Use of tungsten material for the ITER divertor

Takeshi Hirai, S. Panayotis, V. Barabash, Claude Amzallag, F. Escourbiac, A. Durocher, Mario Merola, Jochen Linke, Thorsten Loewenhoff, Gerald Pintsuk, Marius Wirtz, Inge Uytdenhouwen

    Research outputpeer-review


    Since the ITER divertor design includes tungsten monoblocks in the vertical target where heat loads are maximal, the design to protect leading edges as well as technology R&D for high performance armor- heat sink joint were necessary to be implemented. In the R&D, the availability of the technology was demonstrated by high heat flux test of tungsten monoblock components. Not systematically but frequently macro-cracks appeared at the middle of monoblocks after 20 MW/m 2 loading. The initiation of such macro-cracks was considered to be due to cyclic exposure to high temperature, ∼20 0 0 °C, where creep, recrystallization and low cycle fatigue were concerned. To understand correlation between the macro-crack appearance and mechanical properties and possible update of acceptance criteria in the material specification, an activity to characterize the tungsten monoblocks was launched.
    Original languageEnglish
    Pages (from-to)616-622
    Number of pages7
    JournalNuclear Materials and Energy
    StatePublished - 18 Jul 2016

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