Dust-acoustic shock waves: Effect of plasma density gradient

Xiao, Di; X., J.; Li, Yang‐Fang

doi:10.1063/1.1906087

Cited by 20 publications

(9 citation statements)

References 29 publications

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“…Figure 2 shows the time evolution of the potential , ion velocity V i , as well as ion density perturbation N i − N i0 with respect to X. The amplitude of the shock front increases as it propagates due to the effect of inhomogeneity [8], and an oscillatory tail begins to develop in the upstream side of the shock at the time T = 20. The oscillatory tail is not caused by the spurious numerical oscillations, but is due to the effect of dispersion of the steep shock front.…”

Section: Propagation In Hyperbolically Decreasing-density Plasmamentioning

confidence: 99%

“…As in the neutral gas case, nonlinear acoustic wave structures, such as shocks and solitons, can exist in such plasmas. This has attracted much theoretical investigation nowadays [5][6][7][8], and two types of acoustic waves were founded on different time scales. An ultra-low-frequency electrostatic acoustic-like mode called a dust-acoustic (DA) wave involving the dust hydrodynamics was first theoretically predicted by Rao et al [9].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of dust-ion-acoustic shock in inhomogeneous plasma by WENO scheme simulation

Yu¹,

Yang²,

X³

et al. 2007

J. Phys. D: Appl. Phys.

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Based on the hydrodynamic equations, the characteristics of nonlinear dust-ion-acoustic shock propagation in an inhomogeneous dusty plasma are numerically studied, by means of the fifth-order weighted essentially non-oscillatory (WENO) finite difference scheme. The inhomogeneous dust charging process for different plasma parameters has been incorporated and its effect on the shock propagation has been investigated. Comparisons of the shocks in the cases of different ion density distributions and different electron-to-ion density ratios are presented. The results show that the dust charging process results in wave damping and dissipation, and the decrease of the electron-to-ion density ratio leads to the increase of the speed, amplitude and width of the shock front. Moreover, the dispersion effect is dominant in the case of sharp shocks whereas the smooth shocks are easily dissipated.

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Section: Propagation In Hyperbolically Decreasing-density Plasmamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristics of dust-ion-acoustic shock in inhomogeneous plasma by WENO scheme simulation

Yu¹,

Yang²,

X³

et al. 2007

J. Phys. D: Appl. Phys.

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“…Additionally, studies like, void formation [14][15][16] , phase co-existence 29 , phase transition 7,30 , effect of spatial inhomogeneity of dust density on the dynamics of dust particles etc. cannot be investigated with few dust particles in the crystal 31,32 .…”

Section: Introductionmentioning

confidence: 99%

DPEx-II: A New Dusty Plasma Device Capable of Producing Large Sized DC Coulomb Crystals

Arumugam,

Bandyopadhyay,

Singh

et al. 2021

Preprint

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The creation of a spatially extended stable DC complex plasma crystal is a big experimental challenge and a topical area of research in the field of dusty plasmas. In this paper we describe a newly built and commissioned dusty plasma experimental device, DPEx-II, at the Institute for Plasma Research. The device can support the formation of large sized Coulomb crystals in a DC glow discharge plasma. The plasma in this L-shaped tabletop glass chamber is produced between a circular anode and a long tray shaped cathode. It is characterized with the help of various electrostatic probes over a range of discharge conditions. The dust particles are introduced by a dust dispenser to form a strongly coupled Coulomb crystal in the cathode sheath region. The unique asymmetric electrode configuration minimizes the heating of dust particles and facilitates the formation of crystalline structures with a maximum achievable dimension of 40 cm × 15 cm using this device. A larger crystal has numerous advantages over smaller ones, such as higher structural homogeneity, fewer defects, lower statistical errors due to finite size effects etc. A host of diagnostics tools are provided to characterize the Coulomb crystal. Results of a few initial experiments aimed at demonstrating the technical capabilities of the device and its potential for future dusty plasma research, are reported.

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“…However, in an experimental situation, the presence of density inhomogeneity is likely to be significant when one performs experiments in a large sized dusty plasma medium. In the literature there exist a very limited number of theoretical works devoted to the study of shock waves propagating in an inhomogeneous plasma medium 18,19 . They show that due to the presence of inhomogeneities in the plasma density, the relationships between amplitude, width and Mach number of shock waves deviate significantly from those obtained in a homogeneous medium.…”

Section: Introductionmentioning

confidence: 99%

Excitation of dust acoustic shock waves in an inhomogeneous dusty plasma

Arora,

Bandyopadhyay,

Hariprasad

et al. 2020

Preprint

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An experimental investigation of the propagation characteristics of shock waves in an inhomogeneous dusty plasma is carried out in the Dusty Plasma Experimental (DPEx) device. A homogeneous dusty plasma, made up of poly-dispersive kaolin particles, is initially formed in a DC glow discharge Argon plasma by maintaining a dynamic equilibrium of the pumping speed and the gas feeding rate. Later, an equilibrium density inhomogeneity in the dust fluid is created by introducing an imbalance in the original dynamic equilibrium. Non-linear wave structures are then excited in this inhomogeneous dusty plasma by a sudden compression in the dust fluid. These structures are identified as shock waves and their amplitude and width profiles are measured spatially. The amplitude of a shock structure is seen to increase whereas the width broadens as it propagates down a decreasing dust density profile. A modified-KdV-Burger equation is derived and used to provide a theoretical explanation of the results including the power law scaling of the changes in the amplitude and width as a function of the background density.

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Dust-acoustic shock waves: Effect of plasma density gradient

Cited by 20 publications

References 29 publications

Characteristics of dust-ion-acoustic shock in inhomogeneous plasma by WENO scheme simulation

Characteristics of dust-ion-acoustic shock in inhomogeneous plasma by WENO scheme simulation

DPEx-II: A New Dusty Plasma Device Capable of Producing Large Sized DC Coulomb Crystals

Excitation of dust acoustic shock waves in an inhomogeneous dusty plasma

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