Author/Authors :
Libeyre، نويسنده , , P and Brosset، نويسنده , , C and Decool، نويسنده , , P and Rubino، نويسنده , , M and Bevilacqua، نويسنده , , G and Laurenti، نويسنده , , A and Pesenti، نويسنده , , P and Ursuleac، نويسنده , , M and Valle، نويسنده , , N and Nyilas، نويسنده , , A، نويسنده ,
Abstract :
The central solenoid and toroidal field coils of ITER are designed with cable-in-conduit Nb3Sn superconducting conductors jacketed with Incoloy 908. This material, developed to limit the critical current degradation of the Nb3Sn 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.
