| 摘要 |
PURPOSE:To decrease penetration heat and to reduce consumption amount of a coolant by a method wherein, after an electric current has been supplied, this lead can be pulled out from a cooling container. CONSTITUTION:Electrode parts 11, 13 are installed at the inside and the outside of a cooling container 1 such as a cryostat or the like; a guide tube 14 which is detachable in a sealed state is attached and detached between the electrode parts; a lead 15 is attached inside the guide tube; a conductive metal O-ring 16 at the lower part is clamped by using a clamping rod 17 which is inserted from the upper part of the guide tube. Thereby, the rod is pushed to the lower- part electrode part 11 and is brought into contact with it so that an electric current can be supplied. Consequently, the lead 15 can be pulled out to the outside of the cooling container 1 together with the guide tube 14 after the electric current has been supplied. Thereby, the electrode lead 15 is not situated inside the cooling container 1 during an operation in a persistent-current mode, a penetration heat is decreased and a consumption amount of a coolant is also reduced. |
