Wake Formation and Wake Field Effects in Complex Plasmas

Block, Dietmar; Carstensen, J.; Ludwig, P.; Miloch, W. J.; Greiner, Franko; Piel, A.; Bönitz, M.; Melzer, A.

doi:10.1002/ctpp.201200030

Cited by 56 publications

(35 citation statements)

References 58 publications

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“…Vertically aligned particles, however, are levitated by an electric field that is stronger for the lower microparticle so that the two have different charges as was reported in Refs. [34,35,38,[68][69][70]. In the experiment by Carstensen et al [38], it was estimated that for their experimental conditions, the lower microparticle particle had a charge only 78% as large, i.e., Q β /Q α = 0.78.…”

Section: Experiments and Analysismentioning

confidence: 99%

Experimental measurement of velocity correlations for two microparticles in a plasma with ion flow

Mukhopadhyay

Goree

2014

Phys. Rev. E

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Velocity correlations are measured in a dusty plasma with only two microparticles. These correlations allow a characterization of the oscillatory modes and an identification of the effects of ion wakes. Ion wake effects are isolated by comparing two experiments with the microparticles aligned parallel vs perpendicular to the ion flow. From records of microparticle velocities, the one- and two-particle distribution functions f(1) and f(2) are obtained, and the two-particle correlation function g(2) ≡ f(2)-f(1)f(1) is calculated. Comparing the two experiments, we find that motion is much more correlated when the microparticles are aligned with the ion flow and the character of the oscillatory modes depends on the ion flow direction due to the ion wake.

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Section: Experiments and Analysismentioning

confidence: 99%

Experimental measurement of velocity correlations for two microparticles in a plasma with ion flow

Mukhopadhyay

Goree

2014

Phys. Rev. E

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“…The neutral gas does not enter the DF directly but can modify the ion response considerably due to ion-neutral collisions ‡ For a more extensive list of earlier work see [11,12].…”

Section: Dielectric Function Approachmentioning

confidence: 99%

Screened Coulomb potential in a flowing magnetized plasma

Joost

Ludwig

Kählert

et al. 2014

Plasma Phys. Control. Fusion

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Abstract. The electrostatic potential of a moving dust grain in a complex plasma with magnetized ions is computed using linear response theory, thereby extending our previous work for unmagnetized plasmas [P. Ludwig et al., New J. Phys. 14, 053016 (2012)]. In addition to the magnetic field, our approach accounts for a finite ion temperature as well as ion-neutral collisions. Our recently introduced code Kielstream is used for an efficient calculation of the dust potential. Increasing the magnetization of the ions, we find that the shape of the potential crucially depends on the Mach number M . In the regime of subsonic ion flow (M < 1), a strong magnetization gives rise to a potential distribution that is qualitatively different from the unmagnetized limit, while for M > 1 the magnetic field effectively suppresses the plasma wakefield.

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“…In the linear response (LR) formalism, e.g. 16,18,19 , the wake potential is linearly proportional to the grain charge, Q d . Winske et al 17 , however, found a nonlinear relationship between charge and wake potential utilizing one-and two-dimensional PIC-simulations.…”

Section: Introductionmentioning

confidence: 99%

Impact of collisions on the dust wake potential with Maxwellian and non-Maxwellian ions

et al. 2017

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This work examines the formation of wake fields caused by ions streaming around a charged dust particle, using three-dimensional particle-in-cell (PIC) simulations with charge-neutral collisions included. The influence of an external driving electric field, which leads to a non-Maxwellian distribution of ions, is investigated in detail. The wake features formed for non-Maxwellian ions exhibit significant deviations from those observed within the model of a shifted Maxwellian distribution. The dependence of the peak amplitude and position of the wake potential upon the degree of collisionality is analyzed for a wide range of streaming velocities (Mach numbers). In contrast to a shifted Maxwellian distribution of ions, the drift-driven non-Maxwellian distribution exhibits an increase of the wake amplitude of the first attractive peak with increase in collisionality for high streaming velocities. At very low Mach numbers, collision-induced amplification is observed for Maxwellian as well as non-Maxwellian distributions.

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Wake Formation and Wake Field Effects in Complex Plasmas

Cited by 56 publications

References 58 publications

Experimental measurement of velocity correlations for two microparticles in a plasma with ion flow

Experimental measurement of velocity correlations for two microparticles in a plasma with ion flow

Screened Coulomb potential in a flowing magnetized plasma

Impact of collisions on the dust wake potential with Maxwellian and non-Maxwellian ions

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