On the dielectric response function and dispersion relation in strongly coupled magnetized dusty plasmas

Shahmansouri, M.; Khodabakhshi, N.

doi:10.1088/1674-1056/27/10/105206

Cited by 5 publications

(1 citation statement)

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“…Since then, many investigations have been made to explain the wakefield potential distribution in different scenarios (Lemons et al, 2000;Ali, 2009;Ali, 2016). The dielectric response function and modified potential distribution around a test charge have also been studied in strongly coupled unmagnetized and magnetized dusty plasmas (Shahmansouri et al, 2017;Shahmansouri and Khodabakhshi, 2018;Shahmansouri, 2019).…”

Section: Introductionmentioning

confidence: 99%

Test charge driven response of a dusty plasma with polarization force

Ali

Masood²,

Singh³

et al. 2022

Front. Astron. Space Sci.

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By using the framework of kinetic model, the test charge driven response of a dusty plasma is evaluated in the presence of polarization force. The plasma containing electrons, singly ionized positive ions, and highly charged negative dust particulates is known as a dusty plasma, which can be perturbed by a test particle of charge qT moving with velocity vT along the z-axis. The polarization force purely comes from the high charging state of micron-sized dust particles, causing a deformation of shielding length due to density gradient and modifying the collective motion and particulates’ acceleration. The application of Fourier transformation technique to the set of dynamical equations may result in the shielded potential for a test charge with a modified dielectric constant. Several possibilities have been explored to evaluate the shielded potentials by imposing different conditions on the test charge speed in comparison with the thermal speeds of plasma species. It is found that the profiles of wakefield, Debye-Hückel and farfield (FF) potentials are strongly modified by the polarization force coefficient via the dust charging state and dust concentration. The present findings are useful in the study of strongly coupled dusty plasma, where micron-sized negatively charged dust grains are characterized by a high charging state.

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Section: Introductionmentioning

confidence: 99%

Test charge driven response of a dusty plasma with polarization force

Ali

Masood²,

Singh³

et al. 2022

Front. Astron. Space Sci.

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Fluid dispersion relation of dust acoustic wave with ion flow

Saitou

2021

Physics of Plasmas

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The fluid dispersion relation of the dust acoustic wave in a plasma, which consists of electrons, an ion flow, and a dust fluid, is investigated. The dispersion relation has a form similar to that of the conventional one of the ion acoustic wave. It can be transformed into a form that includes the energy exchange factor between the ion flow and dust fluid. The dust acoustic wave can be controlled by varying the ion flow velocity. Varying the ion flow velocity is equivalent to varying the energy exchange factor. In the region where the energy exchange factor is negative, the dust acoustic wave does not propagate and the net energy of the dust fluid is expected to be transferred to the ion flow. In contrast, in the regions where the exchange factor is positive, the dust acoustic wave propagates.

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