Journal Article

FZJ-2017-01812

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The DEMO wall load challenge

Wenninger, R. (Corresponding author) ; Albanese, R. ; Ambrosino, R. ; Arbeiter, F. ; Aubert, J. ; Barbato, L. ; Barrett, T. ; Beckers, M.FZJ* ; Biel, W.FZJ* ; Boccaccini, L. ; Carralero, D. ; Coster, D. ; Eich, T. ; Fasoli, A. ; Federici, G. ; Firdaouss, M. ; Graves, J. ; Horacek, J. ; Kovari, M. ; Lanthaler, S. ; Loschiavo, V. ; Lowry, C. ; Lux, H. ; Maddaluno, G. ; Maviglia, F. ; Mitteau, R. ; Neu, R. ; Pfefferle, D. ; Schmid, K. ; Siccinio, M. ; Sieglin, B. ; Silva, C. ; Snicker, A. ; Subba, F. ; Varje, J. ; Zohm, H. ; Bachmann, C.

2017
IAEA Vienna

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Please use a persistent id in citations: doi:10.1088/1741-4326/aa4fb4

Abstract: For several reasons the challenge to keep the loads to the first wall within engineering limits is substantially higher in DEMO compared to ITER. Therefore the pre-conceptual design development for DEMO that is currently ongoing in Europe needs to be based on load estimates that are derived employing the most recent plasma edge physics knowledge.An initial assessment of the static wall heat load limit in DEMO infers that the steady state peak heat flux limit on the majority of the DEMO first wall should not be assumed to be higher than 1.0 MW m−2. This compares to an average wall heat load of 0.29 MW m−2 for the design ${\tt {EU}}{\tt {~}}{\tt {DEMO1}}{\tt {~2015}}$ assuming a perfect homogeneous distribution. The main part of this publication concentrates on the development of first DEMO estimates for charged particle, radiation, fast particle (all static) and disruption heat loads. Employing an initial engineering wall design with clear optimization potential in combination with parameters for the flat-top phase (x-point configuration), loads up to 7 MW m−2 (penalty factor for tolerances etc not applied) have been calculated. Assuming a fraction of power radiated from the x-point region between 1/5 and 1/3, peaks of the total power flux density due to radiation of 0.6–0.8 MW m−2 are found in the outer baffle region.This first review of wall loads, and the associated limits in DEMO clearly underlines a significant challenge that necessitates substantial engineering efforts as well as a considerable consolidation of the associated physics basis.

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)
2. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2017

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Database coverage:
Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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