SUPERCONDUCTING MAGNETIC SHIELD

• Main Authors: SHIRAKU YOSHINORI, OGATA HISANAO, ISHIKAWA YUICHI, NAKAMURA YOZO
• Format: Patent
• Language: English
• Published: 28.10.1988
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS

PURPOSE:To easily provide a complicated space of a large capacity and low residual magnetism shielded from the external magnetic field at a temperature not exceeding the critical temperature of superconduction, by a method wherein a compound body is formed by laminating the surface of high temperature superconductive fine powder layer with plastics. CONSTITUTION:A superconductor magnetism shield is composed of at least one layer of compound body comprising high temperature super conductive fine powder layer 2 formed into a sheet or tape laminated with plastics 3 or rubber. A recommended material for the high temperature superconductive material powder is a compound in the perovskite type crystal structure containing copper and oxygen. Furthermore, it is recommended that the surface, rear and both sides of this compound body are laminated with a metallic foil while permalloy of high permeability and aluminium or copper of high conductivity are optimum for the metallic foil to be laminated. The high temperature superconductive fine powder can shield the external magnetic field by the Meissner effect of superconductor. Thus, more intensive magnetic field can be shielded by laminating the compound body layers repeatedly.