Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 33, Issue 5, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2023.3242919
Keywords
Critical current; distributed-tin method; Nb3Sn; strain impacts; Walters spring
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Nb3Sn superconducting wires are under consideration for producing high field accelerator magnets for the proposed Future Circular Collider (FCC) due to their high critical field. R & D studies are ongoing worldwide with a target non-Cu critical current density (J(c)) of 1500 A/mm(2) at 4.2 K, 16 T. As an accomplishment of this R & D, one of the conductor manufacturers, JASTEC, has developed Nb3Sn wires with non-Cu J(c) higher than 1100 A/mm(2) at 16 T, 4.2 K by a distributed-tin (DT) method. In high field Nb3Sn magnets, degradation of performance has been frequently reported due to the brittleness of Nb3Sn and the high electromagnetic force. To realize more robust Nb3Sn accelerator magnets, electro-mechanical properties of the conductors should be deeply understood. In this study, the variation of the critical current with mechanical loading is evaluated for a DT Nb3Sn wire in two configurations, i.e., under axial strain and under transverse compression.
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