Recent Development of SSC Cable in Furukawa
After the First International Industrial Symposium on the Super Collider, the following developmental work on NbTi superconducting Rutherford cable for the Superconducting Super Collider (SSC) was done at Furukawa Electric. (1) Improvement in the critical current density of the SSC wire, based on volume production: The manufacturing process enabling us to achieve the critical current density of more than 3,000 A/mm2 at 5 T is being established. (2) Development of large keystone angled cable to be used for modified SSC dipole magnets: Critical current degradation due to cabling is nearly proportional to cross-sectional area reduction of strands. A 5-cm bore, 1-m long dipole magnet having no wedge inside the coils was fabricated by using the large keystone angled cable and successfully tested by KEK. (3) Magnetization measurements on the SSC wire samples: The long term magnetization decay imposing a serious problem in the accelerator design is possibly associated with flux creep phenomenon occurring in a proximity-coupled matrix between NbTi filaments.
KeywordsDipole Magnet Critical Current Density Heat Treatment Time Filament Diameter High Critical Current Density
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