Charging properties of a dust grain in collisional plasmas

Khrapak, S. A.; Morfill, G. E.; Khrapak, A. G.; D’yachkov, L. G.

doi:10.1063/1.2201538

Cited by 79 publications

(59 citation statements)

References 35 publications

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“…21 For further analysis, it is convenient to introduce the following normalized units: the dimensionless grain charge z = ͉Q ͉ e / aT e , the electron-to-ion temperature ratio = T e / T i , the thermal Mach number for drifting ions M T = u / v T i , normalized ion mean-free path = ᐉ i / D , and the so-called scattering parameter 35,36 ␤ = z͑a / D ͒. Furthermore, let us use a well-known asymptotic expression for the ion flux on a infinitesimally small grain ͑a D ͒ in the continuum limit ͑ᐉ i a͒, which can be written as 17,20,37 …”

Section: Resultsmentioning

confidence: 99%

“…In isotropic collisional plasmas, the elctrostatic potential around an absorbing body in the absence of ionization/recombination processes in its vicinity has an even more slowly decaying ϰr −1 long-range asymptote. [17][18][19][20][21] However, complex plasmas are very often subject to self-consistent large-scale electric fields that induce plasma fluxes relative to the ͑often stationary͒ grain component. These flows, in addition to a direct dragging influence, are also responsible for the generation of collective plasma processes such as wake formation downstream from the grains, which strongly modify the electrostatic interaction compared to the isotropic case.…”

Section: Introductionmentioning

confidence: 99%

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Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption

2007

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The electric field and potential behind a small absorbing body (dust grain) at floating potential has been calculated analytically in a highly collisional drifting plasma. Linear plasma response formalism has been used and main attention has been focused on the effect of plasma absorption on the grain. It is shown that the long-range asymptote of the electric field is dominated by the effect of absorption and is always negative. Depending on plasma parameters, the electric field at intermediate distances can either increase monotonically or exhibit one maximum and one minimum. It can achieve positive values in certain parameter regimes, which indicates the possibility of electrostatic attraction between the grains aligned parallel to the flow. The obtained results can be important for understanding of the binary grain interactions in complex plasmas at elevated pressures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption

2007

Self Cite

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“…This is borne out by new theoretical analyses of the charging mechanism of the dust particles -in particular the role of ion flows in these systems. Recent theoretical works by Lampe and co-workers, [113], [114], [115] Khrapak and co-workers, [104], [116], [117] and Hutchinson and co-workers, [118], [119], [120] have been part of a concentrated effort to provide new insights that will drive the next generation of experimental studies.…”

Section: Microparticle Chargingmentioning

confidence: 97%

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Thomas¹

2009

Contrib. Plasma Phys.

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The study of dusty plasmas in dc‐generated plasmas is a broad topic because of the wide variety of experimental configurations that fall under the category of “dc plasma source”. Experimental configurations such as the hot filament discharge, anodic (anode/cathode) discharge, and Q‐machine are all variations of the “dc plasma source” in which extensive studies of dusty plasmas have been performed. This paper will review dusty plasma investigations in these plasma sources. First, an introduction to each of these configurations and representative examples of each one will be given. This will be followed by a discussion of microparticle confinement in each of these configurations. Then, key results from dusty plasma investigations using these devices will be discussed. Specific emphasis will be placed on studies of: microparticle charging, particle cloud morphology, dust‐driven and dust‐modified waves, and strongly coupled effects. Some remarks on emerging research areas will be given at the end (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…To our knowledge little specific work on the KE regime is available, and the reader is referred to Ref. [19] for some preliminary considerations.…”

Section: Previous Approaches To the "Dust" Problemmentioning

confidence: 99%

Continuum-plasma solution surrounding nonemitting spherical bodies

Patacchini

Hutchinson

2009

Physics of Plasmas

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The classical problem of the interaction of a non-emitting spherical body with a zero meanfree-path continuum plasma is solved numerically in the full range of physically allowed free parameters (electron Debye length to body radius ratio, ion to electron temperature ratio, and body bias), and analytically in rigorously defined asymptotic regimes (weak and strong bias, weak and strong shielding, thin and thick sheath). Results include current-voltage characteristics as well as floating potential and capacitance, for both continuum and collisionless electrons. Our numerical computations show that for most combinations of physical parameters, there exists a closest asymptotic regime whose analytic solutions are accurate to 15% or better.

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Charging properties of a dust grain in collisional plasmas

Cited by 79 publications

References 35 publications

Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption

Electrostatic potential behind a macroparticle in a drifting collisional plasma: Effect of plasma absorption

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Continuum-plasma solution surrounding nonemitting spherical bodies

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