| 摘要 |
PURPOSE:To contrive reduction of noise by a method wherein the inclined magnetic field coil, equipped with the sound-insulating case of the inclined magnetic field coil formed using a normal temperature coil as an outer cylinder and an inner cylinder of non-magnetic material as a spool, is fixed to the outer circumferential surface of the spool through the intermediary of a vibration-proof supporting member. CONSTITUTION:A sound-insulating container 21, in which an inclined magnetic field coil 12 is housed, is used as the outer cylinder of the normal temperature bore tube 3A of a cryostat 2, and an inner cylinder 22 made of non-megnetic is airtightly formed as the spool of the inclined magnetic field coil 12. Also, the inclined magnetic field coil 12 is elastically supported by the inner cylinder 22, which is a spool, through the intermediary of the vibration-proof supporting member 24 such as an elastic material, a spring material and the like. Accordingly, the propagation to the sound- insulating container of mechanical vibrations generated on the inclined magnetic field coil 12 is prevented by the vibration-proof supporting member 24, and the transmission to outside of the sound wave emitted from the inclined magnetic field coil 12 is prevented by a sound-insulating case 21. As a result, the inclined magnetic field coil 12 can be brought into the state of low noise. |
