Authors: Mansour Khoramabadi S Farhad Masoudi
Publish Date: 2012/04/21
Volume: 341, Issue: 2, Pages: 501-505
Abstract
Recently it has been shown that for finite and small values of the electron Debye length the ion polytropic coefficient is approached to some constant value in the plasma sheath region by decreasing the plasma density In this paper using a plasma multi fluid model the effect of ion polytropic coefficient γ i on the plasma sheath structure have been examined The numerical calculations of the basic equation of the model show that the polytropic coefficient strongly affects on the plasma sheath characteristics The results show that by transition from an isothermal flow γ i =1 to an adiabatic flow γ i =3 the net current to the wall and the electric potential distribution increase and the sheath width decreases in a thermal plasma sheath
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