| 摘要 |
PURPOSE:To reduce heater power kept at the switch-off state by a method wherein the winding part wound with a superconductive gate wire and a heater wire that heats the gate wire and a coolant path that cools this winding part by thermal conduction are provided to a superconductive switch. CONSTITUTION:In switching ON, a valve 14 is opend and the conduction of a heater 22 is stopped. This enables the winding part 23 to be cooled by thermal conduction with liquid helium passing through the coolant path 13; accordingly, the superconductive gate wire 21 comes into a state of superconduction. In switching OFF, the valve 24 is closed and the heater 22 is conducted. This enables the winding part 23 to be heated by the heater 22; accordingly, the superconductive gate wire 21 comes into a state of normal conduction. Here, when the valve 14 is closed, the coolant path 13 becomes filled with helium gas, and the winding part 23 gets the temperature readily increased by the heater 22. Thereby, switching off is enabled with a small heater power. |
