Secondary electron emission and collisional effects in a two-electron temperature plasma sheath

The effects of secondary electron emission from the surface of a material that is in direct contact with a plasma containing two different electron groups have been investigated based on the hydro-dynamic sheath model. The two-electron groups present in the system have distinct densities and temperatures. They are described by the non-extensive distribution function, whereas cold ions are assumed to be fluid elements. In addition, the effect of ion-neutral collision has also been taken into account. The study reveals that the electron non-extensivity has a significant effect on the secondary electron population as well as space charge deposition near the wall. The results obtained from the study will provide a better understanding of the plasma-wall transition region under an electron-emitting condition.