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Power loads to misaligned edges in COMPASS
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SYSNO ASEP 0451082 Document Type C - Proceedings Paper (int. conf.) R&D Document Type The record was not marked in the RIV Title Power loads to misaligned edges in COMPASS Author(s) Dejarnac, Renaud (UFP-V) RID, ORCID
Corre, C. (FR)
Vondráček, Petr (UFP-V) RID, ORCID
Gardarein, J.-L. (FR)
Gauthier, E. (FR)
Gunn, J. P. (FR)
Horáček, Jan (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Komm, Michael (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RID
Pitts, R. A. (GB)Source Title 15th International Conference on PLASMA-FACING MATERIALS and COMPONENTS for FUSION APPLICATIONS. - Aix-en-Provence : Commissariat à l'Energie Atomique, 2015 Publication form Online - E Action International Conference on PLASMA-FACING MATERIALS and COMPONENTS for FUSION APPLICATIONS/15./ Event date 18.05.2015-22.05.2015 VEvent location Aix-en-Provence Country FR - France Event type WRD Language eng - English Country FR - France Keywords Heat loads ; limiter ; leading edge ; IR thermography Subject RIV BL - Plasma and Gas Discharge Physics Institutional support UFP-V - RVO:61389021 Annotation A major issue for ITER divertor are leading edges (LE) between monoblocks. Geometrical arguments assume that power loads on the top and side of a LE may be described by Qn = q//,0*sin(α) and Qs = q//,0*cos(α), respectively. This assumption has recently been challenged by edge melting experiments on JET, which found that the theoretically expected Qs needed to be reduced by a factor 5 (fs = 0.2) in L-mode to explain the observed power load, whilst Qn was as expected (fn = 1), violating power balance. A dedicated experiment has thus been designed on COMPASS to study this phenomenon. Simulations of this experiment show mitigation factors (0.5 < fs < 0.8) increasing with LE misalignment and find that missing power to the side is re-deposited on the next tile top surface, yielding fn > 1 consistent with power balance. Using simulated power load profiles input to 2D thermal calculations agree well with IR data. Importantly, low values of fs reported in JET case are not observed in COMPASS Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2016
Number of the records: 1