Behavior of collisional sheath in electronegative plasma with q -nonextensive electron distribution

Self Cite

Ion‐acoustic supersolitons are investigated in an unmagnetized two‐temperature electron plasma comprising cold fluid ions, hot nonextensive electrons, and cool Maxwellian electrons by using the Sagdeev pseudopotential technique. Existence domain of positive polarity supersolitons in terms of Mach number is computed, which is found to exist for Mach numbers beyond the existence of positive double layers. The domain of existence of supersolitons diminishes with the decrease of the nonextensive parameter (q). The amplitude and width of the supersolitons are dependent on the cool‐to‐hot electron temperature ratio (τ), cool electron density (f), and nonextensive parameter (q). The increase of cool electron density increases the amplitude of the supersolitons. For fixed values of f, q, and Mach numbers, the decrease of τ exhibits more distinct wiggles in the electric fields of supersolitons. The present work may be helpful for further study of supersolitons in the auroral plasma.

“…Finally, for our plasma model, the hot q ‐nonextensive electron density is expressed as,

n_{h} = n_{normalh 0} {(1 + (q - 1) \frac{italiceϕ}{T_{normalh}})}^{\frac{q + 1}{2 (q - 1)}},

…”

Section: Theoretical Model and Basic Equationsmentioning

confidence: 99%

“…Finally, for our plasma model, the hot q-nonextensive electron density is expressed as, [20,34,55] n h = n h0…”

Section: Theoretical Model and Basic Equationsmentioning

confidence: 99%

Effect of nonextensivity on the characteristics of supersolitons in a two‐temperature electron plasma

Kakoti

Saharia

2020

Self Cite

“…For example, Hatami studied the sheath formation criterion in a collisional plasma consisting of non‐extensively distributed electrons and thermal ions, and discussed the effect of non‐extensive electrons on the behaviour of the density distribution of charged particles. Furthermore, the sheath in the presence of two‐temperature q ‐non‐extensive electrons in the electronegative plasma was investigated recently and it's shown that the presence of non‐extensive electron strongly modifies the sheath structure. In their model, the investigations are limited to the plasma sheath without dust particles.…”

Section: Introductionmentioning

confidence: 99%

Effects of non‐extensive electrons on the sheath of dusty plasmas with variable dust charge

Ghani

Driouch

Chatei

2019

In this study, a detailed investigation of the problem of sheath is presented using the fluid model in a magnetized three‐component dusty plasma system comprising positive ions, dust grains with variable charge and q‐non‐extensive electrons (i.e., the electrons evolve far away from their Maxwellian thermodynamic equilibrium [q = 1]). The effects of q‐non‐extensivity parameter on the plasma sheath parameters are studied numerically. A significant change is observed in the quantities characterizing the sheath with the presence of the super‐extensive electrons (q < 1) and sub‐extensive electrons (q > 1). In addition, based on the orbital motion limited theory, by taking various forces acting on the dust particle into consideration, the dynamics of the dust located within the sheath, that is, the dust grain charging inside the sheath, is examined under different values of q. It is found that the q‐non‐extensivity has affected significantly the dynamics and the charging process of the dust grains in the sheath.

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Khalilpour

Foroutan

2019

Numerical solutions of the multi-fluid equations are used to investigate the effects of non-thermal electrons on the structure of an electrostatic plasma sheath in the presence of nano-sized dust grains. It is assumed that electrons obey the Cairns distribution [Cairns et al. Geophys. Res. Lett. 22, 2709], with a parameter that determines the effect of non-thermal electrons and shows the deviation from the Maxwellian distribution. The results revealed that sheath parameters are strongly modified in the presence of non-thermal electrons and with increasing the sheath width increases. With the increase in , the absolute dust charge increases while the dust density is reduced. K E Y W O R D Scharged nanoparticles, electrostatic plasma sheath, non-thermal electron distribution