scholarly journals Plasma Diagnostic Methods: Test Charge Response in Lorentzian Dusty Plasmas

2020 ◽  
Author(s):  
Shahid Ali ◽  
Yas Al-Hadeethi
Keyword(s):  
Dusty Plasmas ◽  
Diagnostic Methods ◽  
Charged Dust ◽  
Dust Grains ◽  
Plasma Diagnostic ◽  
Acoustic Oscillations ◽  
Plasma Parameters ◽  
Charge Potential ◽  
Test Charge ◽  
Electrons And Ions

Different plasma diagnostic methods are briefly discussed, and the framework of a test charge technique is effectively used as diagnostic tool for investigating interaction potentials in Lorentzian plasma, whose constituents are the superthermal electrons and ions with negatively charged dust grains. Applying the space-time Fourier transformations to the linearized coupled Vlasov-Poisson equations, a test charge potential is derived with a modified response function due to energetic ions and electrons. For a test charge moving much slower than the dust-thermal speed, there appears a short-range Debye-Hückel (DH) potential decaying exponentially with distance and a long-range far-field (FF) potential as the inverse cube of the distance from test charge. The FF potentials exhibit more localized shielding curves for low-Kappas, and smaller effective shielding length is observed in dusty plasma compared to electron-ion plasma. However, a wakefield (WF) potential is formed behind the test charge when it resonates with dust-acoustic oscillations, whereas a fast moving test charge leads to the Coulomb potential having no shielding around. It is revealed that superthermality and plasma parameters significantly alter the DH, FF, and WF potentials in space plasmas of Saturn’s E-ring, where power-law distributions can be used for energetic electrons and ions in contrast to Maxwellian dust grains.

The Cross-Field Acceleration of Charged Dust Grains by the Ponderomotive Force of Compressional Waves in Dusty Plasmas

2005 ◽  
Vol 629 (2) ◽  
pp. L93-L95 ◽  
Author(s):  
P. K. Shukla ◽  
L. Stenflo
Keyword(s):  
Ponderomotive Force ◽  
Dusty Plasmas ◽  
Charged Dust ◽  
Dust Grains ◽  
Compressional Waves ◽  
The Cross

Small-amplitude shock waves and double layers in dusty plasmas with opposite polarity charged dust grains

2017 ◽  
Vol 43 (6) ◽  
pp. 668-676
Author(s):  
M. Amina ◽  
S. A. Ema ◽  
A. A. Mamun
Keyword(s):  
Shock Waves ◽  
Small Amplitude ◽  
Dusty Plasmas ◽  
Opposite Polarity ◽  
Double Layers ◽  
Charged Dust ◽  
Dust Grains

Time-dependent non-planar dust-acoustic solitary and shock waves in strongly coupled adiabatic dusty plasma

2012 ◽  
Vol 79 (3) ◽  
pp. 249-255 ◽  
Author(s):  
M. S. RAHMAN ◽  
B. SHIKHA ◽  
A. A. MAMUN
Keyword(s):  
Shock Waves ◽  
Dusty Plasmas ◽  
Time Dependent ◽  
Planar Geometry ◽  
Charged Dust ◽  
Dust Grains ◽  
Strongly Coupled ◽  
And Shock Waves ◽  
Dust Acoustic ◽  
Solitary And Shock Waves

AbstractTime-dependent cylindrical and spherical dust-acoustic (DA) solitary and shock waves propagating in a strongly coupled dusty plasmas (containing strongly correlated negatively charged dust grains and weakly correlated adiabatic electrons and ions) are investigated. It is shown that cylindrical and spherical DA solitary and shock waves exist with negative potential, and that the strong correlation between the charged dust grains is a source of dissipation, and is responsible for the formation of cylindrical or spherical DA shock structures. It is also shown that the effects of a non-planar geometry (cylindrical and spherical) significantly modify the basic features (e.g. amplitude, width, speed, etc.) of DA solitary and shock waves. The implications of our results in laboratory experiments are briefly discussed.

