| 摘要 |
PURPOSE:To obtain a magnetic field generating device which is high in its reliability and capable of generating a stable magnetic field, by installing magnets which generate the magnetic field and disposing superconductive rings which are used to form an induced current from the magnetic field generated by these magnets and to generate a magnetic field. CONSTITUTION:First and second oxide superconductive rings I22 and II23, which are disposed in cryogenic regions 21 and inside coils 3-5 and have liquid nitrogen as a cryogen, are installed to face the respective coils 3-5 which compose magnets. Since the oxide superconductive rings 22 and 23 are disposed to cross a magnetic flux generated by the superconductive coils 3-5, a generated magnetic field does not almost attenuate and so a magnetic field generating device of high stability can be obtained. Further, the superconductive rings 22 and 23 are disposed in the regions separate from the superconductive coils 3-5, weight of the superconductive coils to be cooled on their installation regions does not increase and so the coils can be cooled easily by the use of an inexpensive device. |
