Influence of the inverse sheath on divertor plasma performance in tokamak edge plasma simulations
Abstract
Recently, it was shown that strong electron thermionic emission from material walls could result in the formation of an “inverse sheath”, which prevents the flow of cold ions to the wall. Such regimes look very favorably from the point of view of plasma-material interactions at the edge of magnetic fusion devices, where the problem of the erosion of plasma facing components under ion irradiation is one of the key issues for developing of future magnetic fusion reactors. However, it is not clear whether such regimes are compatible with edge plasma parameters and heat removal requirements in fusion reactors.To address the issue of practicality of the “inverse sheath” regime for edge tokamak plasma conditions, we perform a set of numerical simulations with 2D edge plasma transport code UEDGE for a DIII-D-like geometry and magnetic configuration.To describe both “standard” and “inverse sheath” conditions within the framework of the UEDGE code (which does not consider the sheath region per se), at the material surfaces, we apply effective boundary conditions which emulate both “standard” and“inverse sheath” regimes. We demonstrate that for the same input parameters, spatial distributions of edge plasma parameters corresponding to detached divertor and“inverse sheath” regimes are similar, with only a fewmore »
- Authors:
-
- Univ. of California, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1603139
- Alternate Identifier(s):
- OSTI ID: 1580609
- Grant/Contract Number:
- FG02-04ER54739
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Contributions to Plasma Physics
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 5-6; Journal ID: ISSN 0863-1042
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Masline, Rebecca, Smirnov, Roman D., and Krasheninnikov, Sergei I. Influence of the inverse sheath on divertor plasma performance in tokamak edge plasma simulations. United States: N. p., 2019.
Web. doi:10.1002/ctpp.201900097.
Masline, Rebecca, Smirnov, Roman D., & Krasheninnikov, Sergei I. Influence of the inverse sheath on divertor plasma performance in tokamak edge plasma simulations. United States. https://doi.org/10.1002/ctpp.201900097
Masline, Rebecca, Smirnov, Roman D., and Krasheninnikov, Sergei I. Sat .
"Influence of the inverse sheath on divertor plasma performance in tokamak edge plasma simulations". United States. https://doi.org/10.1002/ctpp.201900097. https://www.osti.gov/servlets/purl/1603139.
@article{osti_1603139,
title = {Influence of the inverse sheath on divertor plasma performance in tokamak edge plasma simulations},
author = {Masline, Rebecca and Smirnov, Roman D. and Krasheninnikov, Sergei I.},
abstractNote = {Recently, it was shown that strong electron thermionic emission from material walls could result in the formation of an “inverse sheath”, which prevents the flow of cold ions to the wall. Such regimes look very favorably from the point of view of plasma-material interactions at the edge of magnetic fusion devices, where the problem of the erosion of plasma facing components under ion irradiation is one of the key issues for developing of future magnetic fusion reactors. However, it is not clear whether such regimes are compatible with edge plasma parameters and heat removal requirements in fusion reactors.To address the issue of practicality of the “inverse sheath” regime for edge tokamak plasma conditions, we perform a set of numerical simulations with 2D edge plasma transport code UEDGE for a DIII-D-like geometry and magnetic configuration.To describe both “standard” and “inverse sheath” conditions within the framework of the UEDGE code (which does not consider the sheath region per se), at the material surfaces, we apply effective boundary conditions which emulate both “standard” and“inverse sheath” regimes. We demonstrate that for the same input parameters, spatial distributions of edge plasma parameters corresponding to detached divertor and“inverse sheath” regimes are similar, with only a few minor differences. We discuss the compatibility of “inverse sheath” regimes with core plasma parameters.},
doi = {10.1002/ctpp.201900097},
journal = {Contributions to Plasma Physics},
number = 5-6,
volume = 60,
place = {United States},
year = {Sat Dec 28 00:00:00 EST 2019},
month = {Sat Dec 28 00:00:00 EST 2019}
}
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