Number of the records: 1
Spatiotemporal analysis of the runaway distribution function from synchrotron images in an ASDEX Upgrade disruption
- 1.
SYSNO ASEP 0543173 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Spatiotemporal analysis of the runaway distribution function from synchrotron images in an ASDEX Upgrade disruption Author(s) Hoppe, M. (SE)
Hesslow, L. (SE)
Embreus, O. (SE)
Unnerfelt, L. (SE)
Papp, G. (DE)
Pusztai, I. (SE)
Fülöp, T. (SE)
Lexell, O. (SE)
Lunt, T. (DE)
Tomešová, Eva (UFP-V) ORCID
McCarthy, P.J. (IE)
Pautasso, G. (DE)
Pokol, G.I. (HU)
Por, G. (HU)
Svensson, P. (SE)Number of authors 15 Article number 855870102 Source Title Journal of Plasma Physics. - : Cambridge University Press - ISSN 0022-3778
Roč. 87, č. 1 (2020)Number of pages 25 s. Language eng - English Country US - United States Keywords fusion plasma ; runaway electrons Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000609440100001 EID SCOPUS 85092326223 DOI 10.1017/S002237782000152X Annotation Synchrotron radiation images from runaway electrons (REs) in an ASDEX Upgrade discharge disrupted by argon injection are analysed using the synchrotron diagnostic tool Soft and coupled fluid-kinetic simulations. We show that the evolution of the runaway distribution is well described by an initial hot-tail seed population, which is accelerated to energies between 25-50 MeV during the current quench, together with an avalanche runaway tail which has an exponentially decreasing energy spectrum. We find that, although the avalanche component carries the vast majority of the current, it is the high-energy seed remnant that dominates synchrotron emission. With insights from the fluid-kinetic simulations, an analytic model for the evolution of the runaway seed component is developed and used to reconstruct the radial density profile of the RE beam. The analysis shows that the observed change of the synchrotron pattern from circular to crescent shape is caused by a rapid redistribution of the radial profile of the runaway density. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022 Electronic address https://www.cambridge.org/core/services/aop-cambridge-core/content/view/D6EB3D8C8555EE96017FAA5A10705254/S002237782000152Xa.pdf
Number of the records: 1