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Kinetic modelling o...
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Insulander Björk, Klara,1982Chalmers tekniska högskola,Chalmers University of Technology
(author)
Kinetic modelling of runaway electron generation in argon-induced disruptions in ASDEX Upgrade
- Article/chapterEnglish2020
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2020
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LIBRIS-ID:oai:research.chalmers.se:006491f3-dcf3-4d5c-b29e-f80e0679de04
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https://research.chalmers.se/publication/518939URI
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https://doi.org/10.1017/S0022377820000793DOI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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Massive material injection has been proposed as a way to mitigate the formation of a beam of relativistic runaway electrons that may result from a disruption in tokamak plasmas. In this paper we analyse runaway generation observed in eleven ASDEX Upgrade discharges where disruption was triggered using massive gas injection. We present numerical simulations in scenarios characteristic of on-axis plasma conditions, constrained by experimental observations, using a description of the runaway dynamics with a self-consistent electric field and temperature evolution in two-dimensional momentum space and zero-dimensional real space. We describe the evolution of the electron distribution function during the disruption, and show that the runaway seed generation is dominated by hot-tail in all of the simulated discharges. We reproduce the observed dependence of the current dissipation rate on the amount of injected argon during the runaway plateau phase. Our simulations also indicate that above a threshold amount of injected argon, the current density after the current quench depends strongly on the argon densities. This trend is not observed in the experiments, which suggests that effects not captured by zero-dimensional kinetic modelling - such as runaway seed transport - are also important.
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Papp, G.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Embréus, Ola,1991Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)embreus
(author)
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Hesslow, Linnea,1993Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hesslow
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Fülöp, Tünde,1970Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tunde
(author)
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Vallhagen, Oskar,1997Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)vaoskar
(author)
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Lier, A.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Pautasso, G.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Bock, A.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Chalmers tekniska högskolaMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG)
(creator_code:org_t)
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In:Journal of Plasma Physics86:40022-37781469-7807
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Papp, G.
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Embréus, Ola, 19 ...
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Lier, A.
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