Abstract
This is a preliminary report on a series of fusion neutron (14.8 MeV) irradiation studies on pure and alloyed multifilamentary Nb 3Sn superconductors at the Livermore Rotating Target Neutron Source RTNS-II. One set of specimens (2 pure Nb 3Sn and one alloyed — (Nb-1.2 wt% Ti) 3Sn — conductor) was irradiated in-situ at 14 K in 3 cycles up to a maximum fluence of 1.3 × 10 22 n/ m 2 (0.32 eV deposited damage energy) and T c and j c measured in magnetic fields up to 15.5 T. The critical parameters were also recorded after isochronal annealing cycles at 80, 180 and 300 K. Six identical sets including 3 additional wires (one pure liquid diffusion processed and 2 alloyed — (Nb-0.8 wt% Ti) 3Sn and (Nb-2.0 wt% Ti) 3Sn — conductors) were irradiated at room temperature at different positions from the source in order to accumulate approximately 2 ×, 1 ×, 1 2 , 1 4 , 1 8 and 1 16 of the maximum dose of the in-situ experiment. A comparison of the in-situ results with the room temperature irradiation data showed no significant differences in the behaviour of T c and j c as a function of neutron fluence and only small recovery effects were found after the isochronal anneals at the end of the in-situ experiment.
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