Numerical simulations of edge localised modes in MAST-U plasmas

S. F. Smith, S. J.P. Pamela, A. J. Thornton, D. Moulton, M. Hölzl, A. Kirk, H. R. Wilson, G. T.A. Huijsmans

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Edge localised modes (ELMs) are magneto-hydrodynamic (MHD) instabilities that drive filamentary plasma eruptions in high confinement tokamak discharges [1]. Gaining an improved understanding of ELMs is important [2]; in future fusion reactors such as ITER, ELM heat fluxes will need to be limited to ensure durability of divertor materials [3]. A new
divertor configuration, the Super-X, will be tested on the MAST-U tokamak. The Super-X has a closed divertor designed to retain neutrals and could offer a solution for divertor heat flux control due to the increased connection length and magnetic flux expansion [4]. The effect of the new magnetic configuration on ELMs is unknown. First
simulations of ELM dynamics in MAST-U plasmas are presented using the nonlinear MHD code JOREK [5], which is being developed to establish quantitative validation against current experiments [6]. The evolution of a model MAST-U plasma has been simulated, showing filamentary structures of higher density forming in the nonlinear phase. The simulations predict energy and particle losses that are compared with data
from previous MAST experiments. A fluid neutrals model has been implemented in JOREK and will be presented, including the impact on ELM dynamics in MAST-U, considering configurations with varying divertor leg length.
Original languageEnglish
Title of host publication45th EPS Conference on Plasma Physics, EPS 2018
EditorsC. Michaut, J. Berndt, M. Mantsinen, S. Coda, G. Lapenta, S. Weber
Place of PublicationMulhouse
PublisherEuropean Physical Society (EPS)
Pages1148-1151
Number of pages4
ISBN (Electronic)9781510868441
Publication statusPublished - 1 Jan 2018
Event45th European Physical Society Conference on Plasma Physics, (EPS 2018) - Prague, Czech Republic
Duration: 2 Jul 20186 Jul 2018
https://eps2018.eli-beams.eu/en/

Conference

Conference45th European Physical Society Conference on Plasma Physics, (EPS 2018)
Abbreviated titleEPS 2018
CountryCzech Republic
CityPrague
Period2/07/186/07/18
Internet address

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Smith, S. F., Pamela, S. J. P., Thornton, A. J., Moulton, D., Hölzl, M., Kirk, A., ... Huijsmans, G. T. A. (2018). Numerical simulations of edge localised modes in MAST-U plasmas. In C. Michaut, J. Berndt, M. Mantsinen, S. Coda, G. Lapenta, & S. Weber (Eds.), 45th EPS Conference on Plasma Physics, EPS 2018 (pp. 1148-1151). Mulhouse: European Physical Society (EPS).