Excitation of dust density waves in weak electric fields

Yaroshenko, V. V.; Khrapak, S. A.; Thomas, Hubertus M.; Morfill, G. E.

doi:10.1063/1.3682989

Cited by 15 publications

(8 citation statements)

References 26 publications

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“…Most of these effects can be relatively easily included into the conventional fluid formalism, for some relevant examples we refer to Refs. [63][64][65][66][67][68][69][70]. Thus, careful analysis of the most important processes in each concrete practical situation is required.…”

Section: Discussionmentioning

confidence: 99%

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak¹,

Thomas²

2015

Phys. Rev. E

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The conventional fluid description of multi-component plasma, supplemented by an appropriate equation of state for the macroparticle component, is used to evaluate the longitudinal sound velocity of Yukawa fluids. The obtained results are in very good agreement with those obtained earlier employing the quasi-localized charge approximation and molecular dynamics simulations in a rather broad parameter regime. Thus, a simple yet accurate tool to estimate the sound velocity across coupling regimes is proposed, which can be particularly helpful in estimating the dust-acoustic velocity in strongly coupled dusty (complex) plasmas. It is shown that, within the present approach, the sound velocity is completely determined by particle-particle correlations and the neutralizing medium (plasma), apart from providing screening of the Coulomb interaction, has no other effect on the sound propagation. The ratio of the actual sound velocity to its "ideal gas" (weak coupling) scale only weakly depends on the coupling strength in the fluid regime, but exhibits a pronounced decrease with the increase of the screening strength. The limitations of the present approach in applications to real complex plasmas are briefly discussed.

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Section: Discussionmentioning

confidence: 99%

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak¹,

Thomas²

2015

Phys. Rev. E

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“…The quantity id is a strong function of grain charge and dust density, and it might easily be of the same order of magnitude as in . 7,13,23,24 Finally, the conductivity components contain additional terms associated with charged grains whose impact depends on the value of p and the dust Hall parameter g d ¼ x Bd / d , where the quantity d in a similar way defines the net collisional frequency…”

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confidence: 99%

Reversed Hall effect and plasma conductivity in the presence of charged impurities

Yaroshenko

Lühr

2018

Physics of Plasmas

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The Hall conductivity of magnetized plasma can be strongly suppressed by the contribution of negatively charged particulates (referred further as “dust”). Once the charge density accumulated by the dust exceeds a certain threshold, the Hall component becomes negative, providing a reversal in the Hall current. Such an effect is unique for dust-loaded plasmas, and it can hardly be achieved in electronegative plasmas. Further growth of the dust density leads to an increase in both the absolute value of the Hall and Pedersen conductivities, while the field-aligned component is decreased. These modifications enhance the role of transverse electric currents and reduce the anisotropy of a magnetized plasma when loaded with charged impurities. The findings provide an important basis for studying the generation of electric currents and transport phenomena in magnetized plasma systems containing small charged particulates. They can be relevant for a wide range of applications from naturally occurring space plasmas in planetary magnetospheres and astrophysical objects to laboratory dusty plasmas (Magnetized Dusty Plasma Experiment) and to technological and fusion plasmas.

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“…Since being initially predicted in 1990 1 and identified experimentally in 1995, 2 the DAW has been a topic of great experimental, [3][4][5][6][7][8][9][10] and theoretical, [11][12][13][14] interest within the dusty plasma community. While the majority of the experimental studies of this wave mode have been restricted to measurements in a two-dimensional plane (i.e., the slice of the dust cloud illuminated by a thin laser sheet) and a number of these studies have hinted that the wave motion associated the dust acoustic wave is three-dimensional, there have been relatively few studies that have examined the potential three-dimensional wave motion associated with this wave mode.…”

Section: Introductionmentioning

confidence: 99%

Volumetric measurements of a spatially growing dust acoustic wave

Williams

2012

Physics of Plasmas

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In this study, tomographic particle image velocimetry (tomo-PIV) techniques are used to make volumetric measurements of the dust acoustic wave (DAW) in a weakly coupled dusty plasma system in an argon, dc glow discharge plasma. These tomo-PIV measurements provide the first instantaneous volumetric measurement of a naturally occurring propagating DAW. These measurements reveal over the measured volume that the measured wave mode propagates in all three spatial dimensional and exhibits the same spatial growth rate and wavelength in each spatial direction.

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Excitation of dust density waves in weak electric fields

Cited by 15 publications

References 26 publications

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Reversed Hall effect and plasma conductivity in the presence of charged impurities

Volumetric measurements of a spatially growing dust acoustic wave

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