Particle flows in a dc discharge in laboratory and microgravity conditions

Khrapak, S. A.; Thoma, Markus H.; Chaudhuri, M.; Morfill, G. E.; Zobnin, A. V.; Usachev, A. D.; Petrov, O. F.; Фортов, В. Е.

doi:10.1103/physreve.87.063109

Cited by 36 publications

(31 citation statements)

References 53 publications

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“…Similarly, F (c) (t) gives the probability of the escape of less than c particles from the vicinity of a test particle, in a given direction. The probability of the escape of exactly one particle can thus be calculated as P 1 (t) = F (2)…”

Section: Connection Between the Directional Correlation Functions mentioning

confidence: 99%

“…Systems with this property are rather widespread in nature and appear as well in various laboratory settings [1]. A wide variety of physical phenomena taking place in such a system makes them an attractive subject for investigations [2][3][4]. Strongly coupled plasmas are used in many areas of science and technology that are continuously expanding, and studies are performed by both experimental [5,6] and theoretical methods [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Cage correlation and diffusion in strongly coupled three-dimensional Yukawa systems in magnetic fields

et al. 2016

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The influence of an external homogeneous magnetic field on the quasilocalization of the particles-characterized quantitatively by cage correlation functions-in strongly coupled three-dimensional Yukawa systems is investigated via molecular dynamics computer simulations over a wide domain of the system parameters (coupling and screening strengths, and magnetic field). The caging time is found to be enhanced by the magnetic field B. The anisotropic migration of the particles in the presence of magnetic field is quantified via computing directional correlation functions, which indicate a more significant increase of localization in the direction perpendicular to B, while a moderate increase is also found along the B field lines. Associating the particles' escapes from the cages with jumps of a characteristic length, a connection is found with the diffusion process: the diffusion coefficients derived from the decay time of the directional correlation functions in both the directions perpendicular to and parallel with B are in very good agreement with respective diffusion coefficients values obtained from their usual computation based on the mean-squared displacement of the particles.

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Section: Connection Between the Directional Correlation Functions mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cage correlation and diffusion in strongly coupled three-dimensional Yukawa systems in magnetic fields

et al. 2016

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“…There is some evidence that the dust-free regions can be observed in the nonstratified positive column of a dc discharge in microgravity conditions [38]. The observation of the dustfree regions in the cloud of dust particles in the center of a combined rf+dc discharge in gravity conditions was recently * fedoseev@itp.nsc.ru reported by Mitic [43].…”

Section: Introductionmentioning

confidence: 90%

Dust-void formation in a dc glow discharge

et al. 2015

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Experimental investigations of dusty plasma parameters of a dc glow discharge were performed in a vertically oriented discharge tube. Under certain conditions, dust-free regions (voids) were formed in the center of the dust particle clouds that levitated in the strong electric field of a stratified positive column. A model for radial distribution of dusty plasma parameters of a dc glow discharge in inert gases was developed. The behavior of void formation was investigated for different discharge conditions (type of gas, discharge pressure, and discharge current) and dust particle parameters (particle radii and particle total number). It was shown that it is the ion drag force radial component that leads to the formation of voids. Both experimental and calculated results show that the higher the discharge current the wider dust-free region (void). The calculations also show that more pronounced voids are formed for dust particles with larger radii and under lower gas pressures.

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“…The oscillating electric field polarizes the shielding cloud of the microparticles, which leads to the appearance of the quadrupole term in their interaction potential [16]. Usage of dc electric field is not practical in complex plasmas since it causes instabilities in the microparticle suspensions [29][30][31] and under microgravity conditions also their drift [31][32][33]. In the present work, the so-called "polarity switching" mode [20] of the dc discharge in the PK-4 setup was used.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional structure of a string-fluid complex plasma

Pustylnik

Klumov

Rubin-Zuzic

et al. 2020

Phys. Rev. Research

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Three-dimensional structure of complex (dusty) plasmas was investigated under long-term microgravity conditions in the Plasmakristall-4 facility on the International Space Station. The microparticle suspensions were confined in a polarity-switched dc discharge. The experimental results were compared to the results of the molecular dynamics simulations with the interparticle interaction potential represented as a superposition of isotropic Yukawa and anisotropic quadrupole terms. Both simulated and experimental data exhibited qualitatively similar structural features, indicating the bulk liquid-like order with the inclusion of solid-like strings aligned with the axial electric field. Individual strings were identified and their size spectrum was calculated. The decay rate of the size spectrum was found to decrease with the enhancement of string-like structural features.

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Particle flows in a dc discharge in laboratory and microgravity conditions

Cited by 36 publications

References 53 publications

Cage correlation and diffusion in strongly coupled three-dimensional Yukawa systems in magnetic fields

Cage correlation and diffusion in strongly coupled three-dimensional Yukawa systems in magnetic fields

Dust-void formation in a dc glow discharge

Three-dimensional structure of a string-fluid complex plasma

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