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Power deposition on misaligned edges in COMPASS.
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SYSNO ASEP 0481467 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Power deposition on misaligned edges in COMPASS. Author(s) Dejarnac, Renaud (UFP-V) RID, ORCID
Corre, Y. (FR)
Vondráček, Petr (UFP-V) RID, ORCID
Gardarein, J.-L. (FR)
Gaspar, J. (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. (FR)Source Title Nuclear Materials and Energy. - : Elsevier
Roč. 12, August (2017), s. 1374-1378Number of pages 5 s. Publication form Print - P Action PSI 2016 - 22nd International Conference on Plasma Surface Interactions in Controlled Fusion Devices/22./ Event date 30.05.2016 - 03.06.2016 VEvent location Roma Country IT - Italy Event type WRD Language eng - English Country US - United States Keywords plasma ; tokamak ; COMPASS Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000417293300230 EID SCOPUS 84990842224 DOI 10.1016/j.nme.2016.09.009 Annotation If the decision is made not to apply a toroidal chamfer to tungsten monoblocks at ITER divertor vertical targets, exposed leading edges will arise as a result of assembly tolerances between adjacent plasma-facing components. Then, the advantage of glancing magnetic field angles for spreading plasma heat flux on top surfaces is lost at the misaligned edges with an interaction occurring at near normal incidence, which can drive melting for the expected inter-ELM heat fluxes. A dedicated experiment has been performed on the COMPASS tokamak to thoroughly study power deposition on misaligned edges using inner-wall limited discharges on a special graphite tile presenting gaps and leading edges directly viewed by a high resolution infra-red camera. The parallel power flux deducted from the unperturbed measurement far from the gap is fully consistent with the observed temperature increase at the leading edge, respecting the power balance. All the power flowing into the gap is deposited at the leading edge and no mitigation factor is required to explain the thermal response. Particle-in-cell simulations show that the ion Larmor smoothing effect is weak and that the power deposition on misaligned edges is well described by the optical approximation because of an electron dominated regime associated with non-ambipolar parallel current flow. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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