Behavior of plasma sheath with nonextensively distributed two-temperature electrons and isothermal ions

Borgohain, Dima Rani; Saharia, K.; Goswami, K. S.

doi:10.1063/1.4972072

Cited by 26 publications

(21 citation statements)

References 46 publications

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“…A homogeneous, unmagnetized three‐component plasma is considered, which consists of cold inertial fluid ions, hot nonextensive electrons, and cool Maxwellian electrons. Under Tsallis nonextensive formalism, the velocity distribution function in one dimension is expressed by

f_{e} ((), v) = C_{q} {\{1 - \{q - 1\} [\frac{m_{e} v^{2}}{2 T_{normale}} - \frac{italiceϕ}{T_{e}}]\}}^{\frac{1}{q - 1}},

where q represents strength of nonextensivity. m e , e , T e , and v are mass, magnitude of charge, temperature, and thermal velocity of electrons, respectively.…”

Section: Theoretical Model and Basic Equationsmentioning

confidence: 99%

“…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%

“…Particle distributions in space plasmas are often observed to be deviated from Maxwellian distribution. [19][20][21] Spacecraft missions [22][23][24] have already confirmed the presence of excess energetic particles, resulting in enhanced high-energy tails in the distributions. Among some of the popular nonthermal distributions that are found in the literature, Kappa distribution is the oldest one, initiated by Vasyliunas [25] in 1968, followed by Cairn's distribution [26] and recently, the Tsallis q-nonextensive distributions.…”

Section: Introductionmentioning

confidence: 99%

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

Kakoti

Saharia

2020

Contributions to Plasma Physics

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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.

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f_{e} ((), v) = C_{q} {\{1 - \{q - 1\} [\frac{m_{e} v^{2}}{2 T_{normale}} - \frac{italiceϕ}{T_{e}}]\}}^{\frac{1}{q - 1}},

where q represents strength of nonextensivity. m e , e , T e , and v are mass, magnitude of charge, temperature, and thermal velocity of electrons, respectively.…”

Section: Theoretical Model and Basic Equationsmentioning

confidence: 99%

“…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%

Section: Introductionmentioning

confidence: 99%

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

Kakoti

Saharia

2020

Contributions to Plasma Physics

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“…Usually, the q-distribution has been considered equal to the κ-distributions in the space plasmas [19,22,[24][25][26][27][28][29][30][31].…”

Section: -----------------------------------------mentioning

confidence: 99%

The nonextensive parameter for the rotating astrophysical systems with power-law distributions

2016

EPL

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We study the nonextensive parameter for the rotating astrophysical systems with power-law distributions, including both the rotating self-gravitating system and the rotating space plasma. We extend the equation of nonextensive parameter to complex system with arbitrary force field F(r,v)=F (r)+α v×F (r), 1 2 and derive a general equation of the q-parameter, most generally including both the rotating self-gravitating systems and the rotating space plasmas. At the same time, we reproduce the κ-distribution in space plasmas and obtain equations of the κ-parameter.We show that the q-parameter is related not only to the temperature gradient, the gravitational force and the electromagnetic force, but also to the inertial centrifugal force and Coriolis force. Thus the rotation introduces significant effect on nonextensivity in the systems. Several examples are given to illustrate the nonextensive effect introduced by the rotation.

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“…[47][48][49][50][51] For example, Hatami [49] 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 [52][53][54] in the electronegative plasma [55] 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.…”

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confidence: 99%

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

Ghani

Driouch

Chatei

2019

Contributions to Plasma Physics

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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.

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Behavior of plasma sheath with nonextensively distributed two-temperature electrons and isothermal ions

Cited by 26 publications

References 46 publications

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

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

The nonextensive parameter for the rotating astrophysical systems with power-law distributions

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

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