Torus-shaped dust clouds trapped in a magnetized anodic plasma

Pilch, Iris; Reichstein, Torben; Piel, A.

doi:10.1063/1.3006085

Cited by 34 publications

(22 citation statements)

References 28 publications

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“…When the grains have larger displacements, or if particle tracking fails due to other considerations (such as high dust number density), particle image velocimetry (PIV) has been shown to be an effective method to measure the average velocity vector for small groups of particles within a dust cloud. [6][7][8][9][10] The dust component of the plasma observed within the experiment described in this study was found to be weakly coupled (fluid-like) with number densities on the order of 10 10 m À3 , making PIV the applicable image analysis technique for the system.…”

Section: Introductionmentioning

confidence: 97%

Observation and model of an ellipsoidally symmetric velocity space distribution in a weakly-coupled dusty plasma

Fisher

Thomas

2011

Physics of Plasmas

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The spatially resolved phase space distribution was measured for a dusty plasma system. Analysis of the velocity space component of the distributions revealed that the standard assumption of a spherically symmetric velocity space is not applicable to the observed system. The more general, ellipsoidally symmetric, multi-normal distribution function was applied to model the velocity space and is compared to the canonical spherically symmetric model.

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Section: Introductionmentioning

confidence: 97%

Observation and model of an ellipsoidally symmetric velocity space distribution in a weakly-coupled dusty plasma

Fisher

Thomas

2011

Physics of Plasmas

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“…In some of these experiments, magnetic field was applied. [7][8][9][10][11][12][13] In presence of magnetic field, the electric field inside the plasma induces an azimuthal (E Â B) rotation of ions. It causes the levitated dust particles to rotate in azimuthal direction at low pressures.…”

Section: Introductionmentioning

confidence: 99%

Observation of dust torus with poloidal rotation in direct current glow discharge plasma

et al. 2015

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Observation of dust cloud rotation in parallel-plate DC glow discharge plasma is reported here. The experiments are carried out at high pressures ($130 Pa) with a metallic ring placed on the lower electrode (cathode). The dust cloud rotates poloidally in the vertical plane near the cathode surface. This structure is continuous toroidally. Absence of magnetic field rules out the possibility of E Â B induced ion flow as the cause of dust rotation. The dust rotational structures exist even with water cooled cathode. Therefore, temperature gradient driven mechanisms, such as thermophoretic force, thermal creep flow, and free convection cannot be causing the observed dust rotation. Langmuir probe measurement reveals the existence of a sharp density gradient near the location of the rotating dust cloud. The gradient in the density, giving rise to a gradient in the ion drag force, has been identified as the principal cause behind the rotation of dust particles. V C 2015 AIP Publishing LLC. [http://dx.

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“…Finally, a new experiment by Pilch, et al has shown the formation of torus-shaped particle clouds produced by ion E × B flows in the anode spot of a glow discharge plasma with increasing magnetic field strength [136]. These studies illustrate that the presence of a magnetic field -even without a direct effect on the charged dust -can play a significant role in modifying the properties of dusty plasmas.…”

Section: Magnetic Field Effectsmentioning

confidence: 96%

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Thomas¹

2009

Contrib. Plasma Phys.

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The study of dusty plasmas in dc‐generated plasmas is a broad topic because of the wide variety of experimental configurations that fall under the category of “dc plasma source”. Experimental configurations such as the hot filament discharge, anodic (anode/cathode) discharge, and Q‐machine are all variations of the “dc plasma source” in which extensive studies of dusty plasmas have been performed. This paper will review dusty plasma investigations in these plasma sources. First, an introduction to each of these configurations and representative examples of each one will be given. This will be followed by a discussion of microparticle confinement in each of these configurations. Then, key results from dusty plasma investigations using these devices will be discussed. Specific emphasis will be placed on studies of: microparticle charging, particle cloud morphology, dust‐driven and dust‐modified waves, and strongly coupled effects. Some remarks on emerging research areas will be given at the end (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Torus-shaped dust clouds trapped in a magnetized anodic plasma

Cited by 34 publications

References 28 publications

Observation and model of an ellipsoidally symmetric velocity space distribution in a weakly-coupled dusty plasma

Observation and model of an ellipsoidally symmetric velocity space distribution in a weakly-coupled dusty plasma

Observation of dust torus with poloidal rotation in direct current glow discharge plasma

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

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