Effects of dust-charge fluctuations on the potential of an array of projectiles in a partially ionized dusty plasma

Ali, S.; Nasim, M. H.; Murtaza, G.

doi:10.1063/1.1619976

Cited by 20 publications

(9 citation statements)

References 21 publications

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“…Now solving the DH potential first, we need to express the wave, position, and velocity vectors into spherical polar coordinates (Yaqoob et al, 2002;Ali et al, 2003), respectively, as k (k sin θ k cos ϕ k , k sin θ k sin ϕ k , k cos θ k ), r (r sin θ r cos ϕ r , r sin θ r sin ϕ r , r cos θ r ), and v T (0, 0, v T ).…”

Section: Potential Distribution Around the Resonating Test Chargementioning

confidence: 99%

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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: Potential Distribution Around the Resonating Test Chargementioning

confidence: 99%

“…After some more simplifications, Eq. 14 is finally reduced to the following result (Ali et al, 2003)…”

Section: Potential Distribution Around the Resonating Test Chargementioning

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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“…Test charge techniques [12,13] can be utilized to study the shielding of test charges in collisional [14] and turbulent [15] plasmas, the electric field [16], and farfield potential of a test charge in a nonuniform magnetoplasma [17], the wake-field excitations in charge fluctuating dusty plasmas [18], the two-body correlations [19], the energy loss of test charges [20], etc. If a test particle is projected into the plasma with a constant speed, its charge density is coupled with the plasma charge density by the space charge effects.…”

Section: Dusty Plasma and Test Charge Techniquementioning

confidence: 99%

“…It was found that external magnetic field and ion-streaming effects [40,41] strongly affect the positive/negative potential regions in plasmas. To explore the effects of two-body correlations, dust-charge perturbations and dustneutral collisions, various geometries have been designed for propagating test charges [18][19][20] in an unmagnetized Maxwellian dusty plasma. In all above investigations, the plasma particles are described by the Maxwellian distribution function.…”

Section: Dusty Plasma and Test Charge Techniquementioning

confidence: 99%

Plasma Diagnostic Methods: Test Charge Response in Lorentzian Dusty Plasmas

Ali¹,

Al-Hadeethi²

2020

Selected Topics in Plasma Physics

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Different plasma diagnostic methods are briefly discussed, and the framework of a test charge technique is effectively used as diagnostic tool for investigating interaction potentials in Lorentzian plasma, whose constituents are the superthermal electrons and ions with negatively charged dust grains. Applying the space-time Fourier transformations to the linearized coupled Vlasov-Poisson equations, a test charge potential is derived with a modified response function due to energetic ions and electrons. For a test charge moving much slower than the dust-thermal speed, there appears a short-range Debye-Hückel (DH) potential decaying exponentially with distance and a long-range far-field (FF) potential as the inverse cube of the distance from test charge. The FF potentials exhibit more localized shielding curves for low-Kappas, and smaller effective shielding length is observed in dusty plasma compared to electron-ion plasma. However, a wakefield (WF) potential is formed behind the test charge when it resonates with dust-acoustic oscillations, whereas a fast moving test charge leads to the Coulomb potential having no shielding around. It is revealed that superthermality and plasma parameters significantly alter the DH, FF, and WF potentials in space plasmas of Saturn’s E-ring, where power-law distributions can be used for energetic electrons and ions in contrast to Maxwellian dust grains.

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“…Quantum plasma's are generally made of electrons and ions or holes. The studies on quantum plasma got importance in several branches of applied physics specially in nano-science [19][20][21] as well as in laboratory plasma experiments [22][23][24][25] and in astrophysical scenario [26][27][28]. Pine [29] have treated an arbitrary collision-less quantum plasma environment as a dielectric medium and derived the analytic form of dielectric function using Random Phase Approximation (RPA) method.…”

Section: Introductionmentioning

confidence: 99%

Precise energy eigenvalues of hydrogen-like ion moving in quantum plasmas

2015

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The analytic form of the electrostatic potential felt by a slowly moving test charge in quantum plasma is being derived. It has been shown that the potential composed of two parts: Debye-Huckel screening term and near-field wake potential which depends on the velocity of the test charge and the number density of the plasma electrons. Rayleigh-Ritz variational calculation has been done to estimate precise energy eigenvalues of hydrogen-like ion under such plasma environment. A detailed analysis shows that the energy levels are gradually moves to the continuum with increasing plasma electron density while level crossing phenomenon have been observed with the variation of ion velocity.

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Effects of dust-charge fluctuations on the potential of an array of projectiles in a partially ionized dusty plasma

Cited by 20 publications

References 21 publications

Test charge driven response of a dusty plasma with polarization force

Test charge driven response of a dusty plasma with polarization force

Plasma Diagnostic Methods: Test Charge Response in Lorentzian Dusty Plasmas

Precise energy eigenvalues of hydrogen-like ion moving in quantum plasmas

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