Title :
Development of a Nb3Sn conductor containing Ga and Mg dopants
Author :
Rudziak, Mark K. ; Wong, Terence
Author_Institution :
Supercon Inc., Shrewsbury, MA, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
Future high energy physics accelerators and fusion machines will require superconducting magnets generating fields of 12 T and above. These magnets will most probably utilize Nb3Sn superconductor, since Nb3Sn-based conductors are a proven technology. The high-field performance of Nb3Sn-based conductors can be improved through the use of dopants. Among the elements that have been investigated as potentially beneficial dopants for Nb3Sn are Ga and Mg. Ga has been shown to increase both the critical temperature and upper critical field of Nb3Sn, while Mg has been reported to provide grain refinement, which is essential for high critical current density. Supercon has recently investigated a method for improving high field critical current density in bronze-route Nb3Sn through the simultaneous addition of Ga and Mg dopants. The results of the investigation, including critical current density and critical temperature data, are presented and the performance of the doped conductors is evaluated in comparison to an un-doped control
Keywords :
alloying additions; critical current density (superconductivity); gallium alloys; grain refinement; grain size; magnesium alloys; niobium alloys; superconducting critical field; superconducting transition temperature; tin alloys; type II superconductors; Ga dopants; Mg dopants; Nb3Sn; Nb3Sn conductor; Nb3Sn superconductor; Nb3SnGaMg; bronze-route Nb3Sn; critical temperature; grain refinement; high critical current density; high-field performance; superconducting magnets; upper critical field; Accelerator magnets; Conductors; Critical current density; Fusion power generation; Grain boundaries; Grain size; Niobium; Niobium-tin; Superconducting magnets; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
