scholarly journals Dust charging in dynamic ion wakes

2020 ◽  
Vol 27 (2) ◽  
pp. 023703
Author(s):  
Lorin Swint Matthews ◽  
Dustin L. Sanford ◽  
Evdokiya G. Kostadinova ◽  
Khandaker Sharmin Ashrafi ◽  
Evelyn Guay ◽  
...  
Keyword(s):  
Dust Charging

Dust Charging and Dynamics in Tokamaks

2011 ◽  
Vol 13 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Yukihiro Tomita ◽  
Gakushi Kawamura ◽  
Zhihui Huang ◽  
Yudong Pan ◽  
Longwen Yan
Keyword(s):  
Dust Charging

Effect of magnetic field on dust charging and corresponding probe measurement

2015 ◽  
Vol 22 (11) ◽  
pp. 113704 ◽  
Author(s):  
D. Kalita ◽  
B. Kakati ◽  
B. K. Saikia ◽  
M. Bandyopadhyay ◽  
S. S. Kausik
Keyword(s):  
Magnetic Field ◽  
Probe Measurement ◽  
Dust Charging

Dust Charging and Transport on Surfaces

2011 ◽  
Author(s):  
X. Wang ◽  
S. Robertson ◽  
M. Horányi ◽  
Vladimir Yu. Nosenko ◽  
Padma K. Shukla ◽  
...  
Keyword(s):  
Dust Charging

Effects of dust charging associated with an electron beam in the cathode sheath of glow discharges

2000 ◽  
Vol 7 (3) ◽  
pp. 1053-1055 ◽  
Author(s):  
De-Zhen Wang ◽  
Jin-Yuan Liu ◽  
Teng-Cai Ma
Keyword(s):  
Electron Beam ◽  
Cathode Sheath ◽  
Glow Discharges ◽  
Dust Charging

New low-frequency waves and negative mass instability in dusty plasmas

2010 ◽  
Vol 76 (6) ◽  
pp. 929-937
Author(s):  
D. P. RESENDES ◽  
R. BINGHAM ◽  
S. MOTA ◽  
V. N. TSYTOVICH
Keyword(s):  
Electron Temperature ◽  
Free Path ◽  
Collision Frequency ◽  
Low Frequency ◽  
Mean Free Path ◽  
Sound Waves ◽  
Ion Temperature ◽  
Plasma Particle ◽  
Charging Mode ◽  
Dust Charging

AbstractLow-frequency dusty plasma waves with frequencies much smaller than the frequency of charging collisions of plasma particles with dust particles are considered taking into account elastic and charging collisions of plasma particles with dust and neutrals. The usual dust sound waves with an upper frequency equal to the dust plasma frequency are found to be present only for wavelengths much smaller than the plasma particle effective mean free path due to the effective collision frequency. The effectice collision frequency is found to be inversely proportional to the square root of the product of the charging frequency and the frequency of particle momentum losses, involving processes due to elastic plasma particle–dust collisions and collisions with neutrals. It is shown that when the wavelength of the wave is much larger than the mean free path for effective collisions, the properties of the waves are different from those considered previously. A negative mass instability is found in this domain of frequencies when the effective mean free path of ions is larger than the effective mean free path of electrons. In the absence of neutrals, this appears to be possible only if the temperature of ions exceeds the electron temperature. This can occur in laboratory experiments and space plasmas but not in plasma-etching experiments. In the absence of instability, a new dust oscillation, a dust charging mode, is found, whose frequency is almost constant over a certain range of wave numbers. It is inversely proportional to the dust mass and charging frequency of the dust. A new dust electron sound wave is found for frequencies less than the frequency of the dust charging mode. The velocity of the dust electron sound wave is determined by the electron temperature but not the ion temperature, as for the usual dust sound waves, with the electron temperature substantially exceeding the ion temperature.

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.

Sign in / Sign up

Export Citation Format

Share Document