| 摘要 |
PURPOSE:To obtain a superconductive electromagnet device which has less thermal invasion, a low cost and a small size by providing detachable current leads and current flowing detachable member detaching unit in vacuum out of a helium vessel, and providing a cooler for cooling the portion in the vacuum vessel of the leads. CONSTITUTION:A helium vessel 2 is sealed, a current flowing detachable member 9 is provided in an external vacuum space 4, detachable current leads 8 pass a vacuum vessel 6 through bellows 6a for sealing in vacuum, and detachably arranged to the member 9. A radiation shield 5 and the intermediate part in the vessel of the leads 8 are connected via a flat netlike thermal anchor 5b as a cooler of detachable current leads. The leads 8 are moved downward, a permanent current switch 7 is opened, an external power source 10 is then operated, thereby generating the desired ferromagnetic field. When the switch 7 is closed and a superconductive coil 1 is shortcircuited, the ferromagnetic field is maintained. Thereafter, the leads 8 are moved upward, the connection to the member 9 is removed to an ordinary operating state. |
