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We report non-Cu critical current densities of 4.09 * 10^9 A/m^2 at 12 T and2.27 * 10^9 A/m^2 at 15 T obtained from transport measurements on a Ti-alloyedRRP Nb3Sn wire after irradiation to a fast neutron fluence of 8.9 * 10^21 m^-2.These values are to our knowledge unprecedented in multifilamentary Nb3Sn, andthey correspond to a Jc enhancement of approximately 60% relative to theunirradiated state. Our magnetometry data obtained on short wire samplesirradiated to fast neutron fluences of up to 2.5 * 10^22 m^-2 indicate thepossibility of an even better performance, whereas earlier irradiation studieson bronze-processed Nb3Sn wires with a Sn content further from stoichiometryattested a decline of the critical current density at such high fluences. Weshow that radiation induced point-pinning centers rather than an increase ofthe upper critical field are responsible for this Jc enhancement, and arguethat these results call for further research on pinning landscape engineering.

Performance Boost in Industrial Multifilamentary Nb3Sn Wires due to Radiation Induced Pinning Centers