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To meet critical current density, J$_c$, targets for the Future CircularCollider (FCC), the planned replacement for the Large Hadron Collider (LHC),the high field performance of Nb$_3$Sn must be improved, but champion J$_c$values have remained static for the last 10 years. Making the A15 phasestoichiometric and enhancing the upper critical field H$_{c2}$ by Ti or Tadopants are the standard strategies for enhancing high field performance butdetailed recent studies show that even the best modern wires have broadcomposition ranges. To assess whether further improvement might be possible, weemployed EXAFS to determine the lattice site location of dopants in modernhigh-performance Nb$_3$Sn strands with J$_c$ values amongst the best so farachieved. Although Ti and Ta primarily occupy the Nb sites in the A15structure, we also find significant Ta occupancy on the Sn site. These findingsindicate that the best performing Ti-doped stand is strongly sub-stoichiometricin Sn and that antisite disorder likely explains its high average H$_{c2}$behavior. These new results suggest an important role for dopant and antisitedisorder in minimizing superconducting property distributions and maximizinghigh field J$_c$ properties.

Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb$_3$Sn Superconductor Wires