Hybrid magnet design consisting of a 20 T superconducting outsert and a 15 MW resistive insert

K. Watanabe, S. Awaji, H. Oguro, K. Takahashi, K. Minegishi, T. Suwa, Y. Sasaki, T. Kiyoshi, T. Asano, S. Hanai, H. Tsubouchi, I. Inoue

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11 Citations (Scopus)


Internally reinforced Nb 3Sn strands with CuNb-reinforcing stabilizer CuNb/Nb 3Sn)$ have been developed for realizing a compact high-field superconducting magnet. The Rutherford flat cables composed of sixteen strands were made with a 0.8 mm diameter CuNb/Nb 3Sn strand. The designed critical current of the CuNb/Nb 3SnRutherford flat cable is I c=1890\ A at 13 T and 4.2 K in case of an ordinary heat-treatment at 670°C for 96 h, which is two times higher than an operation current desired for safety margin. In addition, mechanical characteristics for CVD-processed YBa 2 Cu 3 O 7 (YBCO) coated-conductor tapes were measured at 4.2 K in fields up to 18 T. It was found that YBCO tape exhibits the irreversible strain 0.5% and the irreversible stress 1140 MPa for the critical current at 4.2 K and 18 T for. The cabling-and-react+prebending-processed CuNb/Nb 2Sn Rutherford flat cables and CVD-processed YBCO tapes will be used as a react-and-wind method for the development of a 20 T superconducting magnet with a wide room temperature bore. We design a 20 T-440 mm warm-bore superconducting magnet consisting of YBCO inner coils, Nb 3Sn middle coils, and NbTi outer coils, which has the coil parameters of inner diameter 480 mm, outer diameter 1283 mm, and coil height 1302 mm. Since the coil inductance is estimated to be 232 H, the magnetic stored energy is 94 MJ at an operation current 900 A. An energy-saving 47 T hybrid magnet can be constructed in combination with a wide-bore 20 T superconducting outsert and a 15 MW-27 T water-cooled resistive insert.

Original languageEnglish
Article number6069569
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2012


  • CuAg bitter plate
  • hybrid magnet
  • Nb Sn Rutherford flat cable
  • wide-bore superconducting magnet
  • YBCO insert coil


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