Numerical study of an electrostatic plasma sheath with non-thermal electrons and charged nanoparticles

2019 ◽  
Vol 60 (1) ◽  
pp. e201900060 ◽  
Author(s):  
Habib Khalilpour ◽  
Vahid Foroutan
Keyword(s):  
Numerical Study ◽  
Plasma Sheath ◽  
Charged Nanoparticles

Numerical study of the sheath in magnetized dusty plasma with two-temperature electrons

2014 ◽  
Vol 81 (1) ◽  
Author(s):  
I. Driouch ◽  
H. Chatei ◽  
M. El Bojaddaini
Keyword(s):  
Dusty Plasma ◽  
Numerical Study ◽  
Plasma Sheath ◽  
Hot Electrons ◽  
Dust Grains ◽  
Magnetized Dusty Plasma ◽  
Positive Ions ◽  
Different Temperatures ◽  
Dimensionless Variables ◽  
Two Temperature

Fluid simulations are used to investigate a multi-component magnetized dusty plasma sheath. The model consists of positive ions, dust grains, and two species of electron populations. These electrons are assumed to be a sum of two Maxwellian distributions with two different temperatures (cold and hot). According to multi-fluid equations and some dimensionless variables, the dimensionless equations are obtained and solved numerically. The effect of the presence of the hot electrons in the sheath is examined. A significant change is observed in the quantities characterizing the sheath with respect to one species electrons (cold) assumption.

scholarly journals A STUDY OF RADIO FREQUENCY BLACKOUT FOR SPACE PROBE DURING ATMOSPHERIC REENTRY PHASE

2017 ◽  
Vol 5 (3) ◽  
pp. 1-15 ◽  
Author(s):  
Sidi Ahmed Bendoukha ◽  
Kei-ichi Okuyama ◽  
Bianca Szasz
Keyword(s):  
Radio Frequency ◽  
Radio Signal ◽  
Numerical Study ◽  
High Surface ◽  
High Plasma ◽  
Plasma Sheath ◽  
Space Probe ◽  
Radio Communication ◽  
Stagnation Region ◽  
Radio Blackout

During the re-entry flight, the radio signal will be interrupted, which is commonly referred to as the communications blackout. Once the plasma sheath forms in the stagnation region of a small space probe, the probe losses more than 70 percent of its downlink data. This shows that the attenuation of the radio signal is very high during the re-entry. When the probe enters the Earth’s atmosphere, the high velocity, high surface temperature and high plasma frequency cause a shock wave layer, which is the main cause of radio blackout. For other reason, the completely reflection of the electromagnetic wave at all communication lines. This study describes the theoretical and numerical study of radio communication during reentry. The paper defines an approach to end radio signal blackout occurring in the wake region and how to exactly solve the radio blackout problem using new methods as injection of coolants, the aerodynamic shaping reducing the concentration of electrons, using transceiver with high operating frequency or interaction of Static Magnetic Field (SMF). Data from OREX probe are used to prove the solution to the Radio Frequency (RF) blackout problem. The significance of the used SMF method is established by computing the reduction in plasma attenuation.

Numerical study of a direct current plasma sheath based on kinetic theory

2002 ◽  
Vol 9 (2) ◽  
pp. 691-700 ◽  
Author(s):  
Aleksey V. Vasenkov ◽  
Bernie D. Shizgal
Keyword(s):  
Kinetic Theory ◽  
Direct Current ◽  
Numerical Study ◽  
Plasma Sheath ◽  
Direct Current Plasma

Numerical study of the controlled electrodeposition of charged nanoparticles in an electric field

2019 ◽  
Vol 129 ◽  
pp. 28-39 ◽  
Author(s):  
Hector Rusinque ◽  
Elena Fedianina ◽  
Alfred Weber ◽  
Gunther Brenner
Keyword(s):  
Electric Field ◽  
Numerical Study ◽  
Charged Nanoparticles

The effects of electron energy distribution function on the plasma sheath structure in the presence of charged nanoparticles

2020 ◽  
Vol 86 (2) ◽  
Author(s):  
H. Khalilpour ◽  
G. Foroutan
Keyword(s):  
Distribution Function ◽  
Energy Distribution ◽  
Electron Energy ◽  
Electron Energy Distribution Function ◽  
Plasma Sheath ◽  
Maxwellian Distribution ◽  
Energy Distribution Function ◽  
Electron Energy Distribution ◽  
Dust Charge ◽  
Charged Nanoparticles

The effects of the electron energy distribution function (EEDF) on the structure of a dusty plasma sheath are investigated. Here, it is assumed that the electrons obey a Druyvesteyn-type distribution with a parameter $x$ controlling the shape of the EEDF. The Druyvesteyn-like distribution tends to a Maxwellian distribution as  $x$ varies from 2 to 1. Using the orbital motion limited theory, the incident electron current on the dust is evaluated for a given $x$ . The results of numerical simulations are compared with those of a Maxwellian distribution. It was found that the sheath dynamics depends strongly on the magnitude of $x$ . The sheath thickness increases monotonically with increasing $x$ . However, the absolute dust charge decreases and, as a result, the accelerating ion drag force is weakened and thus the dust number density is enhanced. For a plasma with a Druyvesteyn-like distribution, the Bohm speed is a function of $x$ and increases with increasing $x$ .

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones
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