IMPROVEMENT OF THE DUCTILITY OF FINE FILAMENTARY SUPERCON- DUCTING SUPER COLLIDER AND OTHER APPLICATIONS

VERY SIGNIFICANT IMPROVEMENTS IN THE PROPERTIES OF FINE FILAMENTARY NBTI HAVE BEEN ACHIEVED RECENTLY, LARGELY AS A RESULT OF ATTEMPTS TO MEET THE REQUIREMENTS OF THE SUPERCONDUCTING SUPER COLLIDER (SSC). THESE IMPROVEMENTS HAVE, IN SOME CASES, BEEN ACCOMPANIED BY A REDUCTION IN DUCTILITY AND A REDUCED PIECE LENGTH IN THE WIRES EXHIBITING THE VERY HIGHEST CURRENT DENSITIES (J(C)). ALSO,WHEN MANY WIRES WITH EXCELLENT PROPERTIES ARE CABLED, SIGNIFICANT DEGRADATION OCCURS. SOME OF THE POSSIBLE REASONS FOR THE REDUCED MECHANICAL PROPERTIES HAVE BEEN IDENTIFIED, AND THE PHASE I AND EARLY PHASE II WORK WILL BE DIRECTED TOWARD A DETERMINATION OF THEIR RELATIVE IMPORTANCE. ONCE THE MOST SIGNIFICANT CAUSES FOR THE REDUCED DUCTILITY HAVE BEEN DETERMINED, THE LATER PHASE II WORK WILL CONSIST OF MODIFICATIONS TO THE MANUFACTURING PROCEDURES IN ORDER TO IMPROVE THIS PROPERTY.