Influence of a Polarization Force on Dust Acoustic Waves

Khrapak, S. A.; Ivlev, A. V.; Yaroshenko, V. V.; Morfill, G. E.

doi:10.1103/physrevlett.102.245004

Cited by 149 publications

(142 citation statements)

References 31 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%

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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%

“…The polarization force is small in most practical situations occurring in complex (dusty) plasmas, but can affect considerably the dispersion of dust acoustic waves as has been pointed out in Ref. [67].…”

mentioning

confidence: 97%

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

Khrapak¹,

Thomas²

2015

Phys. Rev. E

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“…As shown by Khrapak et al [5] for Boltzmannian electrons and ions, the polarization force can be written as…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the parameter R = F p /F e represents the relative importance of the polarization force. Using such a model form of the polarization force, Khrapak et al [5] demonstrated that the polarization effect can play an important role in the propagation characteristics of the linear low-frequency DAWs. In particular, the polarization effect causes a decrease of the wave phase velocity.…”

Section: Introductionmentioning

confidence: 99%

“…, where λ D = λ Di / 1 + (λ Di /λ De ) 2 is the linearized Debye length, with λ Di(e) = 0 k B T  /n  e 2 being the ion (electron) Debye length, T =i,e the temperatures in energy unit, and n =i,e the number densities [5,6,7,8,9]. As shown by Khrapak et al [5] for Boltzmannian electrons and ions, the polarization force can be written as…”

Section: Introductionmentioning

confidence: 99%

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Modified KdV equation for trapped ions in polarized dusty plasma

Singh

Kaur

Sethi

et al. 2018

AIP Conference Proceedings

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Abstract. In this investigation, the effect of polarization force on dust acoustic solitary waves (DAS W s) has been presented in a dusty plasma composed of Maxwellian electrons, vortex-like (trapped) ions, and negatively charged mobile dust grains. It has been found that from the Maxwellian ions distribution to a vortex-like one, the dynamics of small but finite amplitude DA solitary waves is governed by a nonlinear equation of modified Korteweg-de Vries (mKdV) type instead of KdV. The combined effect of trapped ions and polarization force strongly influence the characteristics of DAS W s. Only rarefactive solitary structures are formed under the influence of ions trapping and polarization force. The implications of our results are useful in real astrophysical situations of space and laboratory dusty plasmas.

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Effect of the Polarization Force on the Dust–Acoustic Soliton Energy

Mayout

Bentabet

Tribeche

2016

Contrib. Plasma Phys.

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The role the polarization force acting on dust particles may play on the energy carried by the dust-acoustic (DA) soliton is examined. This force is due to the deformation of the Debye sheath around the dust particulates in the background of non-uniform plasmas. The energy carried by the DA solitons is derived. This energy decreases with an increase in the effects of plasma-dust particles polarization interaction. This means that when the magnitude of the polarization force approaches the one of the electrical force, i.e, the net force acting on the grains decreases, the DA soliton energy experiences a depletion. As noticed by Khrapak et al. [S.A. Khrapak et al., Phys. Rev. Lett. 102, 245004 (2009)], when the polarization force dominates over the electrical one, the plasma can not support DA solitons. This happens whenever the dust grain size exceeds a critical threshold. In this case, the net force acting on the grains is no longer a restoring force.

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Influence of a Polarization Force on Dust Acoustic Waves

Cited by 149 publications

References 31 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

Modified KdV equation for trapped ions in polarized dusty plasma

Effect of the Polarization Force on the Dust–Acoustic Soliton Energy

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