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Validity of models ...
Validity of models for Dreicer generation of runaway electrons in dynamic scenarios
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- Olasz, S. (author)
- Budapesti Muszaki es Gazdasagtudomanyi Egyetem,Budapest University of Technology and Economics,Magyar Tudomanyos Akademia,Hungarian Academy of Sciences,Budapest Univ Technol & Econ, Inst Nucl Tech, Muegegyet Rkp 3, H-1111 Budapest, Hungary.;Ctr Energy Res, Budapest, Hungary.
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- Embréus, Ola, 1991 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.
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- Hoppe, Mathias, 1993 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.
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- Aradi, M. (author)
- Barcelona Supercomputing Center - Centro Nacional De Supercomputacion (BSC),Barcelona Supercomp Ctr BSC, Barcelona, Spain.
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- Por, D. (author)
- Budapesti Muszaki es Gazdasagtudomanyi Egyetem,Budapest University of Technology and Economics,Budapest Univ Technol & Econ, Inst Nucl Tech, Muegegyet Rkp 3, H-1111 Budapest, Hungary.
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- Jonsson, Thomas, 1974- (author)
- KTH,Fusionsplasmafysik,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Yadykin, Dimitriy, 1977 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Dept Space Earth & Environm, SE-41296 Gothenburg, Sweden.
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- Pokol, (author)
- Magyar Tudomanyos Akademia,Hungarian Academy of Sciences,Budapesti Muszaki es Gazdasagtudomanyi Egyetem,Budapest University of Technology and Economics
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(creator_code:org_t)
- 2021-04-28
- 2021
- English.
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In: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 61:6
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Abstract
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- Runaway electron modelling efforts are motivated by the risk these energetic particles pose to large fusion devices. The sophisticated kinetic models can capture most features of the runaway electron generation but have high computational costs, which can be avoided by using computationally cheaper reduced kinetic codes. This paper compares the reduced kinetic and kinetic models to determine when the former solvers, based on analytical calculations assuming quasi-stationarity, can be used. The Dreicer generation rate is calculated by two different solvers in parallel in a workflow developed in the European integrated modelling framework, and this is complemented by calculations of a third code that is not yet integrated into the framework. Runaway Fluid, a reduced kinetic code, NORSE, a kinetic code using non-linear collision operator, and DREAM, a linearized Fokker-Planck solver, are used to investigate the effect of a dynamic change in the electric field for different plasma scenarios spanning across the whole tokamak-relevant range. We find that on time scales shorter than or comparable to the electron-electron collision time at the critical velocity for runaway electron generation, kinetic effects not captured by reduced kinetic models play an important role. This characteristic time scale is easy to calculate and can reliably be used to determine whether there is a need for kinetic modelling or cheaper reduced kinetic codes are expected to deliver sufficiently accurate results. This criterion can be automated, and thus it can be of great benefit for the comprehensive self-consistent modelling frameworks that are attempting to simulate complex events such as tokamak start-up or disruptions.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- NATURVETENSKAP -- Data- och informationsvetenskap -- Bioinformatik (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Bioinformatics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- runaway electron
- kinetic modelling
- tokamak
- integrated modelling
- Dreicer generation
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Olasz, S.
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Embréus, Ola, 19 ...
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Hoppe, Mathias, ...
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Aradi, M.
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Por, D.
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Jonsson, Thomas, ...
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show more...
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Yadykin, Dimitri ...
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Pokol,
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- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Mechanical Engin ...
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and Applied Mechanic ...
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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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- 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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Nuclear Fusion
- By the university
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Chalmers University of Technology
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Royal Institute of Technology