| 摘要 |
PURPOSE:To obtain a rigid floor structure using a simple superconducting shield body and a cryostat structure and, at the same time, to stably put men and articles (materials, devices, etc.) in a space of very weak magnetic field with a simple structure. CONSTITUTION:A cylindrical structure 13 is formed of a cylindrical superconducting shield body 11 and cryostat 12 convering the internal and external surfaces of the body 11 and the structure 13 is vertically set with the opening 13a of the structure 13 down. A floor member 15 composed of a nonmagnetic material is put in the structure 13 and multiple ring-like cylindrical members 16a, 16b, and 16d composed of a material having a high permeability are concentrically arranged in the opening 13a of the structure 13. |
