Modified Zakharov equations in dusty plasmas with variable charges on dust particles

2003 ◽  
Vol 10 (4) ◽  
pp. 984-988 ◽  
Author(s):  
Mouloud Tribeche ◽  
Taha Houssine Zerguini
Keyword(s):  
Dusty Plasmas ◽  
Dust Particles

Effects of charge dispersion in dusty plasmas

1995 ◽  
Vol 54 (3) ◽  
pp. 373-391 ◽  
Author(s):  
T. K. Aslaksen
Keyword(s):  
Charge Distribution ◽  
Dusty Plasmas ◽  
Dust Particles ◽  
Dust Charge ◽  
Kinetic Effects ◽  
Current Equation

We investigate the charge-dispersive effects on a sheath of monosized dust particles in equilibrium. This is done through describing the dust particles by using equations in (x, v) space (kinetic space) that include terms originating from the charge distribution of the dust particles. The charge-dispersive terms are assumed to be completely determined by the local charging processes. We find that the effects due to these terms are opposed by the ordinary gradient terms in the current equation in kinetic space, and they are therefore smaller than first expected. We also identify kinetic effects that are not included in the usual expression for the dust charge in hydrodynamic space.

scholarly journals Magnetosonic solitons in a dusty plasma slab

2008 ◽  
Vol 74 (5) ◽  
pp. 601-605 ◽  
Author(s):  
M. MARKLUND ◽  
L. STENFLO ◽  
P. K. SHUKLA
Keyword(s):  
Dusty Plasma ◽  
Nonlinear Equations ◽  
Dusty Plasmas ◽  
Sharp Contrast ◽  
Dust Particles ◽  
Magnetized Plasmas ◽  
Nonlinear Structures ◽  
Magnetohydrodynamic Equations ◽  
Plasma Slab

AbstractThe existence of magnetosonic solitons in dusty plasmas is investigated. The nonlinear magnetohydrodynamic equations for a warm dusty magnetoplasma are thus derived. A solution of the nonlinear equations is presented. It is shown that, owing to the presence of dust, static structures are allowed. This is in sharp contrast to the formation of the so-called shocklets in usual magnetoplasmas. A comparatively small number of dust particles can thus drastically alter the behavior of the nonlinear structures in magnetized plasmas.

Transport control of dust particles by pulse-time modulated RF in dusty plasmas

2019 ◽  
Vol 126 (4) ◽  
pp. 043302
Author(s):  
Jiashu Lin ◽  
Kuri Hashimoto ◽  
Rui Togashi ◽  
Almasbek Utegenov ◽  
Marie Hénault ◽  
...  
Keyword(s):  
Dusty Plasmas ◽  
Dust Particles ◽  
Pulse Time ◽  
Transport Control

The floating potential of spherical probes and dust grains. II: Orbital motion theory

2003 ◽  
Vol 69 (6) ◽  
pp. 485-506 ◽  
Author(s):  
R. V. KENNEDY ◽  
J. E. ALLEN
Keyword(s):  
Analytical Solution ◽  
Surface Potential ◽  
Orbital Motion ◽  
Dusty Plasmas ◽  
Dust Particles ◽  
Floating Potential ◽  
Probe Surface ◽  
Full Theory ◽  
Ion Absorption ◽  
Yukawa Theory

Probe theory is generally used to find the potential of dust particles immersed in plasma. The orbital motion limited theory (OML) is often used to find the potential at the probe surface, but the assumptions underlying this theory are usually not valid in the case of dust and the more general orbital motion (OM) theory is much harder to calculate. Solutions are given for the OM theory in a range of cases applicable to dust. It is shown that the surface potential the full theory gives reduces to the OML result for small probes. Commonly in dusty plasmas the OML surface potential is used, with the surrounding distribution given by Debye–Hückel, or Yukawa theory. This form, however, neglects ion depletion due to the absorption of particles on the probe surface. In this paper a new analytical solution to the system is given which is applicable to small probes and dust. This new expression is equivalent to Yukawa form, but takes ion absorption into account.

Complex (dusty) plasmas: Examples for applications and observation of magnetron-induced phenomena

2005 ◽  
Vol 77 (2) ◽  
pp. 415-428 ◽  
Author(s):  
H. Kersten ◽  
G. Thieme ◽  
M. Fröhlich ◽  
D. Bojic ◽  
D. H. Tung ◽  
...  
Keyword(s):  
Chemical Vapor ◽  
Dusty Plasmas ◽  
Dust Particles ◽  
Rf Plasma ◽  
Magnetron Discharge ◽  
Organic Precursor ◽  
Carbon Particles ◽  
Metal Organic ◽  
The Stability ◽  
New Applications

