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Ion orbit modelling of ELM heat loads on ITER divertor vertical targets.
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SYSNO ASEP 0480858 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ion orbit modelling of ELM heat loads on ITER divertor vertical targets. Author(s) Gunn, J. P. (FR)
Carpentier-Chouchana, S. (FR)
Dejarnac, Renaud (UFP-V) RID, ORCID
Escourbiac, F. (FR)
Hirai, T. (FR)
Komm, Michael (UFP-V) RID, ORCID
Kukushkin, A. (RU)
Panayotis, S. (FR)
Pitts, R.A. (FR)Source Title Nuclear Materials and Energy. - : Elsevier
Roč. 12, August (2017), s. 75-83Number of pages 9 s. Publication form Print - P Action International Conference on Plasma Surface Interactions 2016, PSI2016 /22./ Event date 30.05.2016 - 03.06.2016 VEvent location Roma Country IT - Italy Event type WRD Language eng - English Country NL - Netherlands Keywords ITER ; Divertor ; ELM heat loads Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support UFP-V - RVO:61389021 UT WOS 000417293300010 EID SCOPUS 85005950071 DOI 10.1016/j.nme.2016.10.005 Annotation The high heat flux areas on the vertical divertor targets in the ITER tokamak will consist of cuboid tungsten monoblocks bonded to copper cooling tubes. Three-dimensional ion orbit modelling is used to calculate the heating of tungsten monoblocks during ELMs at the inner vertical target, where the highest surface energy densities are expected. The presence of thin gaps between monoblocks results in exposed edges onto which the heat flux can be focused. ELM ions are focused by their gyromotion onto the magnetically shadowed, long toroidal edges of the monoblocks. The risk of monoblock edge melting is greater than the risk of full surface melting on the plasma-wetted zone. Alternative shaping solutions such as edge chamfering, filleting, and poloidal beveling do not show promise, the melt zone simply migrates to other locations on the monoblocks. Without ELM mitigation, there is a marginal risk of edge melting due to uncontrolled ELMs in the pre-nuclear phase of ITER operation, and an absolute certainty of it in the burning nuclear phase. To avoid edge melting altogether, the surface energy density would have to limited to less than 0.15 MJ/m2. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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