| 摘要 |
PURPOSE:To contrive the improvement in performance and the confirmation of security by exchanging the heat-insulating holder of different rigidity or heat-insulating performance according to the necessity by enabling the exchange of the heat-insulating holder and the use of a different heat-insulating holder at transportation or operation. CONSTITUTION:A superconductive coil 1 is arranged in a helium container 2 and is immersed in a liquid helium 7. The helium container 2 is held to a nitrogen container 3 by a heat-insulating holder 5 and the nitrogen container 3 is held to a heat-insulating vacuum container 4 by heat-insulating holder 6. The heat-insulating holder 6 is slidably fit in a hole 3a opened through the nitrogen container 3 and a hole 4a opened on a heat-insulating vacuum container holding seat 4A. The hole 4a is open to the atmosphere side; and on the holding seat plane, a flange for vacuum sealing 10 and a packing 11 are arranged. When the device is transported, the flange 10 is taken off and the holder is exchanged into a transportation holder having higher rigidity, whereas, in operation, that is exchanged into the heat-insulating holder 6 of lower rigidity and high heat insulating performance. |
