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The magnetic field stability such as relaxation and a magnetic field hysteresis of a practical 20-T cryogen-free superconducting magnet (20 T-CSM) with a Bi2Sr2Ca2Cu3Oy (Bi2223) insert coil was investigated. The relaxation of a central magnetic field is basically related to the flux creep phenomena in the magnetization of the Bi2223 tapes. We found that the relaxation rate $S$ of the magnet is more...
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