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Generalized collisi...
Generalized collision operator for fast electrons interacting with partially ionized impurities
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- Hesslow, Linnea, 1993 (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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- Dubois, Timothy, 1982 (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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- Rahm, Martin, 1982 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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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)
- 2018
- 2018
- English.
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In: Journal of Plasma Physics. - 0022-3778 .- 1469-7807. ; 84:6
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Abstract
Subject headings
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- Accurate modelling of the interaction between fast electrons and partially ionized atoms is important for evaluating tokamak disruption mitigation schemes based on material injection. This requires accounting for the effect of screening of the impurity nuclei by the cloud of bound electrons. In this paper, we generalize the Fokker–Planck operator in a fully ionized plasma by accounting for the effect of screening. We detail the derivation of this generalized operator, and calculate the effective ion length scales, needed in the components of the collision operator, for a number of ion species commonly appearing in fusion experiments. We show that for high electric fields, the secondary runaway growth rate can be substantially larger than in a fully ionized plasma with the same effective charge, although the growth rate is significantly reduced at near-critical electric fields. Furthermore, by comparison with the Boltzmann collision operator, we show that the Fokker–Planck formalism is accurate even for large impurity content.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (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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Embréus, Ola, 19 ...
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Hoppe, Mathias, ...
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Dubois, Timothy, ...
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Papp, Gergely, 1 ...
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Rahm, Martin, 19 ...
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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 Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
- Articles in the publication
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Journal of Plasm ...
- By the university
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Chalmers University of Technology