Spallation and 14-MeV neutron irradiation of stabilized NbTi superconductors

The results on 5 K irradiation available are summarized as follows: (1) increases of j-sub c/ following neutron irradiation occur only in conductors which are far from the optimal metallurgical treatments, (2) The changes of j/sub c/ following neutron irradiation and a thermal cycle to room temperature are small and in most cases comparable to the results obtained after 77 K irradiation, (3) The data available so far indicate that the degradation of j/sub c/ at 8 T is larger by about 5 to 10% than the corresponding changes at 5 T at a neutron fluence of 1.3 x 10 22nd power m(+2) (E 0.1 MeV), (4) The increase of Cu resistivity is significant even after a thermal cycle to room temperature and requires design changes for a stable magnet operation.