Pattern Formation in a Complex Plasma in High Magnetic Fields

Schwabe, Mierk; Konopka, Uwe; Bandyopadhyay, P.; Morfill, G. E.

doi:10.1103/physrevlett.106.215004

Cited by 116 publications

(93 citation statements)

References 26 publications

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“…(1). Note that when there is a strong magnetic field, the dynamics of electrons and ions that account for the shielding may be completely changed [41], so that the interparticle interaction of 2D dusty plasmas may be more complicated. In this paper, we assume that the interparticle interaction is still the Yukawa interaction, as the zeroth order approximation.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…This attention is driven by experiments, which have only recently begun. There are at least three magnetized dusty plasma devices [41][42][43], which now, or soon will be, producing experimental data. The prospects for these experiments has motivated simulations, including [44][45][46][47], to study waves for 2D Yukawa liquids and solids under a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

et al. 2014

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Stochastic transport of a two-dimensional (2D) dusty plasma liquid with a perpendicular magnetic field is studied. Superdiffusion is found to occur especially at higher magnetic fields with β of order unity. Here, β = ωc/ω pd is the ratio of the cyclotron and plasma frequencies for dust particles. The mean-square displacement MSD = 4Dαt α is found to have an exponent α > 1, indicating superdiffusion, with α increasing monotonically to 1.1 as β increases to unity. The 2D Langevin molecular dynamics simulation used here also reveals that another indicator of random particle motion, the velocity autocorrelation function (VACF), has a dominant peak frequency ω peak that empirically obeys ω

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Section: Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

et al. 2014

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“…Several new phenomena have been observed in experiments with magnetic fields, including a slow rotation of the entire dust cloud [5][6][7][8][9], the spinning of dust particles [10], and complicated flow patterns [11]. In recent experiments with strong magnetic fields on the order of a few Tesla, sufficient to magnetize not only the electrons but the ions as well, filaments appeared in the discharge [12]. The dynamics of a dust particle pair also showed a pronounced response to magnetic fields of this magnitude [13].…”

mentioning

confidence: 99%

Streaming Complex Plasmas: Ion Susceptibility for a Partially Ionized Plasma in Parallel Electric and Magnetic Fields

Kählert

Joost

Ludwig

et al. 2016

Contrib. Plasma Phys.

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The density response function for streaming ions in homogeneous, parallel electric and magnetic fields is derived self-consistently from kinetic theory. Ion-neutral collisions are treated with the Bhatnagar-GrossKrook collision operator assuming a constant ion-neutral collision frequency. The result accounts for the nonMaxwellian distribution function of the ions and is valid in the full range from weak to strong magnetization. It provides the basis for various linear response calculations in the context of magnetized complex plasmas, where streaming ions interact with highly charged dust particles under the influence of a strong external magnetic field. Magnetic fields play an important role in plasma physics because they allow one to confine and manipulate charged particles externally. Plasma properties such as wave spectra, particle diffusion, heat conduction, or plasma instabilities can be strongly modified when the plasma is magnetized. Strong magnetic fields of several Tesla are not only encountered in magnetic confinement or magnetic liner inertial fusion experiments [1] but have also become of interest for complex plasmas research [2,3]. By adjusting the magnetic field strength it is possible to create plasma states where only the electrons, electrons and ions, or possibly all three charged particle species including the dust particles are magnetized [4]. Several new phenomena have been observed in experiments with magnetic fields, including a slow rotation of the entire dust cloud [5][6][7][8][9], the spinning of dust particles [10], and complicated flow patterns [11]. In recent experiments with strong magnetic fields on the order of a few Tesla, sufficient to magnetize not only the electrons but the ions as well, filaments appeared in the discharge [12]. The dynamics of a dust particle pair also showed a pronounced response to magnetic fields of this magnitude [13]. Experiments performed at the Magnetized Dusty Plasma Experiment (MDPX) at Auburn University [14] further demonstrate that ordered structures of a titanium mesh can be imposed on the dust particles under these conditions. Crystalline and strongly coupled fluid states [15,16] also occur naturally in dusty plasmas due to the strong Coulomb interaction between the grains. Even though the dust particles themselves are difficult to magnetize [17], their screened interaction, and thus, their collective behavior, can be affected significantly by an external magnetic field [18].Dusty plasma experiments are often confronted with ion flows due to electric fields, especially in the sheath region. They affect the charging of the dust grains [19], their mutual interaction due to the formation of wake potentials [20,21], and give rise to drag forces [22,23]. Under the influence of an electric field the ion velocity distribution may considerably differ from a displaced Maxwellian due to collisions with the neutral gas. Various phenomena related to the interaction between ions and dust particles have been shown to be crucially affected by the different dist...

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“…In their experiment, they have observed rotation of particles in the strongly coupled regime. Schwabe et al 16 have studied dusty plasma upto 2.3 T. They have noticed formation of spiral and filaments in presence of strong magnetic field. It is interesting to see the effect of moderate to strong magnetic field on various instabilities that arise in dusty plasma.…”

Section: Discussionmentioning

confidence: 99%

“…Diamagnetic drift is (15) where, ion-neutral collision frequency is ν in = n n σ in c i (16) while σ in is the ion-neutral collisional cross-section, and…”

Section: Appendix Amentioning

confidence: 99%

Dissipative drift instability in dusty plasma

Das

Baruah

2012

AIP Advances

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An investigation has been done on the very low-frequency electrostatic drift waves in a collisional dusty plasma. The dust density gradient is taken perpendicular to the magnetic field B0⃗, which causes the drift wave. In this case, low-frequency drift instabilities can be driven by E1⃗×B0⃗ and diamagnetic drifts, where E1⃗ is the perturbed electric field. Dust charge fluctuation is also taken into consideration for our study. The dust- neutral and ion-neutral collision terms have been included in equations of motion. It is seen that the low-frequency drift instability gets damped in such a system. Both dust charging and collision of plasma particles with the neutrals may be responsible for the damping of the wave. Both analytical and numerical techniques have been used while developing the theory

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Pattern Formation in a Complex Plasma in High Magnetic Fields

Cited by 116 publications

References 26 publications

Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

Streaming Complex Plasmas: Ion Susceptibility for a Partially Ionized Plasma in Parallel Electric and Magnetic Fields

Dissipative drift instability in dusty plasma

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