Initial measurements of two- and three-dimensional ordering, waves, and plasma filamentation in the Magnetized Dusty Plasma Experiment

D’yachkov

et al. 2019

In this work, we, for the first time, present the experimental study of complex plasmas in glow discharge in the narrow region of the current channel under magnetic fields up to 104 G. We obtain the conditions for the existence and stability of structures under the whole range of the magnetic field. We could detect a record‐breaking rotation velocity of the dusty structure, reaching 15 rad/s. Measurements of the angular velocity behaviour under varied magnetic fields were performed. In order to characterize the geometry of the dusty structure as a function of the magnetic induction, the size and shape of the sections normal to the discharge axis were measured. The inter‐particle distance as another informative characteristic was fixed for structures under a whole range of the applied magnetic field. Based on the results of the mentioned observations, we propose a qualitative interpretation of the rotation variation with the magnetic field. This interpretation includes the model of mechanisms driving the rotation of the dusty structure.

Section: Results and Discussion Of Fast Rotationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Observation of the dynamics of the dust structure in a dust trap in a double electric layer in a magnetic field up to 10,000 G

Pavlov

D’yachkov

et al. 2019

“…Today, there are several works in which the dusty plasma was studied in strong magnetic field. Since, where authors reported about instability of the dc discharge and its influence on dusty plasma, there was a number of works performed in the conditions of rf discharge in magnetic field up to 2 × 10 4 G . In recent work, it was succeeded to create the dusty plasma in the conditions of the stratified glow discharge in a whole diapason of moderate magnetic field in neon.…”

Section: Introductionmentioning

confidence: 99%

The effect of magnetic field on plasma particles in dusty plasma

Karasev

D’yachkov

et al. 2019

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.

“…The magnetic field factor showed itself rather fruitful for research. Therefore, the range of applied magnetic field now migrates from a lower value region towards a higher one, and the experiments with magnetic field are carried out in all key discharge types.…”

Section: Introductionmentioning

confidence: 99%

Dusty plasma in the stratified glow discharge in moderate magnetic field

Pavlov

Novikov

et al. 2019

This article presents the experimental study of dust structures formed in striations of glow discharge in an external magnetic field of up to 104 G, which was created using a cryomagnet. A magnetic field classification based on probe theory is described. In moderate magnetic field, we obtained stable dust structures. The corresponding experimental setup and the experiment itself are described in detail. Special attention was paid to the influence of magnetic field on the change of the diameter and inter‐particle distance of dusty cloud. And, we also determined the dependence of angular velocity of dust rotation on magnetic induction.