Rotation of coulomb crystals in a magnetized inductively coupled complex plasma

Cheung, F. M. H.; Prior, N. J.; Mitchell, L.W.; Samarian, A. A.; James, B. W.

doi:10.1109/tps.2003.809283

Cited by 20 publications

(12 citation statements)

References 31 publications

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“…The vortex or rotational motion of dust particles is widely studied in various dusty plasma systems. The spontaneous rotation of dust grains 14 , two-dimensional (2D) dust vortex flow 15 , cluster rotation 16 poloidal rotation of dust grains with toroidal symmetry 17 , and wave a) Electronic mail: mangilal@ipr.res.in motion along with vortex motion [18][19][20] are observed in unmagnetized plasmas world wide. The horizontal and vertical vortex motion of dust grains in the presence of an auxiliary electrode near the levitated dust cloud in capacitive coupled plasma is also reported by Samarian et al 21 and Law et al 22 .…”

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confidence: 99%

Experimental observation of self excited co-rotating multiple vortices in a dusty plasma with inhomogeneous plasma background

2017

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We report an experimental observation of multiple co-rotating vortices in a extended dust column in the background of non-uniform diffused plasma. Inductively coupled RF discharge is initiated in the background of argon gas in the source region which later found to diffuse in the main experimental chamber. A secondary DC glow discharge plasma is produced to introduce the dust particles into the plasma. These micron sized poly-disperse dust particles get charged in the plasma environment and transported by the ambipolar electric field of the diffused plasma and found to confine in the potential well, where the resultant electric field of the diffused plasma (ambipolar E-field) and glass wall charging (sheath E-field) hold the micron sized particles against the gravity. Multiple co-rotating (anti-clockwise) dust vortices are observed in the dust cloud for a particular discharge condition. The transition from multiple to single dust vortex is observed when input RF power is lowered. Occurrence of these vortices are explained on the basis of the charge gradient of dust particles which is orthogonal to the ion drag force. The charge gradient is a consequence of the plasma inhomogeneity along the dust cloud length. The detailed nature and the reason for multiple vortices are still under investigation through further experiments, however, preliminary qualitative understanding is discussed based on characteristic scale length of dust vortex. There is a characteristic size of the vortex in the dusty plasma so that multiple vortices is possible to form in the extended dusty plasma with inhomogeneous plasma background. The experimental results on the vortex motion of particles are compared with a theoretical model and found some agreement.

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confidence: 99%

Experimental observation of self excited co-rotating multiple vortices in a dusty plasma with inhomogeneous plasma background

2017

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“…The effects of an ambient magnetic field are expected to be moderate on the dust as long as the magnetic field is not strong enough to magnetize the dust particles. Recent experimental studies have however shown that in a weakly magnetized plasma where only electrons are magnetized, dust motion can have finite effects of the magnetic field via magnetization of electrons [4][5][6][7]. This paper presents a hydrodynamic formulation for the dust vortex flow accounting for effects of weak magnetization as observed and quantified in these recent experiments.…”

Section: Introductionmentioning

confidence: 93%

“…Dust Vortex flow have also been observed un-der external forces [1,[16][17][18][19]. Recently, rotating dust structures have also been observed in weakly magnetized plasmas [4][5][6][7] where dust dynamics is again interpreted as governed by the non-conservative forces like, ion drag and neutrals flow.…”

Section: Introductionmentioning

confidence: 99%

Dust vortex flow analysis in weakly magnetized plasma

Kumar,

Sharma

2020

Preprint

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Analysis of driven dust vortex flow is presented in a weakly magnetized plasma. The 2D hydrodynamic model is applied to the confined dust cloud in a non-uniform magnetic field in order to recover the dust vortex flow driven in a conservative force field setup, in absence of any non-conservative fields or dust charge variation. Although the time independent electric and magnetic fields included in the analysis provide conservative forcing mechanisms, when the a drift based mechanism, recently observed in a dusty plasma experiment by [M. Puttscher and A. Melzer, Physics of Plasmas, 21,123704(2014)] is considered, the dust vortex flow solutions are shown to be recovered. We have examined the case where purely ambipolar electric field, generated by polarization produced by electron E × B drift, drives the dust flow. A sheared E × B drift flow is facilitated by the magnetic field gradient, driving the vortex flow in the absence of ion drag. The analytical stream-function solutions have been analyzed with varying magnetic field strength, its gradient and kinematic viscosity of the dust fluid. The effect of B field gradient is analyzed which contrasts that of E field gradient present in the plasma sheath.

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“…In particular, the magnetized plasma is anisotropic, responding differently to forces, which are parallel and perpendicular to the direction of the magnetic field. Therefore, it is not a surprise, that the dust particles under the influence of the magnetic field in various types of laboratory complex plasmas have been intensely studied through the last decade [2][3][4][5][6][7][8][9][10][11][12][13][14] and future experiments are planned [15].…”

Section: Introductionmentioning

confidence: 99%

Differential Dust Disk Rotation in a Complex Plasma with Magnetic Field

Saitou

Samarian

Ishihara

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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Collective motion of charged dust particles, levitated in a disk and a ring that forms in cylindrical electrodeless RF plasma with an axial magnetic field, was investigated experimentally. The measured angular velocities of the disk and the ring are less than 10 rad/s and less than 8 rad/s, respectively. We found that the angular velocity strongly depends on the gas pressure and the strength of the magnetic field while the RF power does not significantly influence the rotation of the dust structure.

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Rotation of coulomb crystals in a magnetized inductively coupled complex plasma

Cited by 20 publications

References 31 publications

Experimental observation of self excited co-rotating multiple vortices in a dusty plasma with inhomogeneous plasma background

Experimental observation of self excited co-rotating multiple vortices in a dusty plasma with inhomogeneous plasma background

Dust vortex flow analysis in weakly magnetized plasma

Differential Dust Disk Rotation in a Complex Plasma with Magnetic Field

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