Negative drag force on finite-size charged dust grain in strongly collisional plasma

2017 ◽  
Vol 24 (10) ◽  
pp. 103704 ◽  
Author(s):  
A. I. Momot
Keyword(s):  
Drag Force ◽  
Finite Size ◽  
Collisional Plasma ◽  
Charged Dust ◽  
Dust Grain

Ion drag force on a dust grain in a weakly ionized collisional plasma

2013 ◽  
Vol 20 (1) ◽  
pp. 013701 ◽  
Author(s):  
I. L. Semenov ◽  
A. G. Zagorodny ◽  
I. V. Krivtsun
Keyword(s):  
Drag Force ◽  
Collisional Plasma ◽  
Weakly Ionized ◽  
Dust Grain

Limits of validity for orbital-motion-limited theory for a small floating collector

2001 ◽  
Vol 65 (3) ◽  
pp. 171-180 ◽  
Author(s):  
MARTIN LAMPE
Keyword(s):  
Orbital Motion ◽  
Finite Size ◽  
High Plasma ◽  
Plasma Phys ◽  
Positive Energy ◽  
Charged Dust ◽  
Potential Barriers ◽  
Maxwellian Plasma ◽  
High Plasma Density ◽  
Dust Grain

The orbital-motion-limited (OML) theory has been widely used to calculate the ion response to a charged grain immersed in plasma. The theory assumes there are no potential barriers preventing plasma ions from reaching positive-energy points in phase space. However, Allen et al. [J. Plasma Phys.63, 299 (2000)] have recently shown that for any finite-size negatively charged dust grain in a Maxwellian plasma, there are always potential barriers sufficient to exclude some ions. We calculate the magnitude of the potential barriers, and determine which ions are subject to barriers. The OML theory is shown to become exact in the limit of small grain size, and to be very accurate in calculating ion current to the grain for typical conditions pertinent to dusty plasma. Thus OML theory is well justified in calculating the floating potential. However, we find that potential barriers can influence the shielding of the potential at r ∼ λD under some conditions, especially large grams, high plasma density, and small Ti/Te.

scholarly journals Approximate Analytical Solution of Nonlinear Evolution Equations

2020 ◽  
Author(s):  
Laxmikanta Mandi ◽  
Kaushik Roy ◽  
Prasanta Chatterjee
Keyword(s):  
Acoustic Waves ◽  
Evolution Equations ◽  
Solitary Wave Solution ◽  
Perturbation Technique ◽  
Nonlinear Evolution Equations ◽  
Charged Dust ◽  
De Vries ◽  
Frame Work ◽  
Dust Grain ◽  
Charged Ions

Analytical solitary wave solution of the dust ion acoustic waves (DIAWs) is studied in the frame-work of Korteweg-de Vries (KdV), damped force Korteweg-de Vries (DFKdV), damped force modified Korteweg-de Vries (DFMKdV) and damped forced Zakharov-Kuznetsov (DFZK) equations in an unmagnetized collisional dusty plasma consisting of negatively charged dust grain, positively charged ions, Maxwellian distributed electrons and neutral particles. Using reductive perturbation technique (RPT), the evolution equations are obtained for DIAWs.

Charged dust grain acceleration in tokamak edges

2008 ◽  
Vol 372 (12) ◽  
pp. 2053-2055 ◽  
Author(s):  
P.K. Shukla ◽  
N.L. Tsintsadze
Keyword(s):  
Charged Dust ◽  
Dust Grain

Retention of Small Charged Dust in Planet Forming Disks

2018 ◽  
Vol 14 (S345) ◽  
pp. 283-284
Author(s):  
Vitaly Akimkin
Keyword(s):  
Coulomb Repulsion ◽  
Central Star ◽  
Charged Dust ◽  
Micron Size ◽  
Disk Evolution ◽  
Small Grains ◽  
Fast Drift ◽  
Dust Grain ◽  
Dust Evolution ◽  
Dust Charging

AbstractDust evolution in disks around young stars is a key ingredient for the global disk evolution and accompanying planet formation. The mutual sticking of initially small grains is not straightforward and can be hampered by several processes. This includes dust grain bouncing, fragmentation, electrostatic repulsion and fast drift to the central star. In this study we aim at theoretical modeling of the dust coagulation coupled with the dust charging and disk ionization calculations. We show that the electrostatic barrier is a strong restraining factor to the coagulation of micron-size dust. While the sustained turbulence helps to overcome the electrostatic barrier, dust fluffiness limits this opportunity. Coulomb repulsion may keep a significant fraction of m dust in large regions of protoplanetary disks.

Nonlinear dynamics of a charged dust grain in a plasma

1997 ◽  
Vol 4 (12) ◽  
pp. 4210-4217 ◽  
Author(s):  
Yves Elskens ◽  
David P. Resendes ◽  
J. T. Mendonça
Keyword(s):  
Nonlinear Dynamics ◽  
Charged Dust ◽  
Dust Grain

scholarly journals Excitation of Gould–Trivelpiece mode by streaming particles in dusty plasma

2019 ◽  
Vol 37 (01) ◽  
pp. 122-127 ◽  
Author(s):  
Daljeet Kaur ◽  
Suresh C. Sharma ◽  
R.S. Pandey ◽  
Ruby Gupta
Keyword(s):  
Dusty Plasma ◽  
Collisionless Plasma ◽  
Charged Dust ◽  
Particle Interactions ◽  
First Order ◽  
Transfer Processes ◽  
Ion Plasma ◽  
Energy And Momentum ◽  
Dust Grain ◽  
First Order Perturbation

AbstractIn this paper, we study the excitation of Gould–Trivelpiece (TG) waves by streaming ions in dusty plasma and derive the dispersion relation of the excited waves using first-order perturbation theory. The motion of charged particles is controlled by electromagnetic fields in plasma. The energy transfer processes which occur in this collisionless plasma are believed to be based on wave–particle interactions. We have found that the TG waves may be generated in a streaming ion plasma via Cerenkov interaction, and the ions may be accelerated by TG waves via cyclotron interaction, which enable energy and momentum transfer. The variation in the growth rate of TG wave with dust grain size and relative density of negatively charged dust grains is also studied. The dust can cause an unstable TG mode to be stable in Doppler resonance, and can induce an instability in Cerenkov interaction.

Kinetic approach for the ion drag force in a collisional plasma

2005 ◽  
Vol 71 (1) ◽  
Author(s):  
A. V. Ivlev ◽  
S. K. Zhdanov ◽  
S. A. Khrapak ◽  
G. E. Morfill
Keyword(s):  
Drag Force ◽  
Collisional Plasma ◽  
Kinetic Approach
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