Joining technology and material and shape optimization for the ICRF vacuum transmission line dielectric window

Pertti Auerkari, Liisa Heikinheimo, Jukka Heikkinen, Juha Linden, Markku Kemppainen, K. Kotikangas, S. Nuutinen, Seppo Orivuori, Markku Peräniitty, Samuli Saarelma, M. Sirén, Seppo Tähtinen, Frej Wasastjerna, G. Bosia, Elizabeth Hodgson

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    The choice of dielectric material for the (double) dielectric window of the ITER ICRF Transmission Line is optimized with respect to nuclear, mechanical, and thermal properties. Neutron fluence at the window placed in the vacuum vessel feedthrough is obtained with MCNP-4 to be sufficiently small for allowing beryllia, but not alumina without additional neutron shielding, to be used as dielectrics. For beryllia (10−3 dpa) or for unirradiated alumina, the temperature is found to stay between the cooling temperature and 200°C with maximum hoop stress less than 100 MPa, provided titanium, niobium or materials with similar thermal expansion coefficients are used as support. Based on experimental vacuum tightness and shear strength tests for alumina-titanium joints, three potential brazing filler metals have been identified for bonding.
    Original languageEnglish
    Title of host publicationFusion Technology 1996
    Subtitle of host publicationProceedings of the 19th Symposium on Fusion Technology
    EditorsC. Varandas, F. Serra
    Place of PublicationAmsterdam
    ISBN (Print)978-0-444-59975-9
    Publication statusPublished - 1997
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventFusion Technology 1996: 19th Symposium on Fusion Technology - Lisbon, Portugal
    Duration: 16 Sept 199620 Sept 1996


    ConferenceFusion Technology 1996


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