Ionization waves in low-current dc discharges in noble gases obtained with a hybrid kinetic-fluid model
Abstract
A hybrid kinetic-fluid model is used to study ionization waves (striations) in a low-current plasma column of dc discharges in noble gases. Coupled solutions of a kinetic equation for electrons, a drift-diffusion equation for ions, and a Poisson equation for the electric field are obtained to clarify the nature of plasma stratification in the positive column. A simplified two-level excitation-ionization model is used for the conditions when the nonlinear effects due to stepwise ionization, gas heating, and Coulomb interactions among electrons are negligible. It is confirmed that the nonlocal effects are responsible for the formation of moving striations in dc discharges at low plasma densities and low values of pR (the product of gas pressure and tube radius). Here, the calculated properties of self-excited waves of S–, P–, and R types in neon and S type in argon agree with available experimental data. The reason for helium plasma stability to stratification is clarified. It is shown that sustaining stratified plasma is more efficient than striation-free plasma when the ionization rate is a nonlinear function of the electric field. However, the nonlinear dependence of the ionization rate on the electric field is not required for plasma stratification. Striations of S–, P–,more »
- Authors:
-
[1];
[2]
- Univ. of Alabama, Huntsville, AL (United States); CFD Research Corporation, Huntsville, AL (United States)
- CFD Research Corporation, Huntsville, AL (United States)
- Publication Date:
- Research Org.:
- Univ. of Alabama, Huntsville, AL (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF)
- OSTI Identifier:
- 1915453
- Alternate Identifier(s):
- OSTI ID: 1906240
- Grant/Contract Number:
- SC0021391; OIA 1655280; OIA-2148653
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. E
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 6; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Electrostatic waves & oscillations; Glow & corona plasma discharges; Plasma instabilities
Citation Formats
Kolobov, Vladimir I., and Arslanbekov, Robert R. Ionization waves in low-current dc discharges in noble gases obtained with a hybrid kinetic-fluid model. United States: N. p., 2022.
Web. doi:10.1103/physreve.106.065206.
Kolobov, Vladimir I., & Arslanbekov, Robert R. Ionization waves in low-current dc discharges in noble gases obtained with a hybrid kinetic-fluid model. United States. https://doi.org/10.1103/physreve.106.065206
Kolobov, Vladimir I., and Arslanbekov, Robert R. Wed .
"Ionization waves in low-current dc discharges in noble gases obtained with a hybrid kinetic-fluid model". United States. https://doi.org/10.1103/physreve.106.065206. https://www.osti.gov/servlets/purl/1915453.
@article{osti_1915453,
title = {Ionization waves in low-current dc discharges in noble gases obtained with a hybrid kinetic-fluid model},
author = {Kolobov, Vladimir I. and Arslanbekov, Robert R.},
abstractNote = {A hybrid kinetic-fluid model is used to study ionization waves (striations) in a low-current plasma column of dc discharges in noble gases. Coupled solutions of a kinetic equation for electrons, a drift-diffusion equation for ions, and a Poisson equation for the electric field are obtained to clarify the nature of plasma stratification in the positive column. A simplified two-level excitation-ionization model is used for the conditions when the nonlinear effects due to stepwise ionization, gas heating, and Coulomb interactions among electrons are negligible. It is confirmed that the nonlocal effects are responsible for the formation of moving striations in dc discharges at low plasma densities and low values of pR (the product of gas pressure and tube radius). Here, the calculated properties of self-excited waves of S–, P–, and R types in neon and S type in argon agree with available experimental data. The reason for helium plasma stability to stratification is clarified. It is shown that sustaining stratified plasma is more efficient than striation-free plasma when the ionization rate is a nonlinear function of the electric field. However, the nonlinear dependence of the ionization rate on the electric field is not required for plasma stratification. Striations of S–, P–, and R types in neon exist with minimal or no ionization enhancement. Effects of the column length and plasma density on the wave properties are demonstrated.},
doi = {10.1103/physreve.106.065206},
journal = {Physical Review. E},
number = 6,
volume = 106,
place = {United States},
year = {Wed Dec 21 00:00:00 EST 2022},
month = {Wed Dec 21 00:00:00 EST 2022}
}
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