Investigation of multi-component magnetized plasma interaction with the carbon surface

The proper understanding of magnetized plasma wall-interaction is important in various plasma applications such as surface modifications, sputtering and etching. A multi-component plasma interacting with carbon surface in presence of an oblique magnetic field has been investigated using three-fluids model. In the present case, the plasma is assumed to consist of two species of positive ions (H+ and He+) and electrons. The governing equations are solved numerically for given initial and boundary conditions. The results show that the magnitude of sheath potential increases with the increase in electron temperature and it affects velocity of both ion species, which is crucial in the understanding of plasma wall-transition mechanism. The reflection coefficients of lighter and heavier ions for the carbon surface decrease with the increase in ion velocity and in reduced energy; however the lighter ions are reflected more than the heavier ions. Hence, the absorption coefficients of both the ions increase for the increase in ion velocity and reduced energy as well. Furthermore, the reflection coefficient of hydrogen ions is about 20% more in magnitude than that of helium ions for the carbon surface.