scholarly journals Dust-Ion-Acoustic Rogue Waves in a Dusty Plasma Having Super-Thermal Electrons

Gases ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 106-116
Author(s):  
Akib Al Noman ◽  
Md Khairul Islam ◽  
Mehedi Hassan ◽  
Subrata Banik ◽  
Nure Alam Chowdhury ◽  
...  
Keyword(s):  
Dusty Plasma ◽  
Modulational Instability ◽  
Rogue Waves ◽  
Dusty Plasmas ◽  
Charged Dust ◽  
Dust Grains ◽  
Ion Temperature ◽  
Ion Acoustic ◽  
Kappa Distributed Electrons ◽  
Dia Waves

The standard nonlinear Schrödinger Equation (NLSE) is one of the elegant equations to find detailed information about the modulational instability criteria of dust-ion-acoustic (DIA) waves and associated DIA rogue waves (DIARWs) in a three-component dusty plasma medium with inertialess super-thermal kappa distributed electrons, and inertial warm positive ions and negative dust grains. It can be seen that the plasma system supports both fast and slow DIA modes under consideration of inertial warm ions along with inertial negatively charged dust grains. It is also found that the modulationally stable parametric regime decreases with κ. The numerical analysis has also shown that the amplitude of the first and second-order DIARWs decreases with ion temperature. These results are to be considered the cornerstone for explaining the real puzzles in space and laboratory dusty plasmas.

Stimulated Raman, Brillouin and dust–Brillouin scattering in dusty plasmas

1998 ◽  
Vol 59 (2) ◽  
pp. 343-365
Author(s):  
R. GUERRA ◽  
J. T. MENDONÇA ◽  
P. K. SHUKLA
Keyword(s):  
Brillouin Scattering ◽  
Debye Length ◽  
Dusty Plasmas ◽  
Charge Fluctuation ◽  
Dust Grains ◽  
Stimulated Scattering ◽  
Coulomb Collisions ◽  
Average Spacing ◽  
Dust Charge ◽  
Electrons And Ions

Stimulated scatterings of large-amplitude electromagnetic waves by Langmuir, dust–ion-acoustic and dust-acoustic waves in unmagnetized dusty plasmas are investigated by employing the standard methods of nonlinear three-wave interactions and by incorporating the effects of grain-charge fluctuations, collisions of electrons and ions with dust grains, the plasma drag on a dust grain (for the case of the dust-acoustic wave) and the dependence of the average dust charge on the dusty plasma parameters. Distinction is made between the charging collisions, when electrons and ions are accumulated onto the grain surface; and Coulomb collisions, when electrons and ions are simply deflected from the grain surface. We investigate the regimes for which Coulomb collisions can be treated under the small-angle-deflection approximation. If the intergrain average spacing is equal to or smaller than the Debye length, the collision frequencies of plasma species with dust grains can be much larger than any collision frequency of the plasma species amongst themselves. In the case of Brillouin stimulated scattering, other important contributions to damping come from Landau and dust-charge fluctuation damping. In the case of dust–Brillouin stimulated scattering, the most important contribution to damping comes from dust-charge fluctuation (if the intergrain average spacing is equal to or smaller than the Debye length) and plasma drag on the dust particles (if the intergrain average spacing is larger than the Debye length). We derive the instability thresholds as a function of the density of the dust grains. Because of the inclusion of the new effects, in both Raman and Brillouin scatterings it is found that the instability threshold powers are drastically increased relative to the dust-free case. In the case of dust–Brillouin scattering, a minimum for the threshold power is found in the transition region between ‘dusty’ and ‘dust-in’ plasma. Growth rates near thresholds are also discussed.

