: 30 August 2017
Accepted manuscript online:
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PACS:
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52.25.Jm
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(Ionization of plasmas)
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52.30.Ex
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(Two-fluid and multi-fluid plasmas)
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52.50.Qt
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(Plasma heating by radio-frequency fields; ICR, ICP, helicons)
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52.65.-y
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(Plasma simulation)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51172101). |
Corresponding Authors:
Yue Liu
E-mail: liuyue@dlut.edu.cn
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Cite this article:
Lu-Lu Zhao(赵璐璐), Yue Liu(刘悦), Tagra Samir Effects of gas pressure on plasma characteristics in dual frequency argon capacitive glow discharges at low pressure by a self-consistent fluid model 2017 Chin. Phys. B 26 125201
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