PERSISTENT-CURRENT SWITCHING DEVICE FOR REFRIGERATOR COOLED TYPE SUPEROCONDUCTING MAGNET

PROBLEM TO BE SOLVED: To provide an economical persistent-current switching device for refrigerator cooled type superconducting magnet, by a method, wherein the persistent-current mode operation is efficiently realized for simplifying the transfer of the persistent-current switch main body also in less heat intruded state, while decreasing the attenuation factor of the persistent-current. SOLUTION: A persistent-current switching device for refrigerator cooled type superconducting magnet, aimed at the following two points, i.e., the temperature difference between the high-temperature side cooling stage 7A and the low-temperature side cooling stage 7B of a refrigerator, as well as the possibility of creating the conducting or non-conducting state by connecting or disconnecting the persistent-current main body 25 to or from these two stages 7A or 7B, the persistent-current switch main body 25, made of an superconducting and the superconductings, parallel-connecting the persistent- current switch main body 25 to an superconducting coil 4A (of switching current leads 24 high temperature superconducting ceramics) as well as the heat transfer member 26 capable of thermally connecting or disconnecting the switch main body 25 to or from the cooling stages 7A and 7B are provided.