Energy Loss of a Test Charge in Collisional Dusty Plasmas

Nasim, M. H.; Mirza, Arshad M.; Murtaza, G.; Shukla, P. K.

doi:10.1238/physica.regular.061a00628

Cited by 9 publications

(5 citation statements)

References 25 publications

(27 reference statements)

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“…where ϕ d is the surface potential of the dust grain and in equilibrium, I M e0 + I M i0 = 0. By letting ϕ d = ϕ d0 + ϕ d1 ≡ (q d0 + q d1 )/r d = q d /r d and assuming ϕ 1 ϕ 0 and eϕ/T e 1, we obtain from equations ( 8) and ( 9) the equilibrium and the fluctuating electron currents as follows [17] I M e0 = −4πr Similarly for ions,…”

Section: Dust-charge Fluctuation Using Maxwellian Distribution Functionmentioning

confidence: 99%

Dust-charge fluctuations with non-Maxwellian distribution functions

2006

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Dust grains immersed in a plasma can exhibit charge fluctuations in response to the oscillatory plasma currents flowing onto them. The fluctuation electrodynamics of dusty plasmas are determined by taking into account the dynamics of charging processes associated with plasma currents. Expressions for the charging currents are derived using kappa and generalized (r, q) distribution functions. The dispersion relation of dust-acoustic waves is modified while taking into account these distribution functions. Further, it is found that in the limit (i) r = 0, q → ∞ and (ii) κ → ∞, the expressions of the current modified with (r, q) and kappa distributions reduce to the Maxwellian current.

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Section: Dust-charge Fluctuation Using Maxwellian Distribution Functionmentioning

confidence: 99%

Dust-charge fluctuations with non-Maxwellian distribution functions

2006

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“…[2][3][4][5] The inclusion of a dust component in normal electron-ion plasmas has led to a renewed interest in the test charge response problem. [2][3][4][5] The inclusion of a dust component in normal electron-ion plasmas has led to a renewed interest in the test charge response problem.…”

Section: Introductionmentioning

confidence: 99%

Test charge response for a dusty plasma with both grain size distribution and dynamical charging

Raadu

Shafiq

2007

Physics of Plasmas

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The form of the grain size distribution strongly influences the linear dielectric response of a dusty plasma. For a class of size distributions and a thermal velocity distribution, there is an equivalence to a Lorentzian distribution of monosized particles. The electrostatic response to a slowly moving test charge can then be found. Dynamical charging of grains in a dusty plasma leads to an enhanced time-dependent shielding of a test charge. Here the combined effect of both grain size distribution and dynamical grain charging on the response to a slowly moving test charge is analyzed. The dynamical charging contribution to the plasma dielectric has a complicated dependence on the parameters for the size distribution and on the charging rate. However, this dependence can be expressed in terms of known functions. Series expansions are used to derive the potential response to a slowly moving test charge. Previously known results may be recovered as special limiting cases of this investigation. The analytical expression for the plasma dielectric may be used for more general cases and is applicable to the study of electrostatic waves.

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“…19,20 The maximum energy exchange occurs for particles at the sonic speed. 21 In the case of multiple test charges, correlation effects distort the potential profile. 22 The dispersion function of a dusty plasma is modified if the grains are elongated, 23 and the consequences for an array of test charges has recently been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Recent work has included the effects of charge fluctuations in numerical studies of the energy loss of a test charge moving through a dusty plasma. 30,31 In the case of nonlinear electrostatic waves the effects of charge fluctuations can be dealt with by using a generalization of the Sagdeev potential. 32 In this paper, the effect of charge fluctuations on the response of dusty plasma is included in a standard linearized dielectric description as in previous work.…”

Section: Introductionmentioning

confidence: 99%

Shielding of a slowly moving test charge in a dusty plasma with dynamical grain charging

Raadu

Shafiq

2003

Physics of Plasmas

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The dynamical charging of grains in a dusty plasma enhances the shielding of test charges. Time scales for charging are determined by the ambient plasma parameters and the grain dimensions. They can be very short, approaching the ion plasma period for grain sizes of the order of an electron Debye length. For a slowly moving test charge the response potential is found as a power series in the test charge velocity. Collisional effects are included. Analytical expressions for the response potential, valid for all radial distances, are found up to second order in the test charge velocity. The first-order dynamical charging term is shown to be the consequence of the delay in the shielding due to the dynamics of the charging process. The remaining first-order terms are given by analytical expressions that yield the well known asymptotic power law forms for large distances.

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Energy Loss of a Test Charge in Collisional Dusty Plasmas

Cited by 9 publications

References 25 publications

Dust-charge fluctuations with non-Maxwellian distribution functions

Dust-charge fluctuations with non-Maxwellian distribution functions

Test charge response for a dusty plasma with both grain size distribution and dynamical charging

Shielding of a slowly moving test charge in a dusty plasma with dynamical grain charging

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