Patent ID: 8923939

Claim:
A superconduction apparatus, comprising: a superconductor; a first vacuum vessel configured to accommodate said superconductor; a cooling unit which comprises a cold head configured to generate a temperature at which said superconductor is set to a superconducting state; a second vacuum vessel configured to accommodate said cooling unit and said cold head; a first cooling conductor connecting said cold head and said superconductor for cooling said superconductor by said cold head through said first cooling conductor, said first cooling conductor extending through a first connection hole which communicates said first vacuum vessel and said second vacuum vessel; a current lead configured to electrically connect said superconductor with an external terminal; a current lead cooling unit configured to cool said current lead; a third vacuum vessel provided to apart from said second vacuum vessel and configured to accommodate said current lead and said current lead cooling unit; a vacuum unit configured to evacuate each of said first vacuum vessel, said second vacuum vessel and said third vacuum vessel individually, and inject a dry gas into each of said first vacuum vessel, said second vacuum vessel and said third vacuum vessel individually; a second cooling conductor connecting said current lead and said superconductor and extending through a second connection hole which communicates said first vacuum vessel and said third vacuum vessel; and a switch provided in said third vacuum vessel to be controllable from outside the apparatus and configured to connect or disconnect said current lead cooling unit to or from the second cooling conductor which further extends through the second connection hole into the third vacuum vessel, wherein the current lead is put to the superconducting state by being cooled by the current lead cooling unit, an electric power is input to and output from the superconductor via the current lead, and the apparatus is configured such that when the switch is turned off, the current lead cooling unit cools the current lead to the superconducting state, and when the switch is turned on, the current lead cooling unit cools also the superconductor.