scholarly journals Characteristics of Nonthermal Dupree Diffusion on Space-Charge Wave in a Kappa Distribution Plasma Column with Turbulent Diffusion

Entropy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 257
Author(s):  
Myoung-Jae Lee ◽  
Young-Dae Jung
Keyword(s):  
Diffusion Coefficient ◽  
Space Charge ◽  
Plasma Column ◽  
Separation Of Variables ◽  
Normal Modes ◽  
Nonthermal Plasma ◽  
Wave Frequency ◽  
Damping Rate ◽  
Charge Wave ◽  
Space Charge Wave

The nonthermal diffusion effects on the dispersion equations of ion-acoustic space-charge wave (SCW) in a nonthermal plasma column composed of nonthermal turbulent electrons and cold ions are investigated based on the analysis of normal modes and the separation of variables. It is found that the real portion of the wave frequency of the SCW in a Maxwellian plasma is greater than that in a nonthermal plasma. It is also found that the magnitude of the damping rate of the SCW decreases with an increase of the spectral index of the nonthermal plasma. It is also shown that the magnitude of the scaled damping rate increases with an increase of the Dupree diffusion coefficient. Moreover, the influence of the nonthermal character of the nonthermal plasma on the damping rate is found to be more significant in turbulent plasmas with higher diffusion coefficient. The variations of the wave frequency and the growth rate due to the characteristics of nonthermal diffusion are also discussed.

Resonant flow instability of space-charge waves in self-gravitating Lorentzian dusty plasma columns

2019 ◽  
Vol 97 (6) ◽  
pp. 651-655
Author(s):  
Myoung-Jae Lee ◽  
Young-Dae Jung
Keyword(s):  
Growth Rate ◽  
Space Charge ◽  
Dusty Plasma ◽  
Plasma Column ◽  
Flow Instability ◽  
Mode Analysis ◽  
Instability Mode ◽  
Resonant Instability ◽  
Charge Wave ◽  
Space Charge Wave

The dispersion characteristics and the resonant instability mode of the space-charge wave are investigated in a streaming Lorentzian dusty plasma column by using the normal mode analysis. The result shows that the non-thermal character of the Lorentzian cylindrical dusty plasma enhances the unstable property of the space-charge wave due to the beam–plasma interaction. It is found that the resonant growth rates of the space-charge wave increase with an increase of the harmonic-order of the root of the Bessel function. It is also found that the influence of the self-gravitation enhances the resonant growth rate of the space-charge wave of the Lorentzian cylindrical dusty plasma. In addition, it is found the resonant growth rate decreases with an increase of the radius of the dusty plasma column. The variation of the resonant instability mode due to the non-thermal character and geometric effects is also discussed.

scholarly journals Reactive medium instability of the space charge wave of ion beam in a plasma

1977 ◽  
Vol 64 (1) ◽  
pp. 53-55 ◽  
Author(s):  
Toshitaka Idehara ◽  
Kuni Nakajima ◽  
Yoshio Ishida
Keyword(s):  
Space Charge ◽  
Ion Beam ◽  
Reactive Medium ◽  
Charge Wave ◽  
Space Charge Wave
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