Number of the records: 1  

Divertor infrared thermography on COMPASS

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    SYSNO ASEP0544048
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleDivertor 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) RID
    Number of authors6
    Source TitleFusion Engineering and Design. - : Elsevier - ISSN 0920-3796
    Roč. 146, September (2019), s. 1003-1006
    Number of pages4 s.
    Languageeng - English
    CountryCH - Switzerland
    KeywordsInfra-red thermography ; Scrape-off layer ; Tokamak
    Subject RIVBL - Plasma and Gas Discharge Physics
    OECD categoryFluids and plasma physics (including surface physics)
    R&D Projects8D15001 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    LM2015045 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    GA16-14228S GA ČR - Czech Science Foundation (CSF)
    EF16_019/0000768 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Method of publishingLimited access
    Institutional supportUFP-V - RVO:61389021
    UT WOS000488307400225
    EID SCOPUS85061580319
    AnnotationA 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.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza,, Tel.: 266 052 975
    Year of Publishing2022
    Electronic address
Number of the records: 1  

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