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We present an extensive irradiation study involving five state-of-the-artNb3Sn wires which were subjected to sequential neutron irradiation up to a fastneutron fluence of 1.6 * 10^22 m^-2 (E > 0.1 MeV). The volume pinning force ofshort wire samples was assessed in the temperature range from 4.2 to 15 K inapplied fields of up to 7 T by means of SQUID magnetometry in the unirradiatedstate and after each irradiation step. Pinning force scaling computationsrevealed that the exponents in the pinning force function differ significantlyfrom those expected for pure grain boundary pinning, and that fast neutronirradiation causes a substantial change in the functional dependence of thevolume pinning force. A model is presented, which describes the pinning forcefunction of irradiated wires using a two-component ansatz involving apoint-pinning contribution stemming from radiation induced pinning centers. Thedependence of this point-pinning contribution on fast neutron fluence appearsto be a universal function for all examined wire types.

Effects of Neutron Irradiation on Pinning Force Scaling in State-of-the-Art Nb3Sn Wires