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Divertor infrared thermography on COMPASS
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SYSNO ASEP 0544048 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Divertor infrared thermography on COMPASS Author(s) Vondráček, Petr (UFP-V) RID, ORCID
Gauthier, E. (FR)
Grof, M. (CZ)
Hron, Martin (UFP-V) RID, ORCID
Komm, Michael (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDNumber of authors 6 Source Title Fusion Engineering and Design. - : Elsevier - ISSN 0920-3796
Roč. 146, September (2019), s. 1003-1006Number of pages 4 s. Language eng - English Country CH - Switzerland Keywords Infra-red thermography ; Scrape-off layer ; Tokamak 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) GA16-14228S GA ČR - Czech Science Foundation (CSF) EF16_019/0000768 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000488307400225 EID SCOPUS 85061580319 DOI 10.1016/j.fusengdes.2019.01.142 Annotation A new fast divertor infra-red thermography system was put into operation on COMPASS. It provides full radial coverage of the bottom open divertor with pixel resolution ∼0.6–1.1 mm/px on the target surface and temporal resolution better than 20 μs. The system consists of fast IR camera TELOPS Fast-IR 2K placed in a magnetic shielding box, a positionable holder, a 1 m long IR endoscope consisting of 14 Ge and Si lenses securing off-axis view from an upper inner vertical port and a special graphite divertor tile optimized for IR thermography. The tile is equipped with a heating system allowing tile preheating up to 250 °C. Embedded thermoresistors and a calibration target (a deep narrow hole acting as a black body radiator) allows in-situ calibration of the system including estimation of the target surface emissivity. Furthermore, a roof-top shaped structure on top of the tile increases magnetic field incidence angles above 3 degrees. Laboratory tests of the system performed during its commissioning are presented. The global transmission of the optical system was found to be τ ≈ 40–50%. Poor spatial resolution compared to the design value was observed. Too large surface error of individual lenses was identified as the main cause and re-manufacturing of the most critical lens was suggested. First experimental results obtained using the IR system are presented: divertor heat flux profiles in L-mode with the heat flux decay length λ qomp =2.1−3.3 mm and average H-mode heat flux profiles in an inter-ELM period and during an ELM heat flux maximum with λ qomp ≈0.6 mm and λ qomp ≈6.7 mm, respectively. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0920379619301607?via%3Dihub
Number of the records: 1