Low-pressure plasmas offer a unique possibility of confinement, control, and fine tailoring of particle properties. Hence, dusty plasmas have grown into a vast field, and new applications of plasma-processed dust particles are emerging.During the deposition of thin amorphous films onto melamine formaldehyde (MF) microparticles in a C2H2 plasma, the generation of nanosized carbon particles was also studied. The size distribution of those particles is quite uniform.In another experiment, the stability of luminophore grains could be improved by coating with protective Al2O3 films that are deposited by a plasma-enhanced chemical vapor deposition (PECVD) process using a metal-organic precursor gas. Coating of SiO2 microparticles with thin metal layers by magnetron sputtering is also described. Especially the interaction of the microsized grains confined in a radio frequency (rf) plasma with the dc magnetron discharge during deposition was investigated. The observations emphasize that the interaction between magnetron plasma and injected microdisperse powder particles can also be used as a diagnostic tool for the characterization of magnetron sputter sources.

scholarly journals Structure of spherical Yukawa clusters: A model for dust particles in dusty plasmas in an isotropic environment

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
Hiroo Totsuji ◽  
Takafumi Ogawa ◽  
Chieko Totsuji ◽  
Kenji Tsuruta
Keyword(s):  
Dusty Plasmas ◽  
Dust Particles

Complex charge distributions of dielectric dust grains due to plasma flow

2000 ◽  
Vol 63 (3) ◽  
pp. 269-283 ◽  
Author(s):  
J. W. MANWEILER ◽  
T. P. ARMSTRONG ◽  
T. E. CRAVENS
Keyword(s):  
Charge Distribution ◽  
Large Fraction ◽  
Dusty Plasmas ◽  
Young Stars ◽  
Dust Particles ◽  
Total Charge ◽  
Dust Grains ◽  
Charge Distributions ◽  
Flowing Plasma ◽  
Dust Grain

We examine the charging of dielectric dust grains embedded in a plasma. Our work is a continuation and refinement of our previous research into grain charging problems. In 1993, we discussed preliminary simulation results regarding the charging and intergrain forces between two dielectric dust particles [J. W. Manweiler et al., Adv. Space Res. 13, 10175 (1993)]. Then, in 1996, we discussed preliminary results with respect to dust grain charging within asymmetric plasma conditions and how these affect grain–grain collisional cross-sections [J. W. Manweiler et al., In: The Physics of Dusty Plasmas (ed. P. K. Shukla et al.), p. 22. World Scientific, Singapore (1996)]. This work was extended to evaluate how asymmetric charging affects coagulation rates for dielectric dust grains [J. W. Manweiler et al., In: Physics of Dusty Plasmas, 7th Workshop (ed. M. Horanyi et al.), p. 12. AIP Conf. Proc. 446 (1998)]. Here we report on the results of a significant refinement to our work to study the behaviour of a dielectric dust grain in a plasma with a bulk flow. Since charge transport is inhibited on our dielectric grains, we can examine how asymmetric plasma distributions affect the symmetry of the charge distributions that develop on the surfaces of the grains. A dielectric dust grain in a flowing plasma develops a negative total charge and a dipole moment in its charge distribution that points upstream. We also use this model to study how the presence of a nearby dust grain affects the development of a grain's charge distribution. We demonstrate that a smaller grain–grain separation results in a reduced net charge on each grain. For grains in a flowing plasma, dipole moments are unaffected by close approach except when one grain is directly in the ‘wake’ of the other grain. The studies here show that monopole and dipole electrostatic forces are present when dust is bathed in flowing plasma. Recent infrared studies suggest that a large fraction of young stars have dusty envelopes [G. Schilling, Science286, 66 (1999)]. In the formation of accretion discs around young stars, dust–plasma interactions are probably important. Full details on the calculations of the results discussed in this paper are summarized from a more complete treatment of the subject by Manweiler [PhD Dissertation, University of Kansas (1997)].

Small-amplitude electrostatic solitary waves in a dusty plasma with variable charge resonant trapped dust particles

2007 ◽  
Vol 73 (6) ◽  
pp. 901-910 ◽  
Author(s):  
LEILA AIT GOUGAM ◽  
MOULOUD TRIBECHE ◽  
FAWZIA MEKIDECHE
Keyword(s):  
Solitary Waves ◽  
Small Amplitude ◽  
Charge Trapping ◽  
Dusty Plasmas ◽  
Dust Particles ◽  
Plasma Parameters ◽  
Variable Charge ◽  
Dust Charge ◽  
Temperature Equilibrium ◽  
Dust Grain

AbstractSmall-amplitude electrostatic solitary waves are investigated in unmagnetized dusty plasmas with variable charge resonant trapped dust particles. It is found that under certain conditions spatially localized structures, the height and nature of which depend sensitively on the plasma parameters, can exist. The effects of dust grain temperature, equilibrium dust charge, trapping parameter, and dust size on the properties of these solitary waves are briefly discussed. A neural network with a given architecture and learning process, and which may be useful to interpret experimental data, is outlined. Our investigation may be taken as a prerequisite for the understanding of the solitary dust waves that may occur in space as well as in laboratory plasmas.

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