| 摘要 |
PROBLEM TO BE SOLVED: To enable a voltage applied to a superconducting coil 1 and a current lead to be surely controlled so as to be below a specified withstand voltage. SOLUTION: Emergency demagnetization protective resistors 8a are each connected in parallel between the terminals of each superconducting coil 1 located on the right or left side of a power supply 10, and a series circuit which is composed of a circuit protective resistor 8p whose parallel combined resistance with the emergency demagnetization protective resistor 8a becomes below a reference value and a circuit protective discharge tube 9p that starts to discharge at a reference set voltage, is connected in parallel with the emergency demagnetization protective resistors 8a, by which a voltage higher than the controllable reference value can be prevented from occurring even when a high voltage occurs in an abnormal state. By this setup, a voltage applied to a superconducting coil 1 and a current lead as the component apparatuses of a superconducting magnet unit 6 can be surely controlled so as to be below a specified withstand voltage, so that a withstand voltage design can be carried out, and tolerance for uncertain factors can be dispensed with.
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