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

Abstract

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
PublisherElsevier
Pages787-790
Volume1
ISBN (Print)978-0-444-59975-9
DOIs
Publication statusPublished - 1997
MoE publication typeB3 Non-refereed article in conference proceedings
EventFusion Technology 1996: 19th Symposium on Fusion Technology - Lisbon, Portugal
Duration: 16 Sep 199620 Sep 1996

Conference

ConferenceFusion Technology 1996
CountryPortugal
CityLisbon
Period16/09/9620/09/96

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