| 摘要 |
PROBLEM TO BE SOLVED: To prevent Joule heat generation in a cooling pipe by a method, wherein parts having a relation in that both the direction of turns of the pipe and the number of turns of the pipe can cancel out an induced current in the pipe exist in the pipe in a pair. SOLUTION: An electromagnet 1 has a structure, wherein a superconducting wire is wound on a bobbin 28 on a cylinder, and at the same time, the outer periphery of the cylinder is covered with a bobbin cover 29. A cooling pipe 16 is brought into contact with this electromagnet 1 in a state such that the pipe 16 is wound on the electromagnet 1 with a winding method that the pipe 16 is began to be wound on the respective flanges of upper and lower flanges 2 and 3 of the bobbin 28 from the side of the inflow side 5 of a refrigerant and is ended to wind on the side of the outflow side 6 of the refrigerant. Here, the numbers of turns of the pipe 16 on the respective flanges of the upper and lower flanges 2 and 3 are made equal and the directions of turns of the pipe 16 are set so as to become opposite to each other. Moreover, the inflow side 5 is spirally wound on the inner peripheral surface of the bobbin 28 and is wound spirally on the outer peripheral surface of the bobbin cover 29, in such a way as to fold back from the inner peripheral surface. |
