Radio-frequency wave interactions with a plasma sheath in oblique-angle magnetic fields using a sheath impedance model
Abstract
Here, the physics of interactions between waves in plasmas and sheaths for background magnetic fields which make oblique angles with the sheath surfaces is studied with the use of the self-consistent finite element code rfSOL incorporating the recently developed sheath impedance model. The calculation based on this model employs the generalized sheath boundary condition (sheath BC), which surpasses the previously used capacitive sheath BC in reliability by taking into account the contributions of the ion and electron currents in the sheath as well as the displacement current. A series of numerical simulations is carried out in two-dimensional slab geometry with a flat or curved sheath surface as part of the boundary. It is shown that the sheath–plasma wave appears when the equilibrium magnetic field line angle with respect to the sheath surface is small, the absolute value of the radio-frequency (RF) sheath voltage is large, and the plasma density is slightly higher than the lower hybrid resonance density (LHR density), all of which bring the sheath property closer to being capacitive. It is also shown that the sharp variation of the magnetic field line angle along the sheath surface can sensitively affect the maximum absolute value of the RF sheathmore »
- Authors:
-
[1];
[2]
- Kyushu Institute of Technology, Fukuoka (Japan)
- Lodestar Research Corp., Boulder, CO (United States)
- Publication Date:
- Research Org.:
- Lodestar Research Corp., Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1494126
- Grant/Contract Number:
- FG02-97ER54392
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 2; Related Information: http://doi.org/10.5281/zenodo.1667247; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; radio-frequency; sheaths; fusion; finite-element method
Citation Formats
Kohno, H., and Myra, J. R. Radio-frequency wave interactions with a plasma sheath in oblique-angle magnetic fields using a sheath impedance model. United States: N. p., 2019.
Web. doi:10.1063/1.5054920.
Kohno, H., & Myra, J. R. Radio-frequency wave interactions with a plasma sheath in oblique-angle magnetic fields using a sheath impedance model. United States. https://doi.org/10.1063/1.5054920
Kohno, H., and Myra, J. R. Fri .
"Radio-frequency wave interactions with a plasma sheath in oblique-angle magnetic fields using a sheath impedance model". United States. https://doi.org/10.1063/1.5054920. https://www.osti.gov/servlets/purl/1494126.
@article{osti_1494126,
title = {Radio-frequency wave interactions with a plasma sheath in oblique-angle magnetic fields using a sheath impedance model},
author = {Kohno, H. and Myra, J. R.},
abstractNote = {Here, the physics of interactions between waves in plasmas and sheaths for background magnetic fields which make oblique angles with the sheath surfaces is studied with the use of the self-consistent finite element code rfSOL incorporating the recently developed sheath impedance model. The calculation based on this model employs the generalized sheath boundary condition (sheath BC), which surpasses the previously used capacitive sheath BC in reliability by taking into account the contributions of the ion and electron currents in the sheath as well as the displacement current. A series of numerical simulations is carried out in two-dimensional slab geometry with a flat or curved sheath surface as part of the boundary. It is shown that the sheath–plasma wave appears when the equilibrium magnetic field line angle with respect to the sheath surface is small, the absolute value of the radio-frequency (RF) sheath voltage is large, and the plasma density is slightly higher than the lower hybrid resonance density (LHR density), all of which bring the sheath property closer to being capacitive. It is also shown that the sharp variation of the magnetic field line angle along the sheath surface can sensitively affect the maximum absolute value of the RF sheath voltage at a plasma density slightly lower than the LHR density.},
doi = {10.1063/1.5054920},
journal = {Physics of Plasmas},
number = 2,
volume = 26,
place = {United States},
year = {Fri Feb 08 00:00:00 EST 2019},
month = {Fri Feb 08 00:00:00 EST 2019}
}
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Works referencing / citing this record:
Radio frequency wave interactions with a plasma sheath: The role of wave and plasma sheath impedances
journal, May 2019
- Myra, J. R.; Kohno, H.
- Physics of Plasmas, Vol. 26, Issue 5
Numerical solutions of Maxwell's equations in 3D in frequency domain with linear sheath boundary conditions
journal, August 2019
- Tierens, W.; Urbanczyk, G.; Colas, L.
- Physics of Plasmas, Vol. 26, Issue 8
Calculation of RF sheath properties from surface wave-fields: a post-processing method
journal, July 2019
- Myra, J. R.; Kohno, H.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 9
Radio frequency wave interactions with a plasma sheath: the role of wave and plasma sheath impedances
text, January 2018
- Myra, J. R.; Kohno, H.
- Zenodo