Special purpose high field resistive magnets

Since 1994 the National High Magnetic Field Laboratory in Tallahassee, FL has built numerous high field DC magnets for condensed matter physics and other research. Our user community is now requesting various special purpose high field magnets that are at various stages of design and development. Concepts under consideration include the following: 1) AC modulation (0.1 T AC to 100 Hz) at 27 T DC for dc Haas van Alphen; 2) AC gradient (0.05 T/cm) at 27 T DC for force magnetometry, 3) >20 T radial access magnet for two angle rotation, 4) 18 cm bore high field*field gradient magnet for levitation of large samples and 5) 50 mm bore magnet with uniform field*field gradient for precision levitation. Design concepts. field magnitude and quality, stresses, power densities and construction status will be presented for these various systems.