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First analysis of the misaligned leading edges of ITER-like plasma facing units using a very high resolution infrared camera in WEST
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SYSNO ASEP 0541110 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title First analysis of the misaligned leading edges of ITER-like plasma facing units using a very high resolution infrared camera in WEST Author(s) Grosjean, A. (FR)
Corre, Y. (FR)
Dejarnac, Renaud (UFP-V) RID, ORCID
Gaspar, J. (FR)
Gunn, J. P. (FR)
Carpentier-Chouchana, S. (FR)
Courtois, X. (FR)
Delmas, E. (FR)
De Temmerman, G. (FR)
Diez, M. (FR)
Dubus, G. (FR)
Durocher, A. (FR)
Escourbiac, F. (FR)
Firdaouss, M. (FR)
Gerardin, Jonathan (UFP-V) ORCID
Houry, M. (FR)
Pitts, R.A. (FR)
Pocheau, C. (FR)
Tsitrone, E. (FR)Number of authors 19 Article number 106020 Source Title Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 60, č. 10 (2020)Number of pages 12 s. Language eng - English Country AT - Austria Keywords heat load ; IR thermography ; ITER-like monoblocks ; leading edge ; plasma facing unit ; very high resolution ; west Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000571855100001 EID SCOPUS 85092048123 DOI 10.1088/1741-4326/ab9fa6 Annotation Twelve ITER-like plasma-facing units made of tungsten were exposed in the WEST tokamak divertor, with three plasma-facing units (PFUs) significantly overexposed to plasma heat flux: one sharp-edged PFU (vertical misalignment h = 0.8 mm) and two chamfered PFUs (h =0.6 mm and 0.3 mm, respectively). This paper describes the first temperature analysis obtained with a very high spatial resolution infrared camera (pixel size ∼ 0.1 mm) on the misaligned PFU edges and shows the consistency obtained on the parallel heat flux derived from these measurements. The analysis is focused on the hottest areas of the PFU misaligned leading edges, since the temperature detection threshold of the VHR camera is high (Tthreshold,BB ≈ 370 °C). The heat flux parallel to the magnetic field lines is assessed by matching the toroidal temperature profile in the vicinity of the leading edge with 3D finite element modelling. The tungsten emissivity assumed in this study is 0.6, which is consistent with laboratory measurements for damaged PFUs. For the three PFUs studied (with different vertical misalignments, incident angles, geometries), the derived parallel heat flux is similar, and consistent with independent measurements by a Fiber Bragg grating embedded in a graphite PFU at another toroidal location, giving confidence in future experiments using the same settings. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2021 Electronic address https://iopscience.iop.org/article/10.1088/1741-4326/ab9fa6
Number of the records: 1