Orbital motion of dust particles in an rf magnetron discharge. Ion drag force or neutral atom wind force

2012 ◽  
Vol 114 (3) ◽  
pp. 535-546 ◽  
Author(s):  
A. F. Pal ◽  
A. N. Ryabinkin ◽  
A. O. Serov ◽  
N. A. Dyatko ◽  
A. N. Starostin ◽  
...  
Keyword(s):  
Drag Force ◽  
Neutral Atom ◽  
Orbital Motion ◽  
Dust Particles ◽  
Wind Force ◽  
Magnetron Discharge

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 Dust Particles Near The Sun

1996 ◽  
Vol 150 ◽  
pp. 361-364
Author(s):  
L. I. Shestakova ◽  
L. V. Tambovtseva
Keyword(s):  
Solar System ◽  
Orbital Motion ◽  
Interplanetary Dust ◽  
Dust Particles ◽  
Line Of Sight ◽  
Small Contribution ◽  
The Sun ◽  
Dust Grains ◽  
Elliptic Orbits

AbstractThe orbital motion of interplanetary dust grains in the sublimation zone near the Sun has been considered for graphite and silicate. Calculations showed that dust grains with initial radii s = 0.5 - 5 μm can form regions of enhanced concentration. The inner corona is slightly enriched with particles s = 0.3 - 0.6 μm due to the departure of the evaporated grains onto highly elliptic orbits. However, they may be not recognized due to their small contribution to the total brightness along the line-of-sight compared with the background of the more typical Zodiacal particles. The astrosilicate dust grains do not form zones of enhanced concentration. Finally, particles with initial radii from 0.3 to 4 μm leave the Solar system and become β-meteoroids.

Kinetic Characteristic of the Dust Particles around the Insulators

2012 ◽  
Vol 455-456 ◽  
pp. 271-277 ◽  
Author(s):  
Jing Wang ◽  
Xi Dong Liang ◽  
Yu Liu
Keyword(s):  
Steady State ◽  
Electric Field ◽  
Drag Force ◽  
Kinetic Characteristic ◽  
Operating Conditions ◽  
Dust Particles ◽  
Field Force ◽  
Polarization Force ◽  
Electric Field Force ◽  
Accumulation Characteristic

Contamination accumulation characteristic of the insulators depends on the kinetic characteristic of the particles moving around the insulators to a great degree. There are many forces acting on the particles due to the combined influence of the electric field, the air fluid field and the gravitational field. The main four forces, which are the polarization force, the electric field force, the steady-state drag force and the gravitational force, were analyzed. Their effects on the moving particles’ trajectories were studied by both experiments and numerical calculation. The results indicate that the polarization force acts where the strength of the electric field changes strongly. Once the particles are charged, the electric field force acts and can drive the particles moving along the electric field lines. When there is a strong wind, the steady-state drag force is dominant and the particles move with the wind. These results can better explain the contamination accumulation characteristic of different insulators under different operating conditions.

Dust dynamics during the plasma afterglow

2021 ◽  
Author(s):  
Igor B Denysenko ◽  
Maxime Mikikian ◽  
Nikolai Azarenkov
Keyword(s):  
Dust Particle ◽  
Drag Force ◽  
Plasma Boundary ◽  
Dust Particles ◽  
Electric Force ◽  
Ion Density ◽  
Drag Forces ◽  
Dust Dynamics ◽  
Plasma Afterglow ◽  
Small Nanoparticles

Abstract The charge and dynamics of dust particles in an afterglow plasma are studied using a 1D model in the diffusion approximation, taking into account the transition from ambipolar to free diffusion. It is analyzed how external conditions (dust particle size, neutral gas pressure and initial electron density) affect the dust motion. The dust particle dynamics has been examined in microgravity conditions and in presence of gravity. Without gravity, the location of dust particles in plasma volume may change essentially during the afterglow if the dust size and pressure are small (≤ 10 nm and ≤ 30 mTorr, respectively). At small pressures, in the very beginning of afterglow, small nanoparticles move to the plasma boundary because the ion drag force dominates over the electric force. At afterglow times when the electron temperature becomes time-independent, the ion drag force decreases faster with time than the electric force due to the ion density decrease, and dust particles may move to the slab center. In presence of gravity, the effect of gravity force on dust particles is important only at large afterglow times (t ≥ 10 ms), when the electric and ion drag forces are small. The dust dynamics depends essentially on the initial plasma density. If the density is large (~ 1012 cm-3), small nanoparticles (≤ 10 nm) may deposit on plasma walls in the beginning of plasma afterglow because of an enhancement of the ion drag force.

scholarly journals Vortex motion of dust particles due to non-conservative ion drag force in a plasma

2016 ◽  
Vol 23 (2) ◽  
pp. 023701 ◽  
Author(s):  
Kil-Byoung Chai ◽  
Paul M. Bellan
Keyword(s):  
Drag Force ◽  
Vortex Motion ◽  
Dust Particles
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