| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Numerical Examination of the Effects of Ion Thermal Flow on Plasma Sheath Characteristics |
| Mansour Khoramabadi1, S. Farhad Masoudi2* |
1Department of Physics, Boroujerd Branch, Islamic Azad University, P. O. Box 518, Boroujerd, Iran
2Department of Physics, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran
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| Cite this article: |
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Mansour Khoramabadi, S. Farhad Masoudi 2013 Chin. Phys. Lett. 30 085202 |
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Abstract The effects of ion thermal flow on the electric and hydrodynamic characteristics of a plasma sheath are examined using a multi-fluid model. In comparison with cold plasma, ion pressure is modeled by a power law dependence on the ion density in warm plasma. The pressure force on the ion depends on the ion density, ion temperature, and a nearly constant parameter called the ion polytropic coefficient. Two well-known quantities for this coefficient, γi =1 and 3, are considered, corresponding to isothermal and adiabatic flows, respectively. The numerical calculations show that increasing the ion temperature decreases the sheath thickness and increases the ion impact energy and ion saturation current at the wall. The ion polytropic coefficient has the same effect as the ion temperature and intensifies the ion temperature effects.
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Received: 11 March 2013
Published: 21 November 2013
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| PACS: |
52.40.Kh
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(Plasma sheaths)
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52.30.Ex
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(Two-fluid and multi-fluid plasmas)
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52.50.Sw
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(Plasma heating by microwaves; ECR, LH, collisional heating)
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