Abstract
Performance of a Bi-2223 superconducting magnet consisted by ten double-pancake coils was improved by using iron plates (SS400) for top and bottom flanges. The magnetic field dependence of the critical current density of Bi-2223 tape for magnetic field normal to the tape was determined the maximum magnetic field of the magnet. Hence, a reduction of the normal component of the magnetic field to the tape was achieved by using the iron plates. The magnetic field distribution in the magnet was calculated by a finite element method, and the reduction of the normal magnetic field component was confirmed. The maximum magnetic field at the center of the magnet bore reached 1.30 T at 65.0 K of subcooled liquid nitrogen and 0.70 T at 77.3 K. These values were about 1.6 times higher than the previous magnet and agreed well with the calculated result.
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