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Scaling of L-mode heat flux for ITER and COMPASS-U divertors, based on five tokamaks

Content Provider	Scilit
Author	Horacek, J. Adamek, J. Komm, M. Seidl, J. Vondracek, P. Jardin, A. Guillemaut, Ch. Elmore, S. Thornton, A. Jirakova, K. Jaulmes, F. Deng, G. Gao, X. Wang, L. Ding, R. Brunner, D. LaBombard, B. Olsen, J. Rasmussen, J. J. Nielsen, A. H. Naulin, V. Ezzat, M. Camacho, K. M. Hron, M. Matthews, G. F.
Copyright Year	2020
Description	Journal: Nuclear Fusion
Abstract	This contribution aims to improve existing scalings of the L-mode power decay length $λqomp , especially for plasma configurations with strike points at the ITER-relevant location—closed vertical divertor targets. We propose 13 newλqomp scalings based on data from the tokamaks JET, EAST, MAST, Alcator C-mod and COMPASS, and validate them against the output of the 2D turbulence code HESEL. The analysis covers 500 divertor heat flux profiles (obtained by probes or IR cameras), measured in L-mode discharges with varying 12 global plasma parameters (all well predictable). We find that the two previously published scalings (Eich 2013 J. Nucl. Mat. 438 S72) and (Scarabosio 2013 J. Nucl. Mat. 438 S426), which were based on outer target data from AUG and JET, describe the JET, C-mod and COMPASS profiles well. This holds not only at the outer horizontal and vertical targets, but surprisingly also at the inner vertical targets. In contrast, EAST, HESEL and especially MAST data are poorly described by these two scalings. We therefore derive 13 new scalings, which account for 85–92 % of the measuredλqomp variability across all five tokamaks. Although each of the scalings is based on a different parameter combination, their predictions for the ITER and COMPASS-Upgrade tokamaks are very similar. Just before the L-H transition in the ITER baseline scenario, the presented scalings predict valuesλqomp=3.0\pm0.5 mm. For the COMPASS-Upgrade tokamak, all the scalings predict$
Related Links	https://iopscience.iop.org/article/10.1088/1741-4326/ab7e47/pdf
ISSN	00295515
e-ISSN	17414326
DOI	10.1088/1741-4326/ab7e47
Journal	Nuclear Fusion
Issue Number	6
Volume Number	60
Language	English
Publisher	IOP Publishing
Publisher Date	2020-05-05
Access Restriction	Open
Subject Keyword	Journal: Nuclear Fusion Nuclear Energy and Engineering Www.w3.org/1998/math/mathml
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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