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In this work, the transport and magnetization properties ofdistributed-barrier Rod-in-Tube (RIT) strands and Tube Type strands arestudied. While Tube Type strands had smaller magnetizations and thus betterstabilities in the low field region, their 12 T non-Cu Jcs were somewhatsmaller than those of the RIT strands. Microstructures were investigated inorder to find out the reasons for the difference in non-Cu Jc values. Theirgrain size and stoichiometry were found to be comparable, leading to similarlayer Jcs. Accordingly it was determined that the lower A15 area fractionrather than the quality of A15 layer was the cause of the discrepancy in non-CuJc. Subsequently, the area utilizations of subelements were investigated. Whilefor a RIT strand the fine grain (FG) A15 area occupies ~60% of a subelement,for a Tube Type strand it is no more than 40%. Further analysis indicates thatthe low FG area fraction in a Tube Type strand is attributed to its much largerunreacted Nb area fraction. Finally, a simple change in strand architecture isproposed to reduce the unreacted Nb area fraction.

Critical current densities and microstructures in Rod-in-Tube and Tube Type Nb3Sn strands - Present status and prospects for improvement