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Evaluation of the D...
Evaluation of the Dreicer runaway generation rate in the presence of high-impurities using a neural network
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- Hesslow, Linnea, 1993 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Unnerfelt, Lucas, 1998 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Vallhagen, Oskar, 1997 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Embréus, Ola, 1991 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hoppe, Mathias, 1993 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Papp, Gergely, 1985 (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Fülöp, Tünde, 1970 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Chalmers tekniska högskola Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) (creator_code:org_t)
- 2019
- 2019
- English.
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In: Journal of Plasma Physics. - 0022-3778 .- 1469-7807. ; 85:6
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Abstract
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- Integrated modelling of electron runaway requires computationally expensive kinetic models that are self-consistently coupled to the evolution of the background plasma parameters. The computational expense can be reduced by using parameterized runaway generation rates rather than solving the full kinetic problem. However, currently available generation rates neglect several important effects; in particular, they are not valid in the presence of partially ionized impurities. In this work, we construct a multilayer neural network for the Dreicer runaway generation rate which is trained on data obtained from kinetic simulations performed for a wide range of plasma parameters and impurities. The neural network accurately reproduces the Dreicer runaway generation rate obtained by the kinetic solver. By implementing it in a fluid runaway-electron modelling tool, we show that the improved generation rates lead to significant differences in the self-consistent runaway dynamics as compared to the results using the previously available formulas for the runaway generation rate. © Cambridge University Press 2019.
Subject headings
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Data- och informationsvetenskap -- Bioinformatik (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Bioinformatics (hsv//eng)
Keyword
- runaway electrons
- fusion plasma
Publication and Content Type
- art (subject category)
- ref (subject category)
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Hesslow, Linnea, ...
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Unnerfelt, Lucas ...
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Vallhagen, Oskar ...
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Embréus, Ola, 19 ...
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Hoppe, Mathias, ...
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Papp, Gergely, 1 ...
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show more...
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Fülöp, Tünde, 19 ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Mathematics
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and Computational Ma ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Computer and Inf ...
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and Bioinformatics
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Journal of Plasm ...
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Chalmers University of Technology