SUPERCONDUCTING MAGNET DEVICE, CRYOGENIC FREEZING MACHINE, AND COOLING METHOD FOR SUPERCONDUCTING MAGNET DEVICE

摘要

A superconducting magnet device (10) comprises: a superconducting coil (12); a radiation shield (14) which thermally protects the superconducting coil (12); a main cold head (102) which cools the superconducting coil (12); a sub cold head (104) which cools the radiation shield (14); a shared compressor (106) which supplies coolant gas to the main cold head (102) and the sub cold head (104); a first temperature sensor (40) which measures the temperature of the radiation shield (14); a second temperature sensor (42) which measures the temperature of the superconducting coil (12); and a controller (110) which is configured to start up the sub cold head (104) for initial cooling of the superconducting magnet device (10), stop the sub cold head (104) on the basis of output from the first temperature sensor (40) or the second temperature sensor (42), and cause the main cold head (102) to operate in a state where the sub cold head (104) is stopped.