Neutral collisions in affecting diffusion and collective oscillation of magnetized complex plasma

Kong, Wei; Liu, Songfen; Yang, Fang; Shi, Feng; Wang, Yupei

doi:10.1063/1.5045700

Cited by 5 publications

(3 citation statements)

References 76 publications

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“…Time is scaled by the inverse nominal plasma frequency ω −1 pd of the unbounded system, where ω pd = (2Q 2 0 /(a 3 m 0 )) 1/2 . [48][49][50][51] Energy is normalized by U 0 = Q 2 0 /a. Q 0 and m 0 are the typical values in experiments of dusty plasma.…”

Section: Simulation Modelmentioning

confidence: 99%

“…The nanometer to millimeter charged dust particles behave in a gaseous-like, liquid-like, or solid-like state depending on the relative value of the kinetic energy to the effective interparticle potential energy. To obtain the generic properties of the system, such as transport, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] microscopic structure, [15][16][17][18][19][20][21][22][23][24][25][26] and collective oscillation, [27][28][29][30][31][32][33][34][35] a cluster composed of a finite number of particles is often employed in the simulation, and the boundary condition is assumed to be periodic. In that way, the unbounded system is simply regarded as infinite.…”

Section: Introductionmentioning

confidence: 99%

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Global dust density in two-dimensional complex plasma

Zhao 赵,

Liu 刘,

Kong 孔

et al. 2024

Chinese Phys. B

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The driven-dissipative Langevin dynamics simulation is used to produce a two-dimensional (2D) dense cloud, which is composed of charged dust particles being trapped in a quadratic potential. A 2D mesh grid is built to analyze the center-to-wall dust density. It is found that local dust density in the outer region relative to that of the inner region is more nonuniform, being consistent with the feature of quadratic potential. The dependences of the global dust density on equilibrium temperature, particle size, confinement strength, and confinement shape are investigated. It is found that the particle size, the confinement strength, and the confinement shape strongly affect the global dust density, while the equilibrium temperature plays a minor effect on it. In the direction where there is a stronger confinement, the dust density gradient is bigger.

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Section: Simulation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Global dust density in two-dimensional complex plasma

Zhao 赵,

Liu 刘,

Kong 孔

et al. 2024

Chinese Phys. B

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“…[29] Another promising area of research is to investigate the dynamics of dusty plasma under a magnetic field. [30,31] The structure of magnetized dusty plasmas can be computed through numerical methods. [32] An inclusive development of the presence of 3D particle crystalline structures has been studied but the investigation of OD-structures corresponding to Yukawa potential energy (PE) of SCCDPs is still an alternative goal of researchers through novel methods.…”

Section: Introductionmentioning

confidence: 99%

Crystalline order and disorder in dusty plasmas investigated by nonequilibrium molecular dynamics simulations*

Shahzad¹,

He²,

Ghani³

et al. 2019

Chinese Phys. B

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The particle structure of a complex system has been explored through a unique Evans's homogenous nonequilibrium molecular dynamics (HNEMD) simulation technique. The crystalline order–disorder structures (OD-structures) and the corresponding energies of three-dimensional (3D) nonideal complex systems (NICSs) have been measured over a wide range of plasma states (Γ, κ) for a body-centered cubic (BCC) structure. The projected technique provides accurate OD-structures with fast convergence and applicable to very small size effect for different temperatures ( ≡ 1 / Γ ) and constant force field ( F * ) values. The OD-structure obtained through HNEMD approach is found to be reasonable agreement and more reliable than those earlier identified by simulation approaches and experimental data of NICSs. New simulations of OD-structures show that dusty plasma remains in crystalline (strongly coupled) state at lower temperature and constant F * values, for the whole simulation runs. Our investigations show that the crystalline structure is changed and the particle structure switches from intermediate to disorder (nonideal gaseous) state with an increase of the system's temperature. It has been shown that the long range order shifts toward lower temperature with increasing * κ . The presented technique exhibits that the potential energy has a maximum value when the dusty plasma remains in crystalline states (low temperatures), which confirms earlier 3D simulation results.

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Dynamic structure factor of strongly coupled Yukawa plasmas with dissipation

Kählert

2019

Physics of Plasmas

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The dynamic structure factor (DSF) of the three-dimensional Yukawa one-component plasma is studied with molecular and Langevin dynamics simulations at moderate and strong coupling. The focus of the investigation is on the dependence of the DSF on the friction coefficient in different frequency and wavenumber regimes. At small to intermediate wavenumbers, frictional damping reduces the strength of the sound peak and leads to a red-shift of its frequency. In an intermediate range of friction coefficients, reducing the wavenumber leads to the vanishing of the sound peak at a finite frequency and the formation of a maximum at zero frequency. This is in contrast to simulations without friction, where the characteristic Rayleigh and Brillouin peaks are observed. The Rayleigh peak around zero frequency for systems without dissipation is generally weak. The simulations show that a small amount of friction can initially decrease its height even further before a strong single maximum is formed at strong damping. At large wavenumbers, the DSF of moderately coupled Yukawa plasmas with dissipation is well described by a single-particle model without interactions, provided frictional damping is taken into account.

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Neutral collisions in affecting diffusion and collective oscillation of magnetized complex plasma

Cited by 5 publications

References 76 publications

Global dust density in two-dimensional complex plasma

Global dust density in two-dimensional complex plasma

Crystalline order and disorder in dusty plasmas investigated by nonequilibrium molecular dynamics simulations*

Dynamic structure factor of strongly coupled Yukawa plasmas with dissipation

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