Drift wave instability in a radially bounded dusty magnetoplasma with parallel ion velocity shear

2012 ◽  
Vol 79 (1) ◽  
pp. 33-35
Author(s):  
P. K. SHUKLA ◽  
M. ROSENBERG
Keyword(s):  
Wave Equation ◽  
Fluid Model ◽  
Low Frequency ◽  
Velocity Shear ◽  
Charged Dust ◽  
Wave Instability ◽  
Linear Dispersion ◽  
Drift Wave ◽  
Ion Acoustic ◽  
Two Fluid Model

AbstractProperties of the coupled dust ion-acoustic drift wave instability in a radially bounded dusty magnetoplasma with an equilibrium sheared parallel ion (SPI) flow are investigated. By using the two-fluid model for the electrons and ions, a wave equation for the low-frequency coupled dust ion-acoustic drift waves in a bounded plasma with stationary charged dust grains is derived. The wave equation admits a linear dispersion relation, which exhibits that the radial boundary affects the growth rate of the coupled ion-acoustic drift wave instability which is excited by the SPI flow. The results should be relevant to dusty magnetoplasma experiments with an SPI flow.

scholarly journals Dispersive magnetized waves in the solar wind plasma

2010 ◽  
Vol 77 (3) ◽  
pp. 357-365 ◽  
Author(s):  
B. DASGUPTA ◽  
DASTGEER SHAIKH ◽  
P. K. SHUKLA
Keyword(s):  
Solar Wind ◽  
Dispersion Relation ◽  
Fluid Model ◽  
Phase Speed ◽  
Solar Wind Plasma ◽  
Small Scale ◽  
Linear Dispersion ◽  
Length Scales ◽  
Linear Dispersion Relation ◽  
Two Fluid Model

AbstractWe derive a generalized linear dispersion relation of waves in a strongly magnetized, compressible, homogeneous and isotropic quasi-neutral plasma. Starting from a two-fluid model, describing distinguishable electron and ion fluids, we obtain a six-order linear dispersion relation of magnetized waves that contains effects due to electron and ion inertia, finite plasma beta and angular dependence of phase speed. We investigate propagation characteristics of these magnetized waves in a regime where scale lengths are comparable with electron and ion inertial length scales. This regime corresponds essentially to the solar wind plasma, where length scales, comparable with ion cyclotron frequency, lead to dispersive effects. These scales in conjunction with linear waves present a great deal of challenges in understanding the high-frequency, small-scale dynamics of turbulent fluctuations in the solar wind plasma.

Analytical description of low-frequency electron density and temperature oscillations

1996 ◽  
Vol 55 (1) ◽  
pp. 25-34 ◽  
Author(s):  
P. Frank ◽  
M. Beckmann ◽  
G. Himmel
Keyword(s):  
Electron Density ◽  
Fluid Model ◽  
Low Frequency ◽  
Analytical Description ◽  
Frequency Instability ◽  
Temperature Gradients ◽  
Temperature Oscillations ◽  
Electron Density And Temperature ◽  
Two Fluid Model ◽  
The Magnetic Field

Low-frequency density and temperature oscillations (ω « νj, ωcj, where νj is the collision frequency with neutrals and ωcj is the cyclotron frequency; j = i, e) observed in magnetized radiofrequency-produced plasmas with electron density and temperature gradients across the magnetic field are analysed using a local two-fluid model. This model incorporates the electron energy equation. The resulting dispersion relation permits study of the parameter dependence of the complex angular wave frequency. Instability is found in the case where the election density and temperature gradients have opposite signs. This instability is classified as a low-frequency drift wave, and the criteria for its onset are obtained.

Propagation of Ion Acoustic Waves from and to a Spherical or Cylindrical Conductor

1972 ◽  
Vol 50 (5) ◽  
pp. 506-512 ◽  
Author(s):  
L. Schott
Keyword(s):  
Phase Velocity ◽  
Acoustic Waves ◽  
Fluid Model ◽  
Debye Length ◽  
Plasma Boundary ◽  
Ion Acoustic Waves ◽  
Ion Acoustic ◽  
Analytic Expressions ◽  
Consistent Solution ◽  
Two Fluid Model

Analytic expressions for the spatial variation of the phase velocity and amplitude of ion acoustic waves propagating radially through the plasma boundary layer at a conducting sphere or cylinder are derived using the two-fluid model. The Debye length is assumed to be small compared with any relevant dimension of the problem and the wavelength small compared with the radius of the conductor. The limits of ion mean free paths small and large compared with the radius of the sphere are considered. In the cylindrical case only the collisionless limit has a self-consistent solution. It is found that both the converging and the diverging waves are damped and that the phase velocity of the wave is approximately equal to the sum of the ion acoustic velocity in a homogeneous plasma and the ion drift velocity. The contribution of Landau damping to the total damping is estimated.

