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The extremely high magnetic fields offer significant advantages in improving imaging quality and analyzing the fine structures of materials. However, these benefits critically depend on achieving high levels of B0 magnetic field homogeneity. This necessitates the development of advanced shimming technologies, which can be effectively realized using superconducting shim coils. This paper presents the design and testing of a high-temperature superconducting shim coil system for a 27 T ultra-high-field superconducting magnet with a 30 mm DSV. The design includes four sets of shim coils—Z1, Z2, X, and Y—developed using the boundary element method. To ensure smooth and reliable connections, the independent conductor paths generated by the stream function method were linked using Bézier curves. The four shim coils were subsequently mounted onto alumina ceramic carriers, which were integrated into a shimming rod for placement and testing within the magnet. Bi-2212, the only high-temperature superconductor available as isotropic round-wire conductors, is uniquely suited for extremely high-field applications. Its use supports advanced superconducting homogenization and enables the development of next-generation NMR systems operating at 1.3 GHz and beyond.
