On the possibility of phase transitions in dusty plasma structures in a glow discharge under the action of a magnetic field

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

doi:10.1134/s0030400x06110245

Cited by 6 publications

(10 citation statements)

References 16 publications

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“…It is convenient to identify phase transitions by the variations of correlation functions. Dzlieva et al [12] compare the pair correlation functions g(r) for the top and bottom horizontal cross sections of the structure at several values of magnetic field. It is demonstrated that the destruction of long-range order occurs in the top cross section when the magnetic field increases from zero to 160 G (≈ B 0 ).…”

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

confidence: 99%

“…The horizontal cross sections of dusty plasma structure, which are illuminated by the laser knife and have a thickness equal to one or two interparticle spacings, may be treated as two-dimensional structures. Analysis of pair correlation functions g(r) and of orientational correlation functions g 6 (r) for such cross sections revealed [12,13] that the increase in magnetic field from zero to 160 G causes the dust structure to change from an almost hexatic state to disordered gaseous state.…”

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

confidence: 99%

“…The transitional order parameter Δ/ξ and the orientational order parameter g 6 (0) were calculated for different horizontal cross sections and different values of magnetic field. The following inferences were made by the results of these calculations [12,13]. In high magnetic fields of 200-400 G, the structure is in the disordered state.…”

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

confidence: 99%

“…The variation of imposed magnetic field may cause internal transformation of the structure and the melting or crystallization of the dust component [9,12,13]. It is convenient to identify phase transitions by the variations of correlation functions.…”

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

confidence: 99%

“…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%

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dusty Plasma Structures in Magnetic DC Discharges

D’yachkov¹,

Петров

Фортов

2009

Contrib. Plasma Phys.

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10.1007/s11447-008-2018-8

2010

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Highly ordered three-dimensional dust structures are created in a striated glow discharge, and their horizontal cross-sectional images are analyzed. Calculated correlation functions, local correlation parameters, and corresponding approximations are used to classify the state of a structure according to the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) two-dimensional melting theory and a phenomenological approach. An orientational map based on an orientational parameter is proposed to expose domains in a cross section of a structure. It is shown that a plasma crystal is a polycrystal consisting of hexagonal domains (crystallites). Thermophoretic forces are used to create corners of various angles in the perimeter of the structure. Transition between hexagonal and square cell shapes is observed.

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Effect of neutral gas motion on the rotation of dust clusters in an axial magnetic field

et al. 2009

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Experiments are carried out to investigate the rotation of dust clusters in a radio-frequency plasma sheath with a vertical magnetic field. Our observations are in disagreement with the standard model, in which it was assumed that the neutral gas is at rest and that a steady rotation is attained when the ion-drag force is balanced by neutral friction. Here, we re-examine this basic assumption by carefully designed experiments. Our results suggest that the neutral gas is set into rotation by E×B induced ion flow through ion-neutral collisions and that the dust particles are advected by this flow. A hydrodynamic model is proposed to describe the rotation of the neutral gas and it can explain our observations.

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On the possibility of phase transitions in dusty plasma structures in a glow discharge under the action of a magnetic field

Cited by 6 publications

References 16 publications

Dusty Plasma Structures in Magnetic DC Discharges

Dusty Plasma Structures in Magnetic DC Discharges

10.1007/s11447-008-2018-8

Effect of neutral gas motion on the rotation of dust clusters in an axial magnetic field

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