Effects of two-temperature nonextensive electrons on ion-acoustic double layers

2021 ◽  
Vol 564 ◽  
pp. 125533
Author(s):  
M.M. Hatami ◽  
A.R. Niknam
Keyword(s):  
Double Layers ◽  
Nonextensive Electrons ◽  
Ion Acoustic ◽  
Ion Acoustic Double Layers ◽  
Two Temperature

Large-amplitude ion-acoustic double layers in a plasma with warm ions

1990 ◽  
Vol 68 (2) ◽  
pp. 222-226 ◽  
Author(s):  
R. K. Roychoudhury ◽  
Sikha Bhattacharyya ◽  
Y. P. Varshni
Keyword(s):  
Potential Method ◽  
Double Layers ◽  
Ion Temperature ◽  
Sagdeev Potential ◽  
Electron Population ◽  
Numerical Studies ◽  
Ion Acoustic ◽  
Temperature Electron ◽  
Ion Acoustic Double Layers ◽  
Two Temperature

The conditions for the existence of an ion-acoustic double layer in a plasma with warm ions and two distinct groups of hot electrons have been studied using the Sagdeev potential method. A comparison is made with the published results of Bharuthram and Shukla for cold ions and a two-temperature electron population. Numerical studies have been made to find out the effect of a finite ion temperature on the Mach number of the double layers.

Ion acoustic double layers forming behind irradiated solid objects in streaming plasmas

2010 ◽  
Vol 76 (3-4) ◽  
pp. 429-439 ◽  
Author(s):  
W. J. MILOCH ◽  
V. L. REKAA ◽  
H. L. PÉCSELI ◽  
J. TRULSEN
Keyword(s):  
Numerical Simulations ◽  
Uv Light ◽  
Three Dimensional ◽  
Double Layers ◽  
Back Side ◽  
Electron Population ◽  
Von Neumann ◽  
Solid Objects ◽  
Ion Acoustic ◽  
Ion Acoustic Double Layers

AbstractSmall solid metallic objects in relative motion to thermal plasmas are studied by numerical simulations. We analyze supersonic motions, where a distinctive ion wake is formed behind obstacles. At these plasma drift velocities, ions enter the wake predominantly due to deflections by the electric field in the sheath around the obstacle. By irradiating the back side of the object by ultraviolet (UV) light, we can induce also an enhanced photo-electron population there. The resulting charge distribution gives rise to a pronounced local potential and plasma density well behind the object. This potential variation has the form of a three-dimensional ion acoustic double layer, containing also an ion phase space vortex. The analysis is supported also by one-dimensional numerical simulations to illustrate the importance of boundary conditions, Dirichlet and von Neumann conditions in particular.

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