Numerical investigation of secondary electron emission effect on the dusty plasma sheath with superextensive electrons

Abstract

We have investigated the structure of a magnetized sheath of dusty plasma in the presence of secondary electrons emitted by the micro-size dust particles in the context of the Tsallis statistics. The fluid model is used to analyze numerically the effects of the nonextensivity parameter q on the emission of secondary electrons and therefore, on the sheath structure as well as the dust dynamics. The results show that the secondary emission yield increases with the decrease of the parameter of nonextensivity q and consequently, the dust charge becomes less negative with its range of values playing a primordial role in the secondary electron emission rate. The quantities characterizing the sheath are significantly affected by the secondary electron emission (SEE) from the dust. It is seen that as the SEE rises at a given value of q(q<0.91), the sheath potential decreases as well as its absolute value at the wall. In addition, the dynamics of the dust particles is also affected by the emission of secondary electrons.

Secondary electron emission impact on the tungsten dust particle in a plasma with super‐extensive electrons

“…The collection of the electron current, I e , for the q-distribution is given as. [6,9] I e = −en e 𝜋r…”

“…$$ [ 14 ] Since the SEE including the BEE, IRE and TEE plays an important role on the dust particle potential and then modifies the dust particle lifetime, it is necessary to investigate the impact of SEE on the dust particle in a plasma with super‐extensive electrons, because the presence of the super‐extensive electrons can have enough energy and then eject the secondary electrons from a dust particle producing a SEE current. [ 9 ]…”

“…The plasma distribution can be followed well by power‐law distributions in some conditions, and the typical forms of the power‐law distributions including the $$$ \upkappa $$$‐distributions and the q‐distributions have been used to investigate the dust particle in both the bulk plasma and sheath plasma in recent years. [ 5–12 ] It is found that with the increasing $$$ \upkappa $$$‐parameter or decreasing q‐parameter, the dust particle potential decreases.…”

“…[14] Since the SEE including the BEE, IRE and TEE plays an important role on the dust particle potential and then modifies the dust particle lifetime, it is necessary to investigate the impact of SEE on the dust particle in a plasma with super-extensive electrons, because the presence of the super-extensive electrons can have enough energy and then eject the secondary electrons from a dust particle producing a SEE current. [9] In this paper, we examine the dust particle potential modified by the emission of secondary electrons from the dust particle in a plasma with super-extensive electrons, and then investigate the evolution of the dust particle temperature in the dust particle heating process. For that, we consider W dust particle in deuterium plasma with energy range 10 eV < T e < 30 eV, and the SEE including BEE, IRE and TEE is calculated based on the model developed by Furman and Pivi (F-P model).…”

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

“…Their study shows that the critical SSE coefficient ($$$ {\gamma}_c $$$) increases for the super‐extensive distribution of electrons ($$$ q<1 $$$) while it decreases for the sub‐extensive electron distribution ($$$ q>1 $$$). Ghani et al [ 32 ] investigated the effect of SEE on a dusty plasma sheath and reported that the secondary emission yield increases with the decrease in $$$ q $$$ and consequently observed a reduction in the dust charge. Exploring such problems by incorporating collisional effects will bring new insight to the problem.…”