Dust Charge in Cryogenic Environment

Kubota, J.; Kojima, C.; Sekine, Wataru; Ishihara, Osamu

doi:10.1063/1.2996964

Cited by 8 publications

(8 citation statements)

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“…The microparticles in size of submicrometers to submillimeters have been called as dust grains or dust particles in the study of interstellar space as early as 1940s. Complex plasma has attracted much attention to the community of plasma physics [1][2][3][4], while recent advances in ultracold plasma [5][6][7][8][9] and cryogenic dusty plasma [10][11][12][13][14][15][16][17] challenge the basic understanding of plasmas. The Debye length, characterized by temperatures of electrons and ions, in a cryogenic plasma becomes much smaller than that in a conventional laboratory plasma and becomes comparable to the size of a dust particle.…”

Section: Introductionmentioning

confidence: 99%

Low-dimensional structures in a complex cryogenic plasma

Ishihara¹

2012

Plasma Phys. Control. Fusion

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Complex cryogenic plasma is theoretically and experimentally studied. In a cryogenic plasma the Debye length becomes smaller and the shielding length becomes comparable to a dust size. Dust charging in a cryogenic plasma is examined in detail by considering the polarization effect on a dust particle due to charged plasma particles. Electrons are found to be attracted to a dust particle when they come closer to a dust particle within a distance from the surface of a dust particle given by r = a((εwhere a is the radius of a spherical dust particle, ε is the dielectric constant of the dust particle, Z d is the charge state of a dust particle and λ D is the Debye length. Microscopic electron collection flux balancing with desorption electron flux determines the dust charge. Negatively charged dust particles form two-dimensional crystal structures and the displacement from the equilibrium positions shows normal modes with a dispersion relation. Experimental study determines dust charges on a cryogenic temperature.

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Section: Introductionmentioning

confidence: 99%

Low-dimensional structures in a complex cryogenic plasma

Ishihara¹

2012

Plasma Phys. Control. Fusion

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“…A neutral shadowing force (1) acts as an additional repulsion force and with Coulomb's force adds up to a greater net repulsion force causing a less dense system which was observed by Ishihara and his co-workers. 1) At the parameters of plasma in Refs. 2, 3 the strength of a neutral shadowing force is much less than that of Coulomb's force and shows no impact.…”

Section: Introductionmentioning

confidence: 99%

“…6,7) In this work we focus on the mean square displacement of dust particles (MSD), which characterizes the diffusion of particles. The MSD is calculated by performing a Langevin dynamics simulation taking into account the screened Coulomb interaction and neutral shadowing force (1).…”

Section: Introductionmentioning

confidence: 99%

Subdiffusion of dust particles in cryogenic plasmas

Aldakulov¹,

Moldabekov²,

Muratov³

et al. 2020

Jpn. J. Appl. Phys.

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Neutral shadowing force, which becomes comparable with a screened Coulomb force at extreme cryogenic conditions, can significantly change the properties of complex plasmas. In this work, the impact of neutral shadowing force on the mean square displacement (MSD) of dust particles is investigated. This is done by performing Langevin dynamics simulations of a 2D system of strongly correlated particles. The results of this work show that the additional force due to the neutral shadowing effect has a strong impact on MSD, i.e. the diffusive motion of particles, only if the mean free path of neutral gas particles exceeds the mean inter-dust-particle distance. In the latter case, we find that neutral shadowing force leads to subdiffusion on time scales of the order of tens or hundreds of dust particle plasma oscillation periods. Furthermore, we find that neutral shadowing force can strongly hinder the transition from anomalous diffusion to normal diffusion.

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“…A dusty plasma, being experimentally relatively easy realizable and observable, attracts interest as a system for investigation of many‐particle physics; e.g., waves and wakefield . Dusty plasma experiments were carried out under various conditions, including both terrestrial and space (microgravity) as well as cryogenic . It was found that in complex plasmas, interaction between particles deviates from the screened Coulomb potential due to a non‐equilibrium state of a plasma .…”

Section: Introductionmentioning

confidence: 99%

Impacts of neutral shadowing force on dust particle dynamics in cryogenic plasma

Muratov

Aldakulov

Рамазанов

et al. 2019

Contributions to Plasma Physics

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Recently, it was shown that the neutral shadowing force can have a strong impact on the structural properties of the charged dust particles in cryogenic dusty plasmas. Therefore, in this work, we have investigated the impact of the neutral shadowing force on the dynamical properties by means of molecular dynamics simulations. By computing the velocity auto‐correlation function of particles and their spectrum, we found that the neutral shadowing force has a strong impact on the dust particle dynamics if the mean free path of neutrals exceeds the mean inter‐dust particle distance.

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Dust Charge in Cryogenic Environment

Cited by 8 publications

References 0 publications

Low-dimensional structures in a complex cryogenic plasma

Low-dimensional structures in a complex cryogenic plasma

Subdiffusion of dust particles in cryogenic plasmas

Impacts of neutral shadowing force on dust particle dynamics in cryogenic plasma

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