Study of two-electron temperature plasma sheath using nonextensive electron distribution in presence of an external magnetic field

TL;DR

This paper investigates the formation of plasma sheaths in a two-electron temperature plasma with nonextensive electron distributions under an external magnetic field, revealing how magnetic inclination and collisional effects influence sheath properties.

Contribution

It introduces a comparative analysis of electron distribution models and explores sheath behavior considering nonextensive distributions and magnetic field effects in collisional plasma regimes.

Findings

Electron distribution deviates from Boltzmann distribution near parallel magnetic fields.

Collision effects enhance flux deposition in highly magnetized conditions.

Sheath properties are significantly affected by nonextensive parameter and magnetic inclination.

Abstract

In this study, the physics of sheath formation in a collisional two-electron temperature plasma in the presence of an oblique external magnetic field has been investigated. At first, a comparative study among the fluid electron model, Boltzmann electron model and the nonextensive electron model has been carried out and a suitable range of nonextensive parameter q has been predicted. In the latter part, a collisional two-electron temperature plasma is considered. Both the hot and cold electron densities are described using the non-extensive distribution whereas cold ions are described by the fluid equations. The properties of the sheath are investigated in different collisional regimes by varying the non-extensive parameter (q) and the hot to cold electron densities and temperatures. The magnetic field inclination angle is varied in the limit $1^0 \leq \alpha \leq 5^0$. It is observed that electron distribution significantly deviates from Boltzmann distribution for nearly parallel magnetic field. Moreover, collision enhanced flux deposition for highly magnetised case is a significant finding of the study. The results obtained in this study can enhance the understanding of plasma matter interaction processes where multiple electron groups with near parallel magnetic field are found.