Tungsten and beryllium armour development for the JET ITER-like wall project

H. Maier, T. Hirai, M. Rubel, Ph. Mertens, H. Greuner, Ch. Hopf, G.F. Matthews, O. Neubauer, G. Piazza, E. Gauthier, J. Likonen, R. Mitteau, G. Maddaluno, B. Riccardi, V. Philipps, C. Ruset, C.P. Lungu, Inge Uytdenhouwen, Vincent Massaut

    Research outputpeer-review


    For the ITER-like wall project at JET, the present main chamber CFC tiles will be exchanged with Be tiles and in parallel a fully tungsten-clad divertor will be prepared. Three R&D programmes were initiated: Be coatings on Inconel as well as Be erosion markers were developed for the first wall of the main chamber. For the divertor a conceptual design for a bulk W horizontal target plate was investigated, with the emphasis on minimizing electromagnetic forces. The design consisted of stacks of W lamellae of 6mm width that were insulated in the toroidal direction. High heat flux tests of a test module were performed with an electron beam. No macroscopic failure occurred during the test while SEM showed the development of micro-cracks on the loaded surface. For all other divertor parts R&D was performed to provide the technology to coat the 2-directional CFC material used at JET with thin tungsten coatings. All coatings developed cracks perpendicular to the CFC fibres due to the stronger contraction of the coating upon cool-down after the heat load pulses.
    Original languageEnglish
    Pages (from-to)222-227
    JournalNuclear Fusion
    Issue number3
    StatePublished - Jan 2007

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