HIGH-FIELD GENERATION USING SILVER-SHEATHED BSCCO CONDUCTOR

A J(c) (77 K) of a 1200 m long silver-sheathed bismuth-based supercond ucting 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 m m bore BSCCO magnet generated 4 T at 4.2 K, 3 T at 21 K, and stably ge nerated 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 magn etic field properties of another BSCCO magnet having a 40 mm winding b ore 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.