SUPERCONDUCTING MAGNET DEVICE

摘要

PURPOSE:To enable a superconducting magnet device with a low running cost to be formed by allowing a low-temperature nitrogen which is vaporized by a liquid nitrogen container being provided on an upper portion of a liquid helium container to flow into a normal conducting lead part through a connecting pipe. CONSTITUTION:A current lead part 50 is constituted by a normal conducting lead part 51 which is connected through a hollow intermediate flange 53 and a superconducting lead portion 52 which consists of an oxide superconductor. The normal conducting lead portion 51 is provided with a path of a refrigerant gas inside and the intermediate flange 53 is connected to a liquid nitrogen container 14 through a connecting pipe 15. A vaporized low-temperature nitrogen gas 9G passes through a gas path within the normal conducting lead part and then is discharged toward outside from an exit 51B at a cold terminal side, thus enabling a current lead to be cooled. A synergistic effect of this temperature reduction and a low thermal conductivity of the oxide superconductor enables intrusion heat into a side of a superconducting coil 1 to be reduced drastically, thus enabling consumption of an expensive liquid helium 8 to be replaced by that of an inexpensive liquid nitrogen and hence a running cost of a superconducting magnet device to be reduced.