Kinetics of plasma flowing around two stationary dust grains

Владимиров, С. В.; Maĭorov, S. A.; Cramer, N. F.

doi:10.1103/physreve.67.016407

Cited by 62 publications

(37 citation statements)

References 30 publications

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“…The particle-in-cell (PIC) simulations [22] clearly demonstrated formation of the wake potential with the potential wells attracting the grains underneath. The ab initio three-dimensional molecular dynamics (MD) studies [23,25,26] also show the main features of the region of the strong ion focusing behind the grain for the case of a single grain as well as two grains aligned parallel and perpendicular to the ion flow. The binding energy resulting from the attractive wake potential created by two particles in streaming plasma [27] causes them to behave as a molecule [8,28].…”

Section: Introductionmentioning

confidence: 99%

Dust Particle Alignments in a Plasma Sheath

Samarian

Владимиров

2009

Contrib. Plasma Phys.

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Stability of vertical and horizontal arrangement of dust particles levitating in an rf sheath are discussed. Disruptions of particle arrangements are triggered by changing the discharge controlling parameters (pressure and peak-to-peak voltage) as well as by applying an additional bias to the confining electrode or by a laser beam. It is established that the most important controlling parameter is the relative strength of the horizontal and the vertical confinements. The clear hysteretic phenomena are observed for the horizontal-vertical-horizontal transition cycle. This hysteretic behavior can be attributed to the stabilizing (for the vertical alignment) and destabilizing (for the horizontal alignment) influence of the plasma wake potential. The width of the hysteresis increases with decreasing pressure thus indicating on stronger influence of the wake phenomena for low pressures. The horizontal alignment instability at the critical confinement can provide a new diagnostic tool for determining the wake parameters.

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Section: Introductionmentioning

confidence: 99%

Dust Particle Alignments in a Plasma Sheath

Samarian

Владимиров

2009

Contrib. Plasma Phys.

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“…In complex plasmas [1], dynamical screening and wake effects have been investigated in a large number of studies, including experimental [2,3,4,5] as well as theoretical [6,7,8,9,10] work. ‡ Computational approaches include first-principle molecular dynamics simulations [13,14,15], fluid codes [16,17] and particle-in-cell (PIC) simulations, e.g. [18,19,20,21].…”

Section: Introductionmentioning

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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“…Numerical simulations show that the ion focusing charge is mostly formed within the screening length behind the particle [13,14]. An attractive idea is to introduce a positive point-like effective wake charge q located at some small distance l beneath the particle within the Debye sphere.…”

Section: Binary Particle-wake Interactionsmentioning

confidence: 99%

The ‘dipole instability’ in complex plasmas and its role in plasma crystal melting

2006

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The 'dipole instability' in complex plasmas and its role in plasma crystal melting Using the dipole model for binary dust-dust interactions, the instability of wave perturbations in a one-dimensional particle string oriented along the ion flow (it highlights the major aspect of the multi-layer crystals) is considered. Longitudinal short wavelength perturbations are found to exist below a certain threshold value of gas pressure. They may act as a possible precursor of the melting transition observed in multi-layer plasma crystals. For different discharge conditions, the threshold of this 'dipole instability' is found to be in the range 10-150 Pa.

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Kinetics of plasma flowing around two stationary dust grains

Cited by 62 publications

References 30 publications

Dust Particle Alignments in a Plasma Sheath

Dust Particle Alignments in a Plasma Sheath

Screened Coulomb potential in a flowing magnetized plasma

The ‘dipole instability’ in complex plasmas and its role in plasma crystal melting

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