High field generation using silver-sheathed BSCCO conductor

Abstract

A J c (77 K) of a 1200 m long silver-sheathed bismuth-based superconducting wire has reached 10 900 A/cm 2. The performance of application prototypes has also got a great deal of progress. For example, a 60 mm bore BSCCO magnet generated 4 T at 4.2 K, 3 T at 21 K, and stably generated 2.5 T at 21 K for over 150 h when cooled with GM refrigerator. This magnet has a practical-sized winding bore of 60 mm, and a 40 mm RT bore cryostat was installed for actual application. Also. high magnetic field properties of another BSCCO magnet having a 40 mm winding bore were evaluated with a backup field up to 22.54 T at 4.2 and 27 K. The maximum fields generated by a backup hybrid magnet and BSCCO coil was 24.0 and 23.4 T at 4.2 and 27 K, respectively.