Magnetized plasma sheath properties in the presence of Maxwellian low-temperature and non-Maxwellian high-temperature electrons

Abstract

The characteristics of a magnetized plasma sheath in the presence of two-groups of electrons, namely, low-temperature electrons (LTEs) and high-temperature electrons (HTEs), have been studied using the fluid model. The LTEs are considered to obey the Boltzmann distribution, whereas the HTEs follow the so-called q-nonextensive distribution. The Bohm-sheath criterion which gets modified is developed for such plasmas, and the compiled fluid equations are solved numerically. The obtained results signify that the q-nonextensive parameter and concentration ratio have a significant effect on the magnetized plasma sheath parameters. The magnitude of sheath potential monotonically increases toward the wall consistent with Debye shielding. The temperature ratio of HTE to LTE also affects the electrostatic sheath potential. Although the q-parameter and concentration ratio affect the electron and ion density profiles as both decrease toward the wall, the electron density decreases much faster than ions. In addition, the LTE density decreases at the sheath entrance, whereas the HTE density increases for the increasing concentration ratio.