| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of controlling a superconductor magnetic field application apparatus, that is capable of forming a static magnetic field which is as strong as a conventional superconducting magnet, without having to use a refrigerant (liquid helium) which is indispensable for the operation of a conventional superconducting magnet and stably keeping the static magnetic field constant in magnetic flux density over a long term, a nuclear magnetic resonance apparatus using this method, and a superconducting magnet apparatus. SOLUTION: This method is to control a nuclear magnetic resonance apparatus, that generates a static magnetic field by a high-temperature superconductor 20, located inside a vacuum thermal insulating vessel 22. The method comprises a magnetizing step (A) of cooling down the high-temperature superconductor 20 to a magnetizing low temperature, sufficiently lower than its superconduction transition temperature and magnetizing the high- temperature supercodncutor 20, a magnetic flux setting step (B) of warming up the high- temperature superconductor 20 to a magnetic flux setting temperature which is lower than the superconductivity transition temperature and setting the high-temperature superconductor 20 at a prescribed magnetic flux density, and an operation control step (C) of setting the high-temperature superconductor 20 at a operating temperatures, lower then the magnetic flux setting temperature. |
