Variation of Tc, lattice parameter and atomic ordering in Nb3Sn platelets irradiated with 12MeV protons: correlation with the number of induced Frenkel defects

Article Article scientifique Article Variation of Tc, lattice parameter and atomic ordering in Nb3Sn platelets irradiated with 12MeV protons: correlation with the number of induced Frenkel defects eng 2017 author Flukiger René-Louis 25218 author Spina Tiziana 770951 author Cerutti Fernanda 562500 author Ballarino A author Scheuerlein C author Bottura L author Zubavichus Y author Ryazanov A author Svetogovov R D author Shavkin S author Degtyarenko P author Semenov Y author Senatore Carmine 0000-0002-9191-5016 561307 author Cerny Radovan 28214 054003 10.1088/1361-6668/aa64ee 0953-2048 http://iopscience.iop.org/article/10.1088/1361-6668/aa64ee/meta Nb3Sn platelets with thicknesses between 0.12 and 0.20 mm produced by a high isostatic pressure process at 1250 °C were irradiated at 300 K with 12 MeV protons. The effects of irradiation on the lattice parameter a, the atomic order parameter S and the transition temperature Tc were measured as a function of proton fluence. In view of the presence of multiple energy radiation sources in future accelerators, the present proton data are compared with neutron irradiation data from the literature. The fluences for both types of radiation were replaced by the dpa number, the ‘displacements per atom', calculated using the FLUKA code, which is proportional to the number of radiation induced Frenkel defects. It was found that the variation of both a and S for Nb3Sn after proton and neutron irradiation as a function of dpa fall almost on the same curve, in analogy to the recently reported correlation between Tc and the dpa number. By a simultaneous irradiation of two adjacent thin Nb3Sn platelets, we have shown that this correlation is not only valid for the state of ‘steady energy loss' (protons traveling through the first platelet) but also for the state of higher damage at the Bragg peak (second platelet). It follows that the number of radiation induced Frenkel defects in the A15 grains, calculated via the dpa number, can be considered as a ‘universal' parameter, allowing the calculation of the variation of Tc, a and S of Nb3Sn under the effect of multiple high energy radiation sources, as in future superconducting accelerators. Nb3Sn Proton irradiation Superconducting properties Displacement per atom Dewey 500.2 33 Département de physique de la matière quantique 131 35 Groupe de physique appliquée 135 false 806 Groupe Cerny 679 Groupe Senatore Superconductor Science and Technology 30 5 749a43d5-f2f0-430e-9098-2bdcf14dbce4 Article (Published version) Restricted Reprint.pdf 2793675 application/pdf restrictedAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique Faculté des sciences / Section de physique / Groupe de physique appliquée

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Variation of T_c, lattice parameter and atomic ordering in Nb₃Sn platelets irradiated with 12MeV protons: correlation with the number of induced Frenkel defects	Superconductor Science and Technology			2017	531	2

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