Characteristics of Electronegative Plasma Sheath with q-Nonextensive Electron Distribution

Numerical study of the effect of secondary electron emission on the sheath characteristics in q‐non‐extensive plasma

“…The electric potential along the sheath for different values of 𝛾 at u sw = 40 (a) the super-extensive distribution (q = 0.8), (b) the Maxwellian distribution (q = 1), and (c) the sub-extensive distribution (q = 1.2) the sheath edge as 𝜓 ′ (𝜉 = L) = E 0 = 0.1. This assumption enables us to compare our results, for example, with those of Borgohain et al [31] in the case of non-extensive plasma sheath without SEE. To investigate the sheath properties of a plasma consisting of singly charged cold positive ions Ar + , q-non-extensive electrons, and secondary electrons, we have analysed the distribution profiles of the main characteristics of the plasma sheath such as the electric potential, the secondary electron density, and the charge space density.…”

“…In the last decade, the study of non-extensivity in plasmas and plasma sheaths has attracted significant attention. [30][31][32][33][34] Assuming a non-extensively distributed population of electrons, Debye shielding, floating potential, and sheath thickness in a two component collisionless unmagnetized plasma sheath with cold ions, has been studied by Sharifian et al [30] Borgohain et al [31,32] have studied the behaviour of the sheath in an electronegative plasma with q-non-extensive electron distribution. The sheath structure in the presence of non-extensive electrons for a constant and variable dust charge have been respectively studied by Driouch et al [33] and El Ghani et al [34] Given the assumption that a super-extensive statistical distribution describes the highly energetic population of electrons, it is straightforward to think that such a population of electrons is more likely to produce secondary electrons emission from the wall, in the sheath region, and hence, a SEE process must be included in a sheath model for a complete study.…”

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

“…A good number of studies have been carried out to explore sheath physics by assuming non‐extensive electron distribution. [ 25–30 ] These studies have reported that deviation of electron distribution from the Boltzmannian nature leads to variations in the space charge deposition near the wall. Moreover, expansion of the sheath has also been observed for lower values of $$$ q $$$.…”

Numerical study of an electrostatic plasma sheath with non‐thermal electrons and charged nanoparticles

“…The investigation of plasma sheath is of great importance due to its application in different areas such as plasma probes, low-temperature plasma-aided material processing, as well as fusion research. [21][22][23][24][25][26][27] For example, Driouch and Chatei investigated a magnetized dusty plasma sheath in the presence of a q-non-extensive distribution of electrons. [4][5][6][7][8] Since the forces acting on the dust particles and charging processes are important in characterization of the plasma sheath, numerous research studies investigated these effects and it was found that the presence of dust nanoparticles modifies the structure of the plasma sheath.…”

“…A large number of authors have used q-non-extensive velocity distribution to investigate the effects of non-thermal electrons on the plasma sheath dynamics. [21][22][23][24][25][26][27] For example, Driouch and Chatei investigated a magnetized dusty plasma sheath in the presence of a q-non-extensive distribution of electrons. [23] They assumed that the dust charge is constant.…”