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Thermal analysis of protruding surfaces in the JET divertor

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00475262" target="_blank" >RIV/61389021:_____/17:00475262 - isvavai.cz</a>

  • Result on the web

    <a href="http://dx.doi.org/10.1088/1741-4326/aa687e" target="_blank" >http://dx.doi.org/10.1088/1741-4326/aa687e</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1088/1741-4326/aa687e" target="_blank" >10.1088/1741-4326/aa687e</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Thermal analysis of protruding surfaces in the JET divertor

  • Original language description

    Tungsten (W) melting is a major concern for next step fusion devices. Two ELM induced tungsten melting experiments have been performed in JET by introducing two special target plate lamellae designed to receive excessively high ELM transient power loads. The first experiment was performed in JET in 2013 using a special lamella with a sharp leading edge gradually varying from h = 0.25 mm to 2.5 mm in order to maximise the temperature rise by exposure to the full parallel heat flux. ELM-induced transient melting has been successively achieved allowing investigation of the melt motion. However, using the available IR viewing geometry from the top, it was not possible to directly discriminate between the top and leading edge power loads. To improve the experimental validation of heat load and melt motion modelling codes, a new protruding W lamella with a 15 degrees slope facing the toroidal direction has been installed for the 2015-16 campaigns, allowing direct, spatially resolved observation of the top surface and reduced sensitivity of the analysis to the surface incidence angle of the magnetic field. This paper reports on the results of these more recent experiments, with specific focus on IR data analysis and heat flux calculations during L-mode discharges in order to investigate the behaviour of the W lamella with steady state heat load, which is a prerequisite for the more complex ELMing H-mode discharges (including both, steady and transient heat loads). It shows that, at least in L-mode, the assumption of optical heat flux projection is justified.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10305 - Fluids and plasma physics (including surface physics)

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2017

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Nuclear Fusion

  • ISSN

    0029-5515

  • e-ISSN

  • Volume of the periodical

    57

  • Issue of the periodical within the volume

    6

  • Country of publishing house

    AT - AUSTRIA

  • Number of pages

    9

  • Pages from-to

  • UT code for WoS article

    000399433800001

  • EID of the result in the Scopus database

    2-s2.0-85019416474