The Free Boundary Dust-Plasma Crystal

Khodataev, Ya. K.; Bingham, R.; Тараканов, В. П.; Tsytovich, V. N.; Morfill, G. E.

doi:10.1238/physica.topical.089a00095

Cited by 19 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The self-confinement occurs when the common potential well is formed trapping the dust cluster. This point of view is different from an argument that formation of boundary-free dust clusters is due to noncollective attraction (shadow forces) [9,10]. To the best of our knowledge, a self-consistent fully kinetic PIC modeling of 2D dust clusters was not carried out before.…”

Section: Discussionmentioning

confidence: 65%

“…It was demonstrated that the potential energy as a function of intergrain separation is reminiscent of a form of van der Waals curve with repulsion, equilibrium, and attraction regions [7,8]. The dust self-organization into a cluster in the absence of any external confining potential was predicted using molecular dynamics (MD) simulations [9]. It was shown theoretically that a stable 2D grain cluster can exist in plasmas without external confinement [10].…”

Section: Introductionmentioning

confidence: 99%

“…A boundary-free dust cluster was formed from a large central grain and a number of peripheral small grains (six times smaller). The attraction between the like-charged grains was explained as due to the noncollective shadow force of plasma particles [6,9,10]. The idea is that the flux and momentum of plasma particles on grains forming a cluster is larger on the outer side than that on the inner side creating the pressure confining the dust grains in the bulk plasma.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Self-confinement of finite dust clusters in isotropic plasmas

Miloshevsky

Hassanein

2012

Phys. Rev. E

View full text Add to dashboard Cite

Finite two-dimensional dust clusters are systems of a small number of charged grains. The self-confinement of dust clusters in isotropic plasmas is studied using the particle-in-cell method. The energetically favorable configurations of grains in plasma are found that are due to the kinetic effects of plasma ions and electrons. The self-confinement phenomenon is attributed to the change in the plasma composition within a dust cluster resulting in grain attraction mediated by plasma ions. This is a self-consistent state of a dust cluster in which grain's repulsion is compensated by the reduced charge and floating potential on grains, overlapped ion clouds, and depleted electrons within a cluster. The common potential well is formed trapping dust clusters in the confined state. These results provide both valuable insights and a different perspective to the classical view on the formation of boundary-free dust clusters in isotropic plasmas.

show abstract

Section: Discussionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self-confinement of finite dust clusters in isotropic plasmas

Miloshevsky

Hassanein

2012

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…It was later proved theoretically for two dust grains that the ion shielding not only partially reduces the repulsion between grains, but there is attraction leading to the selfconfinement [28,48,49]. The MD simulations were also performed reporting the boundary-free dust clusters [50]. It was shown theoretically that a stable 2D grain cluster can exist in plasmas without external confinement [51].…”

Section: Plasma Structure Within/behind a Dust Clustermentioning

confidence: 99%

Dynamics of isotropic and drifting plasmas in the vicinity and within two-dimensional finite dust clusters

Miloshevsky¹,

Hassanein²

2012

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

2D finite dust clusters are systems of small number of charged grains immersed in the plasma. The particle-in-cell (PIC) simulations are used to study the plasma structure, potential field and distributions of ion, electron and charge density within a dust cluster consisting of 19 grains in the absence and presence of a directed ion flow. In the isotropic plasma, an energetically stable configuration of this 2D finite dust cluster is found with overlapping ion clouds within the cluster's area. The supersonic ion flow transforms the common potential well to a shallow oval basin with the formation of an elongated potential hill behind the dust cluster. The common wake region with strong ion focusing is developed with the number density of ions significantly exceeding that in bulk plasma and within a cluster. The region within a dust cluster remains highly depleted of electrons even at supersonic ion flows. The charge on one of grains switches to a positive value. The kinetic-level PIC results provide insights into development of instabilities that can initiate the cluster reorganization, disordering and melting.

show abstract

“…In the past few decades, dusty plasmas have attracted much research attention because they play important roles in many phenomena in the astrophysical environments, the Earth's ionosphere, 2–7 as well as in industrial processes such as semiconductor device manufacturing, plasma etching, materials coating and modification, etc 1,6–9 . As a result, there has been much interest in the theory and applications of dusty plasmas, covering a large range of the physical parameters involved 10–35 . Since the electrons have much higher mobility, inelastic collisions between the electrons and dust grains are much more frequent than that of ions, so that the dust grains are usually highly negatively charged 10 …”

Section: Introductionmentioning

confidence: 99%

Evolution of charged grains in harmonic force field

Wang

Guan

2020

Contributions to Plasma Physics

View full text Add to dashboard Cite

Evolution of the spatial structure of the massive charged grains in the presence of weak linearly space-dependent external force in a dusty plasma is studied using molecular dynamics simulation. The interaction among the dust grains in the background electron-ion plasma is described by a modified Yukawa interaction potential that includes both repulsive and attractive ranges. Evolution of the initially homogeneously distributed dust grains is followed until a quasi-stationary state is reached. Even though the external force is radially highly asymmetric, the final configuration of the charged grains can be a circular crystal. Still driven by the external force, the grains in the crystal execute synchronized oscillations in the direction of the force. The time needed to reach the quasi-stationary state decreases with increase of the strength of the external force.

show abstract

The Free Boundary Dust-Plasma Crystal

Cited by 19 publications

References 0 publications

Self-confinement of finite dust clusters in isotropic plasmas

Self-confinement of finite dust clusters in isotropic plasmas

Dynamics of isotropic and drifting plasmas in the vicinity and within two-dimensional finite dust clusters

Evolution of charged grains in harmonic force field

Contact Info

Product

Resources

About