Influence of ionization on sheath structure in electropositive warm plasma carrying two-temperature electrons with non-extensive distribution
Rajat Dhawan, Mayank Kumar, Hitendra K. Malik
Abstract
A collisional electropositive plasma having two-temperature (hot and cold) electrons with non-extensive distribution and warm ions is investigated for the sheath structure by taking into account the ionization in plasma. A modified Bohm's sheath criterion is realized in such a plasma, which shows considerable dependence on the non-extensive parameter, collisional parameter, ionization, ion temperature, and concentration and temperature of hot electrons. The corrected choice for the initial value of the electric field at the sheath edge is obtained for a given set of plasma parameters. The sheath thickness and the electric potential in the sheath show significant modification under the effect of non-extensive parameters and temperature and concentration of hot electrons. A noticeable change in the sheath characteristics is also recorded for different ionization rates, collisional parameters, and ion temperatures. A comparative study for the two-temperature electrons having non-extensive distribution with the electrons having Boltzmann distribution and single-temperature electrons having non-extensive distribution is also done in order to uncover the role of two-temperature, i.e., hot and cold electrons.