CURRENT DENSITY MULTIFILAMENT SUPERCONDUCTING NB3SN COMPOSITE

FUTURE ACCELERATORS CONSTRUCTED FOR THE HIGH ENERGY PHYSICS PROGRAM WILL BE VERY LARGE; THE PROPOSED SUPERCONDUCTING SUPER COLLIDER (SSC) WILL HAVE A CIRCUMFERENCE BETWEEN 90 AND 140 KM. THE SIZE AND COMPLEXITY OF THESE LARGE MACHINES CAN BE REDUCED IF HIGHER MAGNETIC FIELD AND HIGHER CRITICAL TEMPERATURE DIPOLE MAGNETS CAN BE DEVELOPED. DIPOLE MAGNET DESIGNERS ARE SEARCHING FOR HIGHER CRITICAL CURRENT-DENSITY SUPERCONDUCTORS THAT ALSO HAVE VERY FINE SUPERCONDUCTOR FILAMENTS TO MINIMIZE THE HYSTERETIC EFFECTS AT LOW MAGNETIC FIELDS. THIS PROGRAM AIMS TO DEVELOPE A MANUFACTURING PROCESS THAT INTEGRATES THE ADVANTAGES OF NB3SN CONDUCTOR MANUFACTURED VIA THE "INTERNAL TIN" PROCESS (EXCELLENT WIRE-DRAWING CHARACTERISTIC AND FINE FILAMENTS) AND THE "NIOBIUM TUBE" PROCESS (HIGHER CUR- RENT DENSITY).