Wakes in inhomogeneous plasmas

Kompaneets, R.; Ivlev, A. V.; Nosenko, V.; Morfill, G. E.

doi:10.1103/physreve.89.043108

Cited by 19 publications

(18 citation statements)

References 93 publications

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“…Single dust grain simulations have investigated in detail the charging of the dust grain [6][7][8] , wake potential 4,[9][10][11] and the influence of the surrounding plasma properties like pressure 9,12 , ion speed 8,13,14 , charge exchange 12,[15][16][17] and inhomogeneties in the plasma sheath 9,18 . In twoparticle chains it has been found numerically that the negative charge of the downstream grain is reduced because the ion focus of the upstream grain increases the ion current onto the grain 19,20 .…”

Section: Introductionmentioning

confidence: 99%

Plasma flow around and charge distribution of a dust cluster in a rf discharge

et al. 2018

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We employ a particle-in-cell Monte Carlo collision/particle-particle particle-mesh (PIC-MCC/PPPM) simulation to study the plasma flow around and the charge distribution of a threedimensional dust cluster in the sheath of a low-pressure rf argon discharge. The geometry of the cluster and its position in the sheath are fixed to the experimental values, prohibiting a mechanical response of the cluster. Electrically, however, the cluster and the plasma environment, mimicking also the experimental situation, are coupled self-consistently. We find a broad distribution of the charges collected by the grains. The ion flux shows on the scale of the Debye length strong focusing and shadowing inside and outside the cluster due to the attraction of the ions to the negatively charged grains whereas the electron flux is characterized on this scale only by a weak spatial modulation of its magnitude depending on the rf phase. On the scale of the individual dust potentials, however, the electron flux deviates in the vicinity of the cluster strongly from the laminar flow associated with the plasma sheath. It develops convection patterns to compensate for the depletion of electrons inside the dust cluster.

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Section: Introductionmentioning

confidence: 99%

Plasma flow around and charge distribution of a dust cluster in a rf discharge

et al. 2018

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“…Very recently, the extremely useful form of the effective potential (Kompaneets et al 2009) ϕ(r) of a dust charge Q including the spherical polarization effect at arbitrary distances r up to the M 4 -term with the presence of the ion flow in a dusty plasma is given by the following form:…”

Section: Effective Potential and Cross Sectionmentioning

confidence: 99%

Influence of the ion wake-field on the eikonal cross section for the electron–dust collision in dusty plasmas

Jung

Hong

2012

J. Plasma Phys.

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The ion wake-field effects on the elastic electron-dust collisions are investigated in complex dusty plasmas. The eikonal method is employed to investigate the behaviors of the scattering phase shift and scattering cross section due to the variation of the strength of the wake-field. It is shown that the eikonal phase shift decreases with an increase of the Mach number and increases with an increase of the impact parameter. It is also shown that the eikonal phase shift decreases with increasing Debye length. The eikonal cross section for the elastic electron-dust collision is found to be increased due to the influence of the wake-field. In addition, it is found that the wake-field effect on the eikonal cross section is almost independent of the Debye length.

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“…The principal assumption of our present approach is the homogeneous plasma approximation, in which all unperturbed (by the particle) quantities do not depend on the vertical coordinate. This is a common assumption, and we have recently shown it to be quite accurate to describe the shielding at moderate distances, particularly in the direction perpendicular to the flow [35]. Thus, the steady state in our model is determined simply by the balance of the electric field and collisions, (eE sh /m) · ∂f /∂v = St[f ].…”

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confidence: 99%

“…Thus, the steady state in our model is determined simply by the balance of the electric field and collisions, (eE sh /m) · ∂f /∂v = St[f ]. To calculate ϕ(r), we use the linear perturbation approximation [2,4,26,27,35], i.e., we linearize Eqs. (1) and (2) with respect to the perturbations induced by the particle.…”

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confidence: 99%

Interparticle Attraction in 2D Complex Plasmas

2016

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Complex (dusty) plasmas allow experimental studies of various physical processes occurring in classical liquids and solids by directly observing individual microparticles. A major problem is that the interaction between microparticles is generally not molecularlike. In this Letter, we propose how to achieve a molecularlike interaction potential in laboratory 2D complex plasmas. We argue that this principal aim can be achieved by using relatively small microparticles and properly adjusting discharge parameters. If experimentally confirmed, this will make it possible to employ complex plasmas as a model system with an interaction potential resembling that of conventional liquids.

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Wakes in inhomogeneous plasmas

Cited by 19 publications

References 93 publications

Plasma flow around and charge distribution of a dust cluster in a rf discharge

Plasma flow around and charge distribution of a dust cluster in a rf discharge

Influence of the ion wake-field on the eikonal cross section for the electron–dust collision in dusty plasmas

Interparticle Attraction in 2D Complex Plasmas

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