| 摘要 |
PURPOSE:To make a hollow tube resist quench without enlarging a diameter and a plate thickness thereof by restraining gas pressure inside the hollow tube from rising which is caused by quench caused by an oxide superconductor passing through an inside of the hollow tube of a low temperature side lead of a current lead. CONSTITUTION:A bursting mechanism 7 is provided to a hollow tube of a low temperature side lead 5A. It operates to discharge helium gas 12 inside a hollow tube to the outside when a pressure of the helium gas 12 inside the hollow tube exceeds a specified value, and stops discharge when the pressure is the specified value or less; thereby, the pressure inside the hollow tube can be restrained from rising not to exceed the specified value. Furthermore, when the pressure stops rising, the mechanism returns to a normal state and the operation of a superconducting device can be continued. Since just mechanical strength which is high enough to resist the specified value is required for the hollow tube, it is possible to reduce a diameter and a plate thickness thereof and to reduce the penetration of heat transmitted through a current lead. |
