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Fluid and kinetic s...
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Ekmark, I.Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.
(author)
Fluid and kinetic studies of tokamak disruptions using Bayesian optimization
- Article/chapterEnglish2024
Publisher, publication year, extent ...
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Cambridge University Press (CUP),2024
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Numbers
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LIBRIS-ID:oai:DiVA.org:kth-347190
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-347190URI
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https://doi.org/10.1017/S0022377824000606DOI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20240604
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When simulating runaway electron dynamics in tokamak disruptions, fluid models with lower numerical cost are often preferred to more accurate kinetic models. The aim of this work is to compare fluid and kinetic simulations of a large variety of different disruption scenarios in ITER. We consider both non-activated and activated scenarios; for the latter, we derive and implement kinetic sources for the Compton scattering and tritium beta decay runaway electron generation mechanisms in our simulation tool Dream (Hoppe et al., Comput. Phys. Commun., vol. 268, 2021, 108098). To achieve a diverse set of disruption scenarios, Bayesian optimization is used to explore a range of massive material injection densities for deuterium and neon. The cost function is designed to distinguish between successful and unsuccessful disruption mitigation based on the runaway current, current quench time and transported fraction of the heat loss. In the non-activated scenarios, we find that fluid and kinetic disruption simulations can have significantly different runaway electron dynamics, due to an overestimation of the runaway seed by the fluid model. The primary cause of this is that the fluid hot-tail generation model neglects superthermal electron transport losses during the thermal quench. In the activated scenarios, the fluid and kinetic models give similar predictions, which can be explained by the significant influence of the activated sources on the runaway dynamics and the seed.
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Hoppe, MathiasKTH,Elektromagnetism och fusionsfysik(Swepub:kth)u1f38v5y
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Fulop, T.Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.
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Jansson, P.Chalmers Univ Technol, Dept Comp Sci & Engn, SE-41296 Gothenburg, Sweden.;Univ Gothenburg, SE-41296 Gothenburg, Sweden.
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Antonsson, L.Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.
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Vallhagen, O.Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.
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Pusztai, I.Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.
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Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.Elektromagnetism och fusionsfysik
(creator_code:org_t)
Related titles
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In:Journal of Plasma Physics: Cambridge University Press (CUP)90:30022-37781469-7807
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