Sizing of particles levitating in a glow discharge dusty plasma

Дзлиева, Е. С.; Ermolenko, M. A.; Karasev, V. Yu.

doi:10.1134/s1063784212010070

Cited by 17 publications

(17 citation statements)

References 8 publications

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“…We succeeded in obtaining ultralong dust forma tions containing up to 30000 particles [15,18] above the lower wall of the tube by prolonged injection of particles into the discharge under the control of exper imental conditions. Both shape factor and the charac teristic size of particles in such 3D formation undergo changes.…”

Section: Resultsmentioning

confidence: 99%

“…We will consider the data obtained under optimal conditions in krypton and for comparison the data obtained in neon under similar conditions. In experiments, we detected the dust structure formed not in the strata, but above the lower wall of the chamber at the turn of the discharge current [15]. Analysis of the parameters of the dust structure will be carried out separately (see [18] and other pub lication).…”

Section: Resultsmentioning

confidence: 99%

“…We obtained the statistical distributions of extracted particles in two working media. Levitation of particles in dust traps located in the strata and above the lower wall of the discharge chamber near the bend in the current chan nel discovered recently in [15] is studied separately. Based on the dynamics of solitary dust particles, we analyzed levitation of particles with the size and shape determined in experiments.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the size and shape of polydisperse dust particles in a complex glow discharge plasma

2012

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The size and shape factor distribution of levitating particles is studied by the method of extraction of dust particles from the discharge chamber. Two dust traps existing in a glow discharge in the strata and above the lower wall of the tube near the bend in the current channel are investigated separately. It is found that the size distribution of polydisperse particles of an arbitrary shape is of the bimodal type due to simultaneous levitation of particles with two shape factors. Polydisperse spherical particles of any size exhibit levitation due to the sepa ration of particles over the wall thickness. For identical parameters of the discharge, the size of the particle in neon is slightly larger than in krypton; the particle size in the trap located in a stratum is substantially larger than the particle size in the trap above the wall of the discharge tube. Precision determination of the shape and size of particles makes it possible to estimate the electric field strength for dust traps. It is shown that the glow discharge can be used as a tool for separation of dust particles in a wide range of their sizes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the size and shape of polydisperse dust particles in a complex glow discharge plasma

2012

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“…The angular velocity of an isolated particle rotating under the action of the ion drag force and the drag under free flight conditions (Einstein force) [1,2] can be expressed in the form [13] (1)…”

Section: Resultsmentioning

confidence: 99%

“…In experiments with a complex plasma, it is impossible to obtain plasma crystals from particles of different sizes under identical discharge conditions; the dependence of the levitation of particles on their size was studied in detail in [13]. Hence, it was decided to use the technique of probing a plasma dust trap by particles with considerably different sizes.…”

Section: Introductionmentioning

confidence: 98%

Ion drag as a mechanism of plasma dust structure rotation in a strata in a magnetic field

et al. 2016

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In experiments on complex plasmas, afixed strata region in which the levitation of dust structures is observed is investigated using the method of probing by calibrated dust particles of different sizes in an applied magnetic field under elevated pressures. The measured azimuthal velocity of the probing particles corresponds to the action of the ion drag force for 4 μm-size particles and to the entrainment by the rotating gas owing to the electron vortex flow inside the strata for 1 μm-size particles. Extrapolation to pressures and magnetic fields in which the rotation inversion of dust structures is observed in experiments shows that the ion drag is the dominating force causing rotation with a negative projection of the angular velocity onto the magnetic induction.

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The effect of magnetic field on plasma particles in dusty plasma

Karasev

Дзлиева

D’yachkov

et al. 2019

Contributions to Plasma Physics

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In this work, we present the investigation of the formation features and internal structure of dust clouds created in plasma of glow discharge in the external magnetic field corresponding to a range of moderate and strong fields, at which the ion component is magnetized. The analysis of the plasma magnetization in the presence of dust components is carried out. We defined the values of magnetic induction at which the changes in dynamics of plasma particles in magnetic field in light inert gases are expected. The experimental setup was built in two versions. For the purpose of generating of magnetic field, the first setup was equipped with ordinary magnetic coils, and the second one included a superconducting solenoid. The discharge tubes, the main chambers where plasma was ignited and maintained in a glow discharge in lowered pressure, also have certain peculiarities, which we describe below. While using helium as a bulk gas, our study focused only on the dust trap in the region of narrowing discharge current. For neon, we used two traps: the striation trap and one just mentioned above placed in the narrowing of the discharge tube. As a result, the steady dust structures in a glow discharge under the magnetization of ions and electrons were obtained for the first time. Dust structures were rotated and tended to form a dust cluster and shell structure. A number of parameters of magnetization achieved in experiments were calculated.

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Sizing of particles levitating in a glow discharge dusty plasma

Cited by 17 publications

References 8 publications

Analysis of the size and shape of polydisperse dust particles in a complex glow discharge plasma

Analysis of the size and shape of polydisperse dust particles in a complex glow discharge plasma

Ion drag as a mechanism of plasma dust structure rotation in a strata in a magnetic field

The effect of magnetic field on plasma particles in dusty plasma

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