| 摘要 |
PURPOSE:To prevent a superconductive switch from being broken when a circuit protecting diode has been brought into a condition of high voltage in a superconductive electromagnet consisting of a superconductive coil, the superconductive switch and the circuit protecting diode by a method wherein the diode for protection is provided with a heater, whereon current runs only during a time when the diode is actuated. CONSTITUTION:A circuit protecting diode 4, a superconductive switch 2 and a superconductive coil 3 are connected in parallel with one another and a superconductive electromagnet is constituted by flowing current, which is supplied from a power source 1 for excitation, thereon. In this constitution, a heater 5 is wound around on the diode in series. The diode 4 is warmed by the heater 5 at the same time as when the diode 4 starts the protecting action. If the resistivity and the winding method of the heater 5 are selected at this time, voltage to apply on the switch 2 and the attenuation of current of the coil 3 can be set arbitrarily. As a result, a protection to the switch 2 can be secured. |
