| 摘要 |
PURPOSE:To reduce heat generation in an inner chamber of a supercon-ductiving magnet and a superconducting coil and eliminate the amount of evaporation of refrigerant by a method wherein a radiation shield is composed of a material having low electric conductivity, and a member having high heat conductivity is arranged in a part of the radiation shield, and a cooling pipe is provided in a member having high heat conductivity. CONSTITUTION:A radiation shield 1 is composed of a member 2 having low electric conductivity, and a member 3 having high heat conductivity is divided and arranged on this surface. Further, a cooling pipe 4 is connected to the member 3 having high heat conductivity and placed. Thus, an eddy current generated in the radiation shield is suppressed, and the amount of heat generation can be made less in a superconductive coil and an inner chamber, and also a temperature gradient in the radiation shield itself is suppressed, whereby an invaded heat by the radiation can be reduced and the amount of evaporation of the refrigerant can be suppressed. |
