Miniaturized magnets for NMR above 50 tesla

• Homogeneity calculations for different magnet geometries • Ideas for shimming of the miniature HTS magnets • Extremely narrow NMR probes, cryostats, and magnet mandrels We propose small and simplified magnets above 50 Tesla for wide dissemination to the NMR community. High temperature superconductor (HTS) with high current densities readily provide a viable path to a new generation of magnets for NMR which are smaller, better, and cheaper. A key innovation we foresee is the reduction of NMR magnet mandrels (a.k.a. winding bobbins) from typically employed diameter of >100 mm to smaller than 15 mm. Conventional NMR probes are far too large in diameter to fit into such small magnet bores and are unfavorably long due to the distance from the homogenous region of the magnet to the edge of the bore. Instead, we envision narrow (