| 摘要 |
PURPOSE:To shield effectively a magnetic field to leak to the outside by a method wherein a cylindrical superconduction magnetic shielding body is constituted into a structure, wherein annular superconducting shielding bodies are respectively fixed annularly only on both end parts of the cylindrical superconducting magnetic shielding body and a superconducting layer, which is not formed into a shielding current loop about the axial center, is applied and formed on the peripheral surface of the drum part of the cylindrical superconducting magnetic shielding body. CONSTITUTION:A cylindrical superconducting magnetic shielding body is constituted into a structure, wherein a superconducting magnet 90 is internally provided in the hollow part of the shielding body to reduce a magnetic leakage to the outside. The superconducting magnetic shielding body 4 consists of one pair of end part shielding bodies 42, on which superconducting sheets 3 closed annularly on both end parts of the shielding body 4 are respectively fixed annularly, and a peripheral surface shielding body 41 with a piece-shaped superconducting sheet 1, which is provided on the peripheral surface of the center, part of the shielding body 4 closely at the region of the peripheral surface and so as to be unable to close annularly a superconductor. This shielding body 41 involves the magnet 90 roughly coaxially and an internal magnetic field space is formed between the shielding body 41 and the magnet 90. Thereby, a magnetic field to leak to the outside can be effectively shielded and at the same time, it can be easily done to design and manufacture freely the cylindrical superconducting magnetic shielding body having a large diameter. |
