Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb₃Sn Superconductor Wires.

ABSTRACT: To meet critical current density, J _c , targets for the Future Circular Collider (FCC), the planned replacement for the Large Hadron Collider (LHC), the high field performance of Nb₃Sn must be improved, but champion J _c values have remained static for the last 10 years. Making the A15 phase stoichiometric and enhancing the upper critical field H _c2 by Ti or Ta dopants are the standard strategies for enhancing high field performance but detailed recent studies show that even the best modern wires have broad composition ranges. To assess whether further improvement might be possible, we employed Extended X-ray Absorption Fine Structure (EXAFS) to determine the lattice site location of dopants in modern high-performance Nb₃Sn strands with

SUBMITTER: Heald SM 

PROVIDER: S-EPMC5859093 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature