Development of Bronze-Processed Nb3Sn Superconductors for 1GHz NMR Magnets
To realize a 1GHz NMR magnet, superconductors with such features as high critical current, high n-value, high strength, enough weight of a continuous spool and so on are required. Two types of bronze-processed Nb3Sn superconductors have been developed. One is the conductor for the inner coil with high critical current density (overall Jc) of over 100 A/mm2 and n-value of over 20 at 21 T, 1.8 K, the other is the Ta reinforced conductor for the middle field coils with high yield strength of over 300 MPa at 4.2 K and the spool weight of more than 60 kg. Details of characteristics for these conductors are reported including overall Jc, n-value and mechanical properties.
KeywordsCritical Current Density High Yield Strength High Critical Current Density Cryogenic Engineer Bronze Matrix
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