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Power loads to misaligned edges in COMPASS
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SYSNO ASEP 0451082 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV Záznam nebyl označen do RIV Název Power loads to misaligned edges in COMPASS Tvůrce(i) 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)Zdroj.dok. 15th International Conference on PLASMA-FACING MATERIALS and COMPONENTS for FUSION APPLICATIONS. - Aix-en-Provence : Commissariat à l'Energie Atomique, 2015 Forma vydání Online - E Akce International Conference on PLASMA-FACING MATERIALS and COMPONENTS for FUSION APPLICATIONS/15./ Datum konání 18.05.2015-22.05.2015 Místo konání Aix-en-Provence Země FR - Francie Typ akce WRD Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova Heat loads ; limiter ; leading edge ; IR thermography Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Institucionální podpora UFP-V - RVO:61389021 Anotace 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 Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2016
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