Charging and dynamics of a dust grain in the wake of another grain in flowing plasmas

Miloch, W. J.; Kroll, M.; Block, Dietmar

doi:10.1063/1.3488252

Cited by 67 publications

(85 citation statements)

References 29 publications

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“…Figure 4 shows the qualitatively similar physical roles played by collisional and collisionless damping for the topology of the potential. Maxwellian ions with low ionneutral damping lead to pronounced oscillations of the wake potential in the streaming direction, which is well known from linear response calculations 16,18 and PIC simulations 18,20,30,31 . However, these oscillations are almost completely absent in the case of non-Maxwellian ions 25 .…”

Section: A Scaling With Grain Chargementioning

confidence: 76%

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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Section: A Scaling With Grain Chargementioning

confidence: 76%

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

et al. 2017

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“…[They appear also to omit the electron pressure force.] Miloch et al [13] treat a grain truly in the wake of another but obtain the field force from a heuristic integration of inter-particle forces over a somewhat ill-defined region. Their results show some of the qualitative features of the present calculations, but do not appear to be quantitatively rigorous.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Forces on a Small Grain in the Nonlinear Plasma Wake of Another

Hutchinson

2011

Phys. Rev. Lett.

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The transverse force on a spherical charged grain lying in the plasma wake of another grain is analysed to assess the importance of ion-drag perturbation, in addition to the wake-potentialgradient. The ion-drag perturbation is intrinsically one order smaller than the wake-potential force in the ratio of grain size (rp) to Debye length (λDe). So ion-drag perturbation is important only in nonlinear wakes. Rigorous particle-in-cell calculations of the force are performed in the nonlinear regime with two interacting grains. It is found that even for quite large grains, rp/λDe = 0.1, the force is dominated by the wake-potential-gradient. The wake potential structure can then help explain the preferred alignment of floating dust grains.

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“…Numerical simulations reveal that a downstream grain will be strongly decharged due to enhanced ion current when entering the Mach-like cone in the wake (Miloch et al 2010). As the levitation height of the grain depends on its charge, this decharging can explain the sudden transition from the horizontal to vertical alignment that has been observed in laboratory experiments with two grains (Hebner and Riley 2004;Samarian et al 2005;Carstensen et al 2012).…”

Section: Resultsmentioning

confidence: 95%

Numerical simulations of dust charging and wakefield effects

Miloch

2014

J. Plasma Phys.

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Charging of dust grains and related phenomena are fundamental problems in the physics of complex plasmas. The relative motion of grains and plasma breaks the symmetry in dust charging and gives rise to the wake in plasma density and potential, which can significantly influence the dynamics of other grains. This paper gives an overview of dust charging in two-and multi-component plasma flows and related wake effects, and presents recent results from self-consistent particle-in-cell (PIC) simulations. The role of wakefields is considered in the context of charging of downstream grains.

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Charging and dynamics of a dust grain in the wake of another grain in flowing plasmas

Cited by 67 publications

References 29 publications

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

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

Forces on a Small Grain in the Nonlinear Plasma Wake of Another

Numerical simulations of dust charging and wakefield effects

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