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

T. Baumgartner; M. Eisterer; H. W. Weber; R. Flükiger; C. Scheuerlein; L. Bottura

doi:10.1038/srep10236

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arXiv · 1504.05366

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

T. Baumgartner·M. Eisterer·H. W. Weber·R. Flükiger·C. Scheuerlein·L. Bottura

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Abstract

We report non-Cu critical current densities of 4.09 * 10^9 A/m^2 at 12 T and 2.27 * 10^9 A/m^2 at 15 T obtained from transport measurements on a Ti-alloyed RRP 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, and they correspond to a Jc enhancement of approximately 60% relative to the unirradiated state. Our magnetometry data obtained on short wire samples irradiated to fast neutron fluences of up to 2.5 * 10^22 m^-2 indicate the possibility of an even better performance, whereas earlier irradiation studies on bronze-processed Nb3Sn wires with a Sn content further from stoichiometry attested a decline of the critical current density at such high fluences. We show that radiation induced point-pinning centers rather than an increase of the upper critical field are responsible for this Jc enhancement, and argue that these results call for further research on pinning landscape engineering.

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T. Baumgartner, M. Eisterer, H. W. Weber, R. Flükiger, C. Scheuerlein, L. Bottura. 2015-04-21. Performance Boost in Industrial Multifilamentary Nb3Sn Wires due to Radiation Induced Pinning Centers. https://doi.org/10.1038/srep10236

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