Observations of imposed ordered structures in a dusty plasma at high magnetic field

Thomas, E.; Lynch, Brian; Konopka, Uwe; Merlino, R. L.; Rosenberg, M.

doi:10.1063/1.4914089

Cited by 74 publications

(40 citation statements)

References 38 publications

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“…The dynamics of a dust particle pair also showed a pronounced response to magnetic fields of this magnitude [13]. Experiments performed at the Magnetized Dusty Plasma Experiment (MDPX) at Auburn University [14] further demonstrate that ordered structures of a titanium mesh can be imposed on the dust particles under these conditions. Crystalline and strongly coupled fluid states [15,16] also occur naturally in dusty plasmas due to the strong Coulomb interaction between the grains.…”

mentioning

confidence: 97%

Streaming Complex Plasmas: Ion Susceptibility for a Partially Ionized Plasma in Parallel Electric and Magnetic Fields

Kählert

Joost

Ludwig

et al. 2016

Contrib. Plasma Phys.

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The density response function for streaming ions in homogeneous, parallel electric and magnetic fields is derived self-consistently from kinetic theory. Ion-neutral collisions are treated with the Bhatnagar-GrossKrook collision operator assuming a constant ion-neutral collision frequency. The result accounts for the nonMaxwellian distribution function of the ions and is valid in the full range from weak to strong magnetization. It provides the basis for various linear response calculations in the context of magnetized complex plasmas, where streaming ions interact with highly charged dust particles under the influence of a strong external magnetic field. Magnetic fields play an important role in plasma physics because they allow one to confine and manipulate charged particles externally. Plasma properties such as wave spectra, particle diffusion, heat conduction, or plasma instabilities can be strongly modified when the plasma is magnetized. Strong magnetic fields of several Tesla are not only encountered in magnetic confinement or magnetic liner inertial fusion experiments [1] but have also become of interest for complex plasmas research [2,3]. By adjusting the magnetic field strength it is possible to create plasma states where only the electrons, electrons and ions, or possibly all three charged particle species including the dust particles are magnetized [4]. Several new phenomena have been observed in experiments with magnetic fields, including a slow rotation of the entire dust cloud [5][6][7][8][9], the spinning of dust particles [10], and complicated flow patterns [11]. In recent experiments with strong magnetic fields on the order of a few Tesla, sufficient to magnetize not only the electrons but the ions as well, filaments appeared in the discharge [12]. The dynamics of a dust particle pair also showed a pronounced response to magnetic fields of this magnitude [13]. Experiments performed at the Magnetized Dusty Plasma Experiment (MDPX) at Auburn University [14] further demonstrate that ordered structures of a titanium mesh can be imposed on the dust particles under these conditions. Crystalline and strongly coupled fluid states [15,16] also occur naturally in dusty plasmas due to the strong Coulomb interaction between the grains. Even though the dust particles themselves are difficult to magnetize [17], their screened interaction, and thus, their collective behavior, can be affected significantly by an external magnetic field [18].Dusty plasma experiments are often confronted with ion flows due to electric fields, especially in the sheath region. They affect the charging of the dust grains [19], their mutual interaction due to the formation of wake potentials [20,21], and give rise to drag forces [22,23]. Under the influence of an electric field the ion velocity distribution may considerably differ from a displaced Maxwellian due to collisions with the neutral gas. Various phenomena related to the interaction between ions and dust particles have been shown to be crucially affected by the different dist...

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mentioning

confidence: 97%

Streaming Complex Plasmas: Ion Susceptibility for a Partially Ionized Plasma in Parallel Electric and Magnetic Fields

Kählert

Joost

Ludwig

et al. 2016

Contrib. Plasma Phys.

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“…Unlike the case of striation under identical conditions, the omega vector is directed opposite to the magnetic induction. The absolute value of the angular velocity is record‐breaking among all we know from the literature about structure rotation in strong magnetic fields …”

Section: Results and Discussion Of Fast Rotationmentioning

confidence: 99%

“…A number of studies have identified several physical phenomena associated with the dusty structures, their geometry, their dynamics in a magnetic field, and the ordering of particles. Nowadays, studies of dusty plasmas in magnetic fields continue, and the magnetic field magnitude range has been sufficiently widened . And the higher range of magnetic induction is a subject of certain interest of current research.…”

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

Дзлиева

D’yachkov

et al. 2019

Contributions to Plasma Physics

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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.

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“…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

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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Observations of imposed ordered structures in a dusty plasma at high magnetic field

Cited by 74 publications

References 38 publications

Streaming Complex Plasmas: Ion Susceptibility for a Partially Ionized Plasma in Parallel Electric and Magnetic Fields

Streaming Complex Plasmas: Ion Susceptibility for a Partially Ionized Plasma in Parallel Electric and Magnetic Fields

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

The effect of magnetic field on plasma particles in dusty plasma

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