Density Wave Instability Verification of CFD Two-Fluid Model

2020 ◽  
Vol 194 (8-9) ◽  
pp. 665-675
Author(s):  
S. L. Sharma ◽  
J. R. Buchanan ◽  
M. A. Lopez de Bertodano
Keyword(s):  
Fluid Model ◽  
Density Wave ◽  
Wave Instability ◽  
Two Fluid Model ◽  
Two Fluid

Electrostatic drift-wave instability in a nonuniform quantum magnetoplasma with parallel velocity shear flows

2010 ◽  
Vol 17 (10) ◽  
pp. 102705 ◽  
Author(s):  
Sabeen Tariq ◽  
Arshad. M. Mirza ◽  
W. Masood
Keyword(s):  
Shear Flows ◽  
Velocity Shear ◽  
Wave Instability ◽  
Drift Wave

scholarly journals Interactions of fast ions with graphene

2009 ◽  
Vol 63 (3) ◽  
pp. 151-157 ◽  
Author(s):  
Ivan Radovic ◽  
Ljupco Hadzievski ◽  
Natasa Bibic ◽  
Zoran Miskovic
Keyword(s):  
Fluid Model ◽  
Electron Gas ◽  
Low Frequency ◽  
Image Force ◽  
Numerical Results ◽  
Fast Ions ◽  
Single Sheet ◽  
Two Fluid Model ◽  
The One ◽  
Two Fluid

In this work, we study the interactions of fast ions with graphene describing the excitations of the electron gas in graphene by a two-dimensional (2D) hydrodynamic model (one-fluid and two-fluid model). The two-fluid model reproduces qualitatively the split of plasmon dispersions into the low-frequency p-electron branch and the high-frequency s+p-electron branch. We calculate the stopping force and the image force on an ion moving parallel to a single sheet of graphene. Numerical results show that the presence of the low-energy, quasiacoustic plasmon in the two-fluid model gives rise to resonant features at low velocities around its 'acoustic' speed, which are not seen in the one-fluid model. The two models give virtually indistinguishable results for both forces at high speeds. Marked differences between the two models in the values of image forces at low speeds can be seen. Numerical results show that the magnitudes of both the stopping and image forces exhibit typical resonance-shaped velocity dependencies, with the peak positions moving to higher velocities for higher distances and with the overall magnitudes decreasing sharply with increasing distances. The second order corrections are found to be small, as expected for fast ions outside the electron gas, but their relative magnitudes should be easily discernible in experiments on ion grazing scattering from graphene. One notices effects which are similar to those obtained earlier for proton channeling in carbon nanotubes.

Modified Zakharov–Kuznetsov equation for a non-uniform electron–positron–ion magnetoplasma with kappa-distributed electrons

2015 ◽  
Vol 81 (5) ◽  
Author(s):  
Ali Ahmad ◽  
W. Masood
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Low Frequency ◽  
Larmor Frequency ◽  
Magnetized Plasma ◽  
Intense Laser ◽  
Linear Dispersion ◽  
Electron Positron ◽  
Solitary Structures ◽  
Ion Acoustic

We investigate the low-frequency (by comparison with the ion Larmor frequency) electrostatic solitary structures in a spatially non-uniform electron–positron–ion (e–p–i) magnetoplasma with non-Maxwellian electrons. A linear dispersion relation for the obliquely propagating ion acoustic drift wave is derived and it is shown that the non-Maxwellian electron population modifies the dispersion characteristics of the wave under consideration. We also carry out a nonlinear analysis and derive the modified Zakharov–Kuznetsov (MZK) equation for the coupled drift acoustic wave in a non-uniform magnetized plasma. We highlight the differences between the MZK equation and its homogeneous counterpart. We also find the solution of the MZK equation using the tangent hyperbolic method. It is observed that the electron spectral index ${\it\kappa}$, positron concentration, and propagation angle ${\it\alpha}$ alter the structure of the ion acoustic drift solitary waves. The results obtained in this paper may be beneficial to understanding the propagation characteristics of electrostatic drift solitary structures in the interstellar medium and in laboratory experiments where electron–positron plasmas have recently been created by impinging ultra-intense laser pulses on a solid density target at the Lawrence Livermore National Laboratory (LLNL).

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