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The central solenoid and toroidal field coils of ITER are designed with cable-in-conduit Nb(3)Sn superconducting conductors jacketed with Incoloy 908. This material, developed to limit the critical current degradation of the Nb(3)Sn strands, shows excellent mechanical properties at 4 °K, particularly under cycling. Nevertheless, it is a crack prone material when heat treated in the presence of oxygen, which requires careful control of the atmosphere during manufacture. A programme of extensive mechanical testing of samples and manufacture of a pancake with incoloy conductor jacket was carried out in Europe. The origin of cracks in the incoloy jacket after heat treatment was investigated.

Additional information

Authors: LIBEYRE P ET AL, Association Euratom/CEA, CEA/Cadarache, Saint-Paul lez Durance (FR);BEVILACQUA G, EFDA-CSU, Garching (DE);LAURENTI A ET AL, AGAN Consortium, Genoa (IT);NYILAS A, Association Euratom - Forschungszentrum Karldruhe (DE)
Bibliographic Reference: An article published in: Fusion Engineering and Design, 58-59 (2001), pp. 129-134.
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