強磁場科学用冷凍機冷却超電導マグネットの開発

概要

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We have developed a cryocooled superconducting magnet for the 28 T hybrid magnet. The liquid helium-free hybrid magnet has been designed to generate the magnetic field of 28 T that can be accomplished by combining 9 T generation due to the cryocooled superconducting magnet with 19 T generation due to a water-cooled resistive magnet, which is inserted into a room bore of the superconducting magnet. In this work, we developed the 10 T cryocooled superconducting magnet with the 360 mm room bore, whose inner coils are wound for employing high-strength Nb_3Sn wires in consideration of large hoop stress. The liquid helium-free hybrid magnet has reached the generation of 27.5 T, which is greatly useful for high magnetic field science. The hybrid magnet also achieved the high magnetic-force field (B- dBz/dz) of 4500 T^2/m, which could levitate materials of small magnetic susceptibility such as an InSb semiconductor.
2007-07-01