Dusty plasma induced by solar radiation under microgravitational conditions: An experiment on board the Mir orbiting space station

Фортов, В. Е.; Nefedov, A. P.; Ваулина, О. С.; Lipaev, A. M.; Molotkov, V. I.; Samaryan, A. A.; Nikitskii, V. P.; Ivanov, Alexander; Savin, S. F.; Kalmykov, A. V.; Solov’ev, A. Ya.; Vinogradov, P. V.

doi:10.1134/1.558598

Cited by 193 publications

(86 citation statements)

References 17 publications

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“…In low temperature plasmas the thermionic emission of electrons can lead to positive particle charges [56]. For complex (dusty) plasmas in space the photoelectric emission of electrons due to fluxes of photons to the particle surface plays an important role [89], as does the secondary electron emission caused by incident primary electrons with energies above a material dependent threshold [90]. In the plasma regime of a typical RF-discharge, as used for the experiments presented later, the contribution to the charge by the emission processes can be neglected.…”

Section: Particle Charge and Interactionmentioning

confidence: 99%

Phase Transitions in Two-Dimensional Complex Plasmas

Knapek¹

2011

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Section: Particle Charge and Interactionmentioning

confidence: 99%

Phase Transitions in Two-Dimensional Complex Plasmas

Knapek¹

2011

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“…There are three principal mechanisms by which a dust grain becomes positively charged (Fortov et al 1998). These are (i) photoemission in the presence of a flux of ultraviolet (UV) photons, (ii) thermionic emission induced by radiative heating, and (iii) secondary emission of electrons from the surface of the dust grains.…”

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Shock waves in a dusty plasma with dust of opposite polarities

Rahman

Mamun

Alam

2008

Astrophys Space Sci

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A four-component dusty plasma consisting of electrons, ions, and negative as well as positive dust particles has been considered. The basic features of shock waves that may exist in such a four-component dusty plasma have been theoretically investigated by the reductive perturbation method. The implications of our results in different regions of space (viz. cometary tails, mesosphere, Jupiter's magnetosphere, etc.) are briefly discussed.

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“…[9,10]. Experiments showing the formation of ordered structures with positively charged dust are reported in laboratory [11,12] and in microgravity [13]. Since charging is governed by the characteristic length of the body relative to the plasma Debye length or the electron gyroradius, there is no conceptual difference between the examples above and in what follows we will use the term dust broadly.…”

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Charging and Heat Collection by a Positively Charged Dust Grain in a Plasma

Delzanno

Tang

2014

Phys. Rev. Lett.

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Dust particulates immersed in a quasineutral plasma can emit electrons in several important applications. Once electron emission becomes strong enough, the dust enters the positively charged regime where the conventional Orbital-Motion-Limited (OML) theory can break down due to potential well effects on trapped electrons. A minimal modification of the trapped-passing boundary approximation in the so-called OML + approach is shown to accurately predict the dust charge and heat collection flux for a wide range of dust size and temperature.PACS numbers: 52.25. Dg, 52.27.Lw, The problem of the charging of a solid body in a plasma has a long history and various applications ranging from probes and spacecraft to planet formation to dusty plasmas in laboratory and space [1]. The body collects plasma particles and is often negatively charged owing to the higher electron mobility. In many instances, however, the body can emit electrons (via thermionic emission, photoemission and secondary electron emission) and become positively charged. [9,10]. Experiments showing the formation of ordered structures with positively charged dust are reported in laboratory [11,12] and in microgravity [13]. Since charging is governed by the characteristic length of the body relative to the plasma Debye length or the electron gyroradius, there is no conceptual difference between the examples above and in what follows we will use the term dust broadly.A charging theory is a necessary ingredient of any model of dust transport and destruction/survival in a plasma [4,6,7,9,[14][15][16][17][18][19]. It calculates the dust charge/potential, momentum and heat collection due to the dust-plasma interaction. The most widely used charging theory is the Orbital-Motion-Limited (OML) theory [20], which leads to a simple nonlinear equation for the dust potential.In this Letter, we use PIC simulations and theoretical analysis to show that OML can become inapplicable in the positively charged regime. It can completely miss the transition between negatively and positively charged dust (thus predicting a positive dust potential when simulations show a negative dust potential) and overestimates the power collected by the grain (up to a factor of 2 for the cases considered). This is due to the development of a non-monotonic potential (a potential well) near the grain. The fact that a potential well can exist near an electron emitting body is known [3,21,22]. However, this is the first study that illustrates the breakdown of OML in this regime. Moreover, this Letter presents a revised charging theory which is as simple as OML, recovers OML in the appropriate limits, but remains accurate when potential well effects are important.We study the charging of a spherical dust grain of radius r d at rest in a collisionless, unmagnetized hydrogen plasma (m e (i) and T e (i) are the electron (ion) mass and temperature, n 0 is the unperturbed plasma density away from the grain). The dust grain charges by collecting plasma and emitting electrons. The dynamics of the system...

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Dusty plasma induced by solar radiation under microgravitational conditions: An experiment on board the Mir orbiting space station

Cited by 193 publications

References 17 publications

Phase Transitions in Two-Dimensional Complex Plasmas

Phase Transitions in Two-Dimensional Complex Plasmas

Shock waves in a dusty plasma with dust of opposite polarities

Charging and Heat Collection by a Positively Charged Dust Grain in a Plasma

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