Plasma absorption effects on collisions of positively charged dust grains in dusty plasmas

2011 ◽  
Vol 109 (5) ◽  
pp. 056104 ◽  
Author(s):  
Young-Dae Jung ◽  
Woo-Pyo Hong
Keyword(s):  
Dusty Plasmas ◽  
Charged Dust ◽  
Dust Grains ◽  
Plasma Absorption ◽  
Positively Charged

scholarly journals Polarization-force-induced dust grain acceleration and intrinsic magnetization of dusty plasmas

2010 ◽  
Vol 76 (5) ◽  
pp. 677-680 ◽  
Author(s):  
N. SHUKLA ◽  
P. K. SHUKLA
Keyword(s):  
Magnetic Fields ◽  
Dusty Plasma ◽  
Dusty Plasmas ◽  
Charged Dust ◽  
Dust Grains ◽  
Polarization Force ◽  
Dust Grain

AbstractIt is shown that the polarization force, arising from interactions between thermal ions and highly charged dust grains, can accelerate charged dust grains and can also create spontaneous magnetic fields in a quasi-neutral dusty plasma. The present results are relevant for understanding the origin of dust grain acceleration and the generation of spontaneous magnetic fields in cosmic dusty plasmas.

Self-similar expansion of adiabatic electronegative dusty plasma

2017 ◽  
Vol 83 (6) ◽  
Author(s):  
M. Shahmansouri ◽  
A. Bemooni ◽  
A. A. Mamun
Keyword(s):  
Dusty Plasma ◽  
Dusty Plasmas ◽  
Adiabatic Index ◽  
The Self ◽  
Charged Dust ◽  
Plasma Expansion ◽  
Plasma Parameters ◽  
Dust Temperature ◽  
Self Similar ◽  
Expansion Of Space

The self-similar expansion of an adiabatic electronegative dusty plasma (consisting of inertialess adiabatic electrons, inertialess adiabatic ions and inertial adiabatic negatively charged dust fluids) is theoretically investigated by employing the self-similar approach. It is found that the effects of the plasma adiabaticity (represented by the adiabatic index $\unicode[STIX]{x1D6FE}$) and dusty plasma parameters (determined by dust temperature and initial dust population) significantly modify the nature of the plasma expansion. The implications of our results are expected to play an important role in understanding the physics of the expansion of space and laboratory electronegative dusty plasmas.

Theory of Mach Cones in Magnetized Dusty Plasmas with Strongly Correlated Charged Dust Grains

2004 ◽  
Vol 92 (9) ◽  
Author(s):  
A. A. Mamun ◽  
P. K. Shukla ◽  
G. E. Morfill
Keyword(s):  
Dusty Plasmas ◽  
Charged Dust ◽  
Strongly Correlated ◽  
Dust Grains ◽  
Mach Cones

The use of magneto-acoustic oscillations as a plama diagnostic technique

1975 ◽  
Vol 14 (3) ◽  
pp. 373-387 ◽  
Author(s):  
J. J. B. Frommelt ◽  
Ieuan R. Jones
Keyword(s):  
Diagnostic Technique ◽  
Theoretical Description ◽  
Magnetized Plasma ◽  
Plasma Diagnostic ◽  
Acoustic Oscillations ◽  
Radial Profiles ◽  
Free Parameters ◽  
Field Disturbance ◽  
Neutral Cross Section ◽  
Afterglow Plasma

A theoretical and experimental investigation of the forced radial magnetoacoustic oscillations of a magnetized plasma column is presented in this paper. Forced magneto-acoustic oscillations of a magnetized argon afterglow plasma are generated continuously by passing an RF current through a solenoid wrapped around the discharge tube. The radial variation of the amplitude of the magnetic field disturbance [bz(r)] associated with these oscillations is measured at various times during the decay of the afterglow plasma. A theoretical description of these oscillations is developed in which the collision frequencies between the various plasma constituents are treated as free parameters. The values of these free parameters at any given instant during the decay of the plasma are determined by fitting computed bz{r) radial profiles to the measured ones. The electron temperature Te, and the ion-neutral cross section for momentum transfer QD are deduced from these collision frequencies. The reliability of this plasma diagnostic technique is demonstrated by its ability to yield values for Te and QD which compare favourably with the results obtained by other workers.

Sign in / Sign up

Export Citation Format

Share Document