Effect of quantization and positron concentration on shielding potentials in electron‐positron‐ion plasma

2020 ◽  
Author(s):  
Sidra Hafeez ◽  
Shahid Ali ◽  
Muhammed Ikram ◽  
Majid Khan
Keyword(s):  
Ion Plasma ◽  
Electron Positron ◽  
Positron Concentration

scholarly journals Twisted modes instability of electron–positron shell interacted with moving ion background

2017 ◽  
Vol 35 (3) ◽  
pp. 543-550 ◽  
Author(s):  
D. Nobahar ◽  
K. Hajisharifi ◽  
H. Mehdian
Keyword(s):  
Dispersion Relation ◽  
Laboratory Experiments ◽  
Theory Approach ◽  
Temperature Anisotropy ◽  
Ion Plasma ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
Positron Concentration ◽  
General Dispersion ◽  
Instability Growth

AbstractIn this paper, the instability of electrostatic twisted modes carrying orbital angular momentum in the moving electron–positron–ion plasma is investigated. In the kinetic theory approach, the general dispersion relation of twisted modes is derived by using Laguerre–Gaussian perturbed distribution function and electrostatic potential in the paraxial limit. Utilizing the obtained general dispersion relation for a specific case of electron–positron (e–p) shell with temperature anisotropy interacted with moving ion background, the effects of angular mode number, electrons and positrons temperature, and positron concentration on the group velocity and instability growth rate of twisted waves are illustrated, numerically. The results of the present investigation will greatly attribute to the understanding of e–p jet dynamic in astrophysical environments and laboratory experiments where the twisted modes can play a central role as a perturbed term.

scholarly journals Effects of Positron Density and Temperature on Large Amplitude Ion-acoustic Waves in an Electron - Positron - Ion Plasma

1997 ◽  
Vol 50 (2) ◽  
pp. 309 ◽  
Author(s):  
Y. N. Nejoh
Keyword(s):  
Acoustic Waves ◽  
Large Amplitude ◽  
Density Ratio ◽  
Present Theory ◽  
Electron Mass ◽  
Mass Ratio ◽  
Ion Acoustic Waves ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic

The nonlinear wave structures of large amplitude ion-acoustic waves are studied in a plasma with positrons. We have presented the region of existence of the ion-acoustic waves by analysing the structure of the pseudopotential. The region of existence sensitively depends on the positron to electron density ratio, the ion to electron mass ratio and the positron to electron temperature ratio. It is shown that the maximum Mach number increases as the positron temperature increases and the region of existence of the ion-acoustic waves spreads as the positron temperature increases. The present theory is applicable to analyse large amplitude ion-acoustic waves associated with positrons which may occur in space plasmas.

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