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

Sharma, Gainda L.; Paul, Rupali; Deka, K.; Moulick, R.; Adhikari, S.; Kausik, S. S.; Saikia, B. K.

doi:10.1002/ctpp.202300020

Cited by 2 publications

(3 citation statements)

References 39 publications

(47 reference statements)

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“…On the other hand, the dust charge number increases with the increase in the q h value for a fixed q c = 0.9 as observed in figure 9(b). In the case of the sheath study, the q c values play an important role in influencing the sheath parameters such as sheath electric field, space charge, and many more, as compared to the changes in the q h values [35]. However, the present study shows an alternative behaviour.…”

Section: Role Of Non-extensivity Parametermentioning

confidence: 62%

Charge fluctuations on the dust grains in the presence of energetic electrons

Paul,

Sharma,

Deka

et al. 2024

Phys. Scr.

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Dust charging is an arbitrary process occurring at random times which results in fluctuations of dust charge around its equilibrium value. To have a better insight into the mechanism of charge fluctuations, a numerical simulation of the statistical nature of the dust charging process is investigated. Here, a multicomponent non-Maxwellian hydrogen plasma comprising two electron groups, positive ions, and dust grains is modelled. An increase in the overall negative dust charge number is reported in the presence of non-Maxwellian electrons. Additionally, the study emphasizes the role of electron distribution and hot electron temperature and density on the charge fluctuations of the dust grains.

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Section: Role Of Non-extensivity Parametermentioning

confidence: 62%

Charge fluctuations on the dust grains in the presence of energetic electrons

Paul,

Sharma,

Deka

et al. 2024

Phys. Scr.

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“…Equation (41) shows that the ion drag force depends on ion flow velocity (v i ), the thermal velocity of ions, the screening length of the dust particle, and the magnitude of the dust charge.…”

Section: Dust-charging Modelmentioning

confidence: 99%

“…They assumed that the plasma electrons obey the Boltzmann relation, whereas the dynamics of emitted electrons is modelled by using fluid equations (momentum and continuity). In recent years, there have been many works devoted to the understanding of sheath formation in front of the electron-emitting surface, but it is still not well understood [29,30,[37][38][39][40][41]. There are several previous works that have explored the sheath characteristics by considering the half-Maxwellian distribution of emitted electrons from the surface.…”

Section: Introductionmentioning

confidence: 99%

Ion flow and dust charging at the sheath boundary in dusty plasma with an electron-emitting surface: applications to laboratory and lunar dusty plasmas

Basnet,

Patel,

Bikram Thapa

et al. 2024

Plasma Phys. Control. Fusion

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In laboratory and space plasmas, the emission of electrons from the surface significantly affects the characteristics of plasma sheath formed at that surface, which is crucial to understanding the overall plasma-wall interaction mechanism. In this work, the collisional fluid model is used for laboratory dusty plasma, whereas collisionless model is used for lunar dusty plasma. We have extended the Bohm sheath criterion for the formation of stable plasma sheath in account of electron emission from the surface, loss of ion flux, and gas pressure for the collisional laboratory dusty plasmas. It is found that ion flow at the sheath boundary is considerably influenced by the concentration of electron emission, ion loss term, and gas pressure. The evolution of dust charge explicitly determines the magnitude of ion flow at the sheath boundary. The plasma parameters adopted in the present case are reliable in laboratory and space dusty plasmas, especially dusty plasma environment on the lunar surface. The lunar surface and dust grains on the Moon become electrically charged as a result of the interaction between solar-wind plasma and photoemission electrons emitted from the lunar surface. In addition, the lunar plasma sheath characteristics, dust charging process, and stable dust levitation on the sheath region have been studied.

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

Cited by 2 publications

References 39 publications

Charge fluctuations on the dust grains in the presence of energetic electrons

Charge fluctuations on the dust grains in the presence of energetic electrons

Ion flow and dust charging at the sheath boundary in dusty plasma with an electron-emitting surface: applications to laboratory and lunar dusty plasmas

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