On the influence of wakefields on three-dimensional particle arrangements

Kroll, M.; Schablinski, Jan; Block, Dietmar; Piel, A.

doi:10.1063/1.3276741

Cited by 61 publications

(62 citation statements)

References 35 publications

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“…In the plasma sheath region, where strong electric fields are present, the grains form vertically aligned 'dust molecules' and, with the help of a confining potential, long particle strings can be created, e.g. [5,6,7]. The vertical alignment of particles is not explainable with a purely repulsive grain interaction.…”

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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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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“…in a Yukawa system. In dusty plasma experiments the friction coefficient can be within a wide range [10,14,37], depending on the gas pressure. We thus expect that it should be possible to observe the modes in experiments.…”

Section: Influence Of Dampingmentioning

confidence: 99%

Collective excitations of a spherically confined Yukawa plasma

Kählert

Bönitz

2011

Phys. Rev. E

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The results of a recent fluid theory for the multipole modes of a Yukawa plasma in a spherical confinement [H. Kählert and M. Bonitz, Phys. Rev. E 82, 036407 (2010)] are compared with molecular dynamics simulations and the exact N -particle eigenmodes in the crystalline phase. Simulations confirm the existence of high order modes found in cold fluid theory. We investigate the influence of screening, coupling and friction on the mode spectra in detail. Good agreement between theory and simulation is found for weak to moderate screening and low order modes. The relations between the breathing mode in the fluid theory, simulation and the crystal eigenmode are investigated in further detail.

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“…The (linear response) theory of Lampe et al [19] for like particles in confining wells indicates that anharmonic (steep wall) well structure is required but can then explain oblique alignment. Recently Kroll et al [20] have observed return transitions to vertical alignment from metastable oblique alignment states that again have angles no less than 45 o for like particles. Hebner and Riley (2003-4) [21,22], in contrast, observed the dynamics of two interacting particles at low neutral pressure, moving in one horizontal dimension at almost fixed (but different) heights determined by the various different sizes of the particles.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear collisionless plasma wakes of small particles

Hutchinson

2011

Physics of Plasmas

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The wake behind a spherical particle smaller than the Debye length (λ De ) in flowing plasma is calculated using a particle-in-cell code. The results with different magnitudes of charge reveal substantial non-linear effects down to values that for a floating particle would correspond to a particle radius approximately 10 −2 λ De . The peak potential in the oscillatory wake structure is strongly suppressed by non-linearity, never exceeding approximately 0.4 times the unperturbed ion energy. By contrast, the density peak arising from ion focusing can be many times the ambient. Strong heating of the ions occurs in the non-linear regime. Direct ion absorption by the particle is not important for the far wake unless the radius exceeds 10 −1 λ De , and is therefore never significant (for the far wake) in the linear regime. Reasonable agreement with full-scale linear-response calculations are obtained in the linear regime. The wake wavelength is confirmed and an explanation, in terms of the conical potential structure, is proposed for experimentallyobserved oblique alignment of different-sized grains.

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On the influence of wakefields on three-dimensional particle arrangements

Cited by 61 publications

References 35 publications

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

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

Collective excitations of a spherically confined Yukawa plasma

Nonlinear collisionless plasma wakes of small particles

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