Dynamic nature of the ion wake in dusty plasmas

Rovagnati, B.; Lapenta, Giovanni; Mashayek, Farzad

doi:10.1016/j.physleta.2008.08.013

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…In a plasma with ions streaming at a uniform velocity, the dust potential becomes (strongly) anisotropic and takes the form of an oscillatory wake structure in the downstream direction, which was subject to various analytical and numerical studies e.g. [26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42] 1 . This wake can result in attractive, non-reciprocal forces between the equally charged dust grains and lead to remarkable structural and dynamical consequences [43,44,45,46,47,48,49,51,52].…”

Section: Introductionmentioning

confidence: 99%

On the wake structure in streaming complex plasmas

et al. 2012

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The theoretical description of complex (dusty) plasmas requires multiscale concepts that adequately incorporate the correlated interplay of streaming electrons and ions, neutrals and dust grains. Knowing the effective dust-dust interaction, the multiscale problem can be effectively reduced to a one-component plasma model of the dust subsystem. The goal of this paper is a systematic evaluation of the electrostatic potential distribution around a dust grain in the presence of a streaming plasma environment by means of two complementary approaches: (i) a high-precision computation of the dynamically screened Coulomb potential from the dynamic dielectric function and (ii) full 3D particle-in-cell simulations, which self-consistently include dynamical grain charging and nonlinear effects. The range of applicability of these two approaches is addressed.

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Section: Introductionmentioning

confidence: 99%

On the wake structure in streaming complex plasmas

et al. 2012

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“…The resulting positive space charge region attracts downstream grains, which thus favor an aligned position. The existence and characteristics of the attractive wake field has been studied by a number of analytical and numerical studies [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and experiments [22][23][24][25][26][27][28][29]. Based on systems consisting of two grains the wake field topology [27], the ion focus strength [23,25,26] and the influence of the confinement [24,27,30] have been studied.…”

Section: Introductionmentioning

confidence: 99%

Wake Formation and Wake Field Effects in Complex Plasmas

Block

Carstensen

Ludwig

et al. 2012

Contrib. Plasma Phys.

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The formation of wake fields downstream of an objects in flowing plasmas has strong implications on structure, stability and dynamics of complex plasmas. This paper aims at putting recent experimental investigations and different theoretical approaches on charging of dust grains, stability of dust grain arrangements and the dynamical properties of complex plasmas into perspective. Further, the combination of wake fields and grain confinement is discussed, which is the generic situation in complex plasmas. It is shown that in spherical traps the resulting competition of trap geometry and vertical alignment leads to a sophisticated mixture of nested shell and string order.

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“…However, a self-consistent numerical simulation of a nonideal multicomponent plasma in non-equilibrium is highly challenging due to the drastic differences in the time scales of the plasma constituents: electrons, positively charged ions, neutral atoms and negatively charged 'dust' grains of micrometer size. Utilizing the dynamical screening approach (DSA) this multiscale problem can, however, be effectively reduced by an approximate (statistical) description of the lighter plasma constituents by means of effective grain potentials [16][17][18][19][20][21][22][23] (see reviews [24,25] for more complete lists). The DSA allows for an accurate description of essential equilibrium and non-equilibrium plasma properties including plasma streaming induced wakefield oscillations, ion and electron thermal effects as well as collisional and Landau damping.…”

Section: Introductionmentioning

confidence: 99%

Ion-streaming induced order transition in three-dimensional dust clusters

Ludwig

Kählert

Bönitz

2012

Plasma Phys. Control. Fusion

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Abstract. Dust Dynamics Simulations utilizing a dynamical screening approach are performed to study the effect of ion-streaming on the self-organized structures in a three-dimensional spherically confined complex (dusty) plasma. Varying the Mach number M -the ratio of ion drift velocity to the sound velocity, the simulations reproduce the experimentally observed cluster configurations in the two limiting cases: at M = 0 strongly correlated crystalline structures consisting of nested spherical shells (Yukawa balls) and, for M ≥ 1, flow-aligned dust chains, respectively. In addition, our simulations reveal a discontinuous transition between these two limits. It is found that already a moderate ion drift velocity (M ≈ 0.1) destabilizes the highly ordered Yukawa balls and initiates an abrupt melting transition. The critical value of M is found to be independent of the cluster size.

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Dynamic nature of the ion wake in dusty plasmas

Cited by 5 publications

References 19 publications

On the wake structure in streaming complex plasmas

On the wake structure in streaming complex plasmas

Wake Formation and Wake Field Effects in Complex Plasmas

Ion-streaming induced order transition in three-dimensional dust clusters

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