Resistive Shimming Advancements for High Homogeneity Magnets in MagLab's DC Magnet User Program

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Learn about the innovative resistive shim technology for achieving unparalleled magnetic field homogeneity at high field strengths. The Series-Connected Hybrid Magnet (SCH) project at MagLab is pushing boundaries in magnetic field generation with exceptional homogeneity levels. Water-cooled shim coils are developed to enable 1 ppm homogeneity over a 10 mm diameter spherical volume. The prototypes tested in the Keck magnet achieved a world-record 5.6 ppm homogeneity at 25 T. This technology is pivotal for advancing NMR magnets using high-temperature superconductors to operate at 30 T and beyond.

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Feb 28, 2025

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Resistive Shimming Advancements for High Homogeneity Magnets in MagLab's DC Magnet User Program

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Resistive Shimming for Higher Homogeneity Magnets in the MagLab’s DC Magnet User ProgramMark D. Bird, Florida State University, DMR 0603042 The Series-Connected Hybrid Magnet (SCH) being developed at the MagLab will provide an unprecedented magnetic field of 36 T with 1 ppm homogeneity over a 10 mm diameter spherical volume (DSV). To accomplish this level of homogeneity at such a high field, new water-cooled shim coils are being developed (above). Prototypes recently tested in the MagLab’s Keck magnet successfully demonstrated a world-record value of 5.6 ppm over 10 mm DSV at 25 T (left). After being implemented in the SCH magnet for DC Magnet users, this resistive shim technology will help enable the next generation of NMR magnets proposed to use high-temperature super-conductors to operate at 30T and above

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