Abstract This paper presents the manufacture process of the Nb 3 Sn coils for a 14 T animal MRI magnet. The magnet consists of two NbTi-CuNi reinforced bronze-processed Nb 3 Sn solenoid coils, which contribute 6.6 T to the central magnetic field. The manufacture process of the Nb 3 Sn coils includes the following steps: bobbin design, coil winding, heat treatment, epoxy impregnation, binding installation, superconducting joint fabrication, and bobbin removal. The coil bobbin is designed with a draft angle and a liquid nitrogen chamber. Decarbonized fiberglass cloth is wrapped between coil layers during winding. A heat treatment tooling is designed and utilized to control the dimensions and positions of the Nb 3 Sn coils after heat treatment. The epoxy resin used for impregnation is CTD-101K, and a 6061-T6 aluminum cylinder is utilized as the binding for Nb 3 Sn coils. Superconducting joints are fabricated by the solder matrix replacement method. Finally, the bobbin is removed from the coils using liquid nitrogen and hydraulic jacks.
Jiang et al. (Tue,) studied this question.
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