Collective Effects in Vortex Movements in Complex Plasmas

Schwabe, Mierk; Zhdanov, S. K.; Räth, C.; Graves, David B.; Thomas, Hubertus M.; Morfill, G. E.

doi:10.1103/physrevlett.112.115002

Cited by 59 publications

(46 citation statements)

References 58 publications

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“…10 The experimental observations also motivated the modeling of dust vortex 11,12 and numerical simulations where the dust vortex are recovered 13 along with the signatures of a vortex flow turbulence. 14 Keeping in view the above observations, it is quite relevant to consider situations where, a high enough dust particle population, localized in a limited volume by an effective confining potential, strongly interacts and comes to an equilibrium where particles uniformly fill the region of low potential, or the bottom of the potential well. At average kinetic energy of the dust particles either exceeding or comparable to the potential energy due to their mutual interaction, 15 this formation, in cases of isothermal dust flow with no significant variation in the density over the volume occupied by the dust cloud, can suitably be treated as an incompressible fluid for obtaining time independent flow distributions or for analyzing processes with the characteristic timescales longer than the inverse of dust acoustic frequency, x À1 d .…”

Section: Introductionmentioning

confidence: 98%

Dynamics of a confined dusty fluid in a sheared ion flow

2014

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Dynamics of an isothermally driven dust fluid is analyzed which is confined in an azimuthally symmetric cylindrical setup by an effective potential and is in equilibrium with an unconfined sheared flow of a streaming plasma. Cases are analyzed where the confining potential constitutes a barrier for the driven fluid, limiting its spatial extension and boundary velocity. The boundary effects entering the formulation are characterized by applying the appropriate boundary conditions and a range of solutions exhibiting single and multiple vortex are obtained. The equilibrium solutions considered in the cylindrical setup feature a transition from single to multiple vortex state of the driven flow. Effects of (i) the variation in dust viscosity, (ii) coupling between the driving and the driven fluid, and (iii) a friction determining the equilibrium dynamics of the driven system are characterized.

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Section: Introductionmentioning

confidence: 98%

Dynamics of a confined dusty fluid in a sheared ion flow

2014

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“…Furthermore, the dust density triggers decisive phenomena in dusty plasmas, such as selfexcited dust density waves, 9,10 vortex structures, [11][12][13] and phase transitions. 14 Besides the dust-dust interaction and dynamics, the dust density is also of high importance for the behavior of the usual plasma components (electrons and ions), since the presence of dust particles in turn affects the plasma in which the dust is confined.…”

Section: Introductionmentioning

confidence: 99%

Computer tomography of large dust clouds in complex plasmas

Killer

Himpel

Melzer

2014

Review of Scientific Instruments

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The dust density is a central parameter of a dusty plasma. Here, a tomography setup for the determination of the three-dimensionally resolved density distribution of spatially extended dust clouds is presented. The dust clouds consist of micron-sized particles confined in a radio frequency argon plasma, where they fill almost the entire discharge volume. First, a line-of-sight integrated dust density is obtained from extinction measurements, where the incident light from an LED panel is scattered and absorbed by the dust. Performing these extinction measurements from many different angles allows the reconstruction of the 3D dust density distribution, analogous to a computer tomography in medical applications.

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“…26 The vortices forming in laboratory dusty plasmas provide the opportunity to study these dynamic building blocks at the microscopic level of the system which is impossible in any other conventional fluid medium. 27,28 The rest of the paper is organised in the following way. A description of the experimental setup is given in Sec.…”

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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Collective Effects in Vortex Movements in Complex Plasmas

Cited by 59 publications

References 58 publications

Dynamics of a confined dusty fluid in a sheared ion flow

Dynamics of a confined dusty fluid in a sheared ion flow

Computer tomography of large dust clouds in complex plasmas

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

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