Abstract
We fabricated pancake type coils with dimension of 20 mmφ (bore) × 94 mmφ (outer diameter) using Bi-2212/Ag tapes. Bi-2212/Ag tapes were prepared by the combination of a continuous dip-coating process and melt-solidification, and the coils were fabricated by the wind and react method and fixed with epoxy resins. Two coils were stacked and connected in series to construct a magnet. The magnet was tested in bias fields up to 20 T and at temperatures up to 40 K. This magnet generated a magnetic field of 2.6 T (I c′ , = 385 A (10 −13Ω m)) under zero bias field, 1.08 T (I c′ , = 160 A (2 × 10 −13 Ω m under a bias field of 20 T in liquid helium. At about 20 K, the generated field of the magnet was 1.53 T (I c′ , = 225 A (10 −13Ω m)) . The results suggest that a Bi-2212 coil is promising as an insert magnet of a high-field superconducting magnet system. The Bi-2212 coil is also expected to operate as a cryogen-free magnet which can be operated at ~20 K with cryocooler.
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