Magnetized plasma sheath with two species of positive ions

Hatami, M. M.; Niknam, A. R.; Shokri, B.; Ghomi, H.
May 2008
Physics of Plasmas;May2008, Vol. 15 Issue 5, p053508
Academic Journal
The effects of the magnitude and direction of an oblique magnetic field and the effect of the ion densities ratio on a plasma sheath of electrons and two species of positive ions are investigated by using a three-fluid hydrodynamics model. These ions have different masses but the same ionization ratio (Z=1). It is shown that the density distribution and velocity of the lighter and heavier ion species begin to fluctuate under the action of the electrostatic and Lorentz forces when the ratio of electron Debye length to lighter ion species Larmor radius becomes greater than 1 and 3, respectively. Also, it is found that the velocity fluctuations of the lighter ion species are much higher than those of the heavier ion species. Furthermore, the obtained results due to the presence of the second ion (the heavier ion) are compared to the reported results of the magnetized plasma sheath including single positive ion species. In the presence of the second ion, it is shown that the velocity and density distribution of the lighter ion species in the magnetized plasma sheath decreases and increases, respectively.


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