Characteristics of Nonthermal Dupree Diffusion on Space-Charge Wave in a Kappa Distribution Plasma Column with Turbulent Diffusion
1
Department of Physics, Hanyang University, Seoul 04763, Korea
2
Research Institute for Natural Sciences, Hanyang University, Seoul 04763, Korea
3
Department of Applied Physics and Department of Bionanotechnology, Hanyang University, Ansan, Kyunggi-Do 15588, Korea
*
Author to whom correspondence should be addressed.
Entropy 2020, 22(2), 257; https://doi.org/10.3390/e22020257
Received: 29 January 2020
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Revised: 21 February 2020
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Accepted: 22 February 2020
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Published: 24 February 2020
(This article belongs to the Special Issue Theoretical Aspects of Kappa Distributions)
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.
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MDPI and ACS Style
Lee, M.-J.; Jung, Y.-D. Characteristics of Nonthermal Dupree Diffusion on Space-Charge Wave in a Kappa Distribution Plasma Column with Turbulent Diffusion. Entropy 2020, 22, 257. https://doi.org/10.3390/e22020257
AMA Style
Lee M-J, Jung Y-D. Characteristics of Nonthermal Dupree Diffusion on Space-Charge Wave in a Kappa Distribution Plasma Column with Turbulent Diffusion. Entropy. 2020; 22(2):257. https://doi.org/10.3390/e22020257
Chicago/Turabian StyleLee, Myoung-Jae, and Young-Dae Jung. 2020. "Characteristics of Nonthermal Dupree Diffusion on Space-Charge Wave in a Kappa Distribution Plasma Column with Turbulent Diffusion" Entropy 22, no. 2: 257. https://doi.org/10.3390/e22020257
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