Low resolution NMR magnets, in the 23 to 35 T range at the NHMFL

The National High Magnetic Field Laboratory in 'Tallahassee, FL, USA has for several years provided low resolution NMR magnets to the condensed matter physics community. There e that in a provides 24.5 T in a 32 mm bore with inhomogeneity of about 100 ppm over a 10 mm Diameter Spherical Volume (DSV) and another that provides 25 T in 52 mm bore with inhomogeneity of 12 ppm over a I cm DSV. 0 The NHMFL is presently constructing the third magnet in this series that should provide field above 29 T with inhomogeneity less than 50 ppm over a I cm DSV. The NHMFL is also planning to build a series-connected hybrid to enable low resolution NMR in the 35 T range. History of the existing magnets and design of the 29 T magnet are presented along with. analysis and conceptual design of magnets with uniformity in the 1 ppm range and fields in the 35 T range.