The onset of rotational motion of dusty plasma structures in strata of a glow discharge in a magnetic field

Дзлиева, Е. С.; Karasev, V. Yu.; Eikhvald, A. I.

doi:10.1134/s0030400x06030246

Cited by 26 publications

(17 citation statements)

References 18 publications

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“…In the presence of magnetic field (< 500 G), flows of electrons and ions influence the state of dusty medium and affect the dust cloud motion to rotate as a rigid body [30][31][32][33][34][35][36] . Application of strong magnetic field ( 4 Tesla) can magnetized the micron sized dust particles, which may gyrate in a plane perpendicular to the magnetic filed vector 37? .…”

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

2017

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“…In so doing, the dust structure levitating in the striation found itself in the region of convergent or divergent magnetic lines of force. However, no marked changes were observed in the dynamic behavior of dust structure under the effect of nonuniformity of magnetic field [10].…”

Section: Experiments Performed At the Institute Of Physics Of St Petmentioning

confidence: 91%

“…The series of experimental investigations [9][10][11][12][13] performed at the Institute of Physics of St. Petersburg University were aimed at studying the effect of axial magnetic field on dusty plasma structures in the striations of a glow dc discharge. The discharge was ignited in a vertically oriented tube with a radius of 1.1-1.6 cm; two coils generating a magnetic field parallel to the discharge axis were put on this tube.…”

Section: Experiments Performed At the Institute Of Physics Of St Petmentioning

confidence: 99%

“…One of the most interesting results of experiments with dusty plasma is the rotation of dusty plasma structures in a horizontal plane in the case of imposition of vertically oriented magnetic field [9,10,13,14,[17][18][19]. In so doing, the rotation velocity depends both on the magnitude of magnetic field and on the other parameters of the experiment.…”

Section: Introductionmentioning

confidence: 96%

“…In so doing, the rotation velocity depends both on the magnitude of magnetic field and on the other parameters of the experiment. In [10][11][12][13][14][18][19][20][21][22], the rotation is associated with the effect of ion drag forces. As to the azimuthal motion of ions, it is associated with their drift in crossed radial electric and axial magnetic fields and with the ion pressure gradient (diamagnetic current).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dusty Plasma Structures in Magnetic DC Discharges

D’yachkov¹,

Петров

Фортов

2009

Contrib. Plasma Phys.

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Key words Dusty (complex) plasmas, dusty plasmas structures, magnetic field, ion drag force, plasmas magnetization. PACS 52.27.LwResults are described of experiments in studying the effect of magnetic field on dusty plasma structures in dc discharges. The levitation of dust particles in vertically oriented dc discharges is possible either in the vicinity of the flat surface of cathode (or of special additional electrode) or in an electrostatic trap which forms at the striation head during the stratification of positive column. The most interesting one of the observed effects is that of rotation of dust structures in the case of imposition of axial magnetic field. The rotation occurs about the discharge axis of symmetry with a velocity which is a nonmonotonic function of magnetic force. An increase in the field may cause the variation of direction of rotation for the opposite. An interpretation is given of the mechanism of rotation and of the inversion of its velocity. The rotation of dust structures is caused by the tangential component of ion drag force. It is demonstrated that the inversion is, in the final analysis, associated with the competition between two mechanisms of plasma recombination, namely, those on the discharge tube wall and on the surface of dust particles. When the magnetic field increases, the latter mechanism becomes predominating as a result of magnetization of plasma, and the inversion of rotation occurs.

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The Dynamics of Dust Structures under Magnetic Field in Stratified Glow Discharge

Karasev

Дзлиева

Pavlov

et al. 2016

Contrib. Plasma Phys.

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A detailed research of mechanisms causing the rotation of dust structures formed in striations of the glow discharge in longitudinal magnetic field is presented. Literary data speak about sign‐variable dependence of angular velocity of dust structure on the magnetic field. The first done experiment proves that ion drag force is the reason of rotation with the negative projection of angular velocity on magnetic induction in small magnetic fields. The method of a variation of an ion flux in mixes of gases was used for the research. In the second experiment the gas rotation arising because of eddy electron current in the magnetic field was revealed by the method of probing of the discharge by dust particles. Estimates show that a prevalence of the mechanism of rotation of dust structures and correspondingly the direction of rotation depends both on discharge conditions and on the size of dust particles. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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The onset of rotational motion of dusty plasma structures in strata of a glow discharge in a magnetic field

Cited by 26 publications

References 18 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

Dusty Plasma Structures in Magnetic DC Discharges

The Dynamics of Dust Structures under Magnetic Field in Stratified Glow Discharge

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