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Heat loads on poloidal and toroidal edges of castellated plasma-facing components in COMPASS
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SYSNO ASEP 0489810 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Heat loads on poloidal and toroidal edges of castellated plasma-facing components in COMPASS Author(s) Dejarnac, Renaud (UFP-V) RID, ORCID
Corre, Y. (FR)
Vondráček, Petr (UFP-V) RID, ORCID
Gaspar, J. (FR)
Gauthier, E. (FR)
Gunn, J. P. (FR)
Komm, Michael (UFP-V) RID, ORCID
Gardarein, J.-L. (FR)
Horáček, Jan (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Matějíček, Jiří (UFP-V) RID, ORCID
Pitts, R.A. (FR)
Pánek, Radomír (UFP-V) RIDArticle number 066003 Source Title Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 58, č. 6 (2018)Number of pages 14 s. Publication form Print - P Language eng - English Country AT - Austria Keywords heat loads ; leading edge ; gaps ; PIC ; castellated ; PFC ; IR ; power deposition Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA16-14228S GA ČR - Czech Science Foundation (CSF) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000429838000001 EID SCOPUS 85047213189 DOI 10.1088/1741-4326/aab973 Annotation Experiments have been performed in COMPASS to study power deposition processes on poloidal and toroidal edges of castellated PFCs. In the case of poloidal edges, when the contribution from local radiation is taken into account, q_par deduced from unperturbed, upstream measurements is fully consistent with the observed temperature increase at edges of various heights, respecting power balance assuming simple projection of the parallel flux density. The Larmor smoothing effect is found to be weak and the power deposition on poloidal edge is better described by the optical approximation, which is consistent with an electron-dominated regime (non-ambipolar conditions). In the case of toroidal gap, the different contributions of the total incoming flux along the gap have been observed experimentally for the first time. They confirm results of recent numerical studies performed for ITER showing that in specific cases the heat deposition does not necessarily follow the optical approximation. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2019
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