Advanced Designs for Enhanced Thermo-Magnetic Stability in High <i>J_c </i> Nb₃Sn Wires

The DT design provides high <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">J_c</i> through uniform tin distribution, while the DB design enhances mechanical strength and thermal stability. The hybrid design, known as the Distributed Barrier Strand (DBS), balances these properties, significantly improving thermo-magnetic stability while maintaining high <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">J_c</i>. The wires were fabricated using the internal tin process and underwent a multi-stage heat treatment to form the Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn phase. Evaluations of various designs in terms of critical current density (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">J_c</i>), thermo-magnetic stability, strain tolerance, and mechanical properties revealed that the DBS hybrid design exhibited higher stability and performance compared to the individual DT and DB designs. This research offers key insights into the design and fabrication of Nb<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>Sn superconducting wires and has important implications for high-performance applications.