title: Performance Boost in Industrial Multifilamentary Nb3Sn Wires due to Radiation Induced Pinning Centers.
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.
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: T
authors.initials: T
authors.lastname: Baumgartner
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Eisterer
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: H W
authors.initials: HW
authors.lastname: Weber
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Flükiger
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Scheuerlein
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Bottura