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The first cryogen-free 23 T hybrid magnets, consisting of an outer wide bore cryogen-free superconducting magnet and an inner water-cooled resistive magnet are constructed. The wide bore cryogen-free superconducting magnet is investigated to generate a central field of 6.0 T in a 360 mm room temperature bore.

A cryo-cooled large magnetic field gradient superconducting magnet as the insert magnet for a large bore cryo-cooled superconducting magnet is developed in order in order to study magnetic levitation. The findings indicate that this cryo-cooled magnet system quenched from the insert magnet, but could achieve nearly 1050 T(sub 2)/m.

Progress is reported involving construction of a cryogenfree hybrid magnet at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, in Japan.

A cryogen-free 23 T hybrid magnet is described. The device is being built at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai, Japan.

Bi(Pb)223 bulks were prepared using magnetic melt processing and oriented crystal growth was observed.

A large scale Bitter magnet was built and applied to crystal growth in levitating water.

The High Field Laboratory for Superconducting Materials at Tohoku University is discussed with regard to the development of hybrid magnets.

Nb3Sn wires with CuNb reinforcing stabilizer cooled by refrigerator were investigated for future design of cryocooled superconducting magnets.

The use of a capacitor bank of 60 kJ energy as a power supply in the development of a Bitter type magnet with three layer structure.

The use of Bi-system high temperature superconducting current leads to realize a cryogenfree superconducting magnet is described.

A 10 T cryocooled large-bore superconducting magnet has been built with (Nb,Ti)3Sn wires with CuNb composite stabilizer. The wires have an outer diameter of 1 mm, a filament diameter of 4 micrometer and 7849 filament strands. The react and wind and a tension-winding method were used in constructing the magnet. This procedure enabled the use of a coil formation technique that does not employ a large-scale heat treatment furnace or of vacuum epoxy-impregnation equipment.

High field heat treatment equipment in an 11 T cryocooled superconducting magnet is used in the melt textured process in high magnetic fields when synthesizing YBa2Cu3O7 bulk samples. The texture in grain of the YBa2Cu3O7 matrix was found by the X-ray rocking curves of (005) and (006) to have improved through an application of a magnetic field of only a few tesla. It was also found that the application of a magnetic field of ... 10 T altered the distribution of Y2BaCuOx particles.

A compact superconducting magnet was developed for a 40 T hybrid magnet. Highly-strengthened Nb3Sn wires were used to fabricate the magnets with epoxy-impregnated layer winding. The magnet has 4.1 tons of total coil mass and exhibits 16 T in a 420 mm inner diameter of windings. About 40% of the conventional cryostabilized magnet wound with copper-matrix wire was achieved.

A study is conducted to investigate heat transfer in water by using a liquid-crystal sheet with thermochromism in a hybrid magnet. The result reveals that the temperature dependence of the magnetic susceptibility of water is responsible for the convection behavior in the gradient fields.