LAUSR

In this paper, a plasma sheath containing primary electrons, cold positive ions, and secondary electrons is studied using a one‐dimensional fluid model in which the primary electrons are described by q‐non‐extensive distribution according to the Tsallis statistics. Based on the Sagdeev potential method and the current balance relation, a modified sheath criterion, and floating potential are established theoretically. The effect of secondary electron emission on q‐non‐extensive plasma sheath characteristics have been numerically examined. A significant change is observed in the quantities characterizing the non‐extensive plasma sheath with the presence of the secondary electrons. It is found that the sheath properties with super‐extensive distribution (q<1) and sub‐extensive distribution (q>1) are different compared with plasma sheath with Maxwell distribution (q=1) .