Title :
Heat treatment optimization of internal tin Nb3Sn strands
Author :
Barzi, Emanuela ; Gregory, Eric ; Pyon, Tae
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
The development of high critical current density (Jc) multifilamentary Nb3Sn strands with low magnetization is important for many technological applications, including construction of high field accelerator magnets. To achieve this goal, strand R&D is actively pursued by Fermilab and IGC using the internal tin process. The Jc of a Nb3Sn strand made with the internal tin technology depends on numerous factors, including Nb filament size and heat treatment cycle. Various heat treatments were applied to Nb3 Sn strands of different designs produced by IGC. The effect of filament size was studied both during the Nb3Sn layer growth and after complete reaction. The resulting Jc´s are presented, as well as SEM microscopy of strand sections
Keywords :
critical current density (superconductivity); heat treatment; materials preparation; multifilamentary superconductors; niobium alloys; optimisation; scanning electron microscopy; tin alloys; type II superconductors; Nb filament size; Nb3Sn; SEM; designs; filament size; heat treatment optimization; high critical current density; high field accelerator magnets; internal tin Nb3Sn strands; layer growth; magnetization; multifilamentary Nb3Sn strands; Accelerator magnets; Atmospheric measurements; Critical current density; Heat treatment; Magnetization; Niobium; Niobium-tin; Research and development; Scanning electron microscopy; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
