A superconducting spectrometer magnet for nuclear physics experiments is currently under construction. The magnet has a sector-type coil. The magnetic field is 3 T with a magnet gap of 50 cm, and the stored energy is 11.8 MJ. Ease of operation and maintenance are taken into consideration in the design. Three-dimensional magnetic field calculations and the stress analysis have been performed. The code QUENCH was applied to determine the operating current and check coil safety. A current of 500 A was selected. Heat leaks were checked and estimated to be >2 W at 4 K. A small refrigerator is to be used for thermal insulations at 80 and 20 K.
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