Operation control method for superconducting coil

摘要

A control method allowing stable operation of a refrigerator conduction cooling type superconducting coil employing an oxide high temperature superconductor is provided. Thermal resistance between a refrigerator and a superconducting coil connected to a cooling stage of the refrigerator is obtained. From the obtained thermal resistance and the rated cooling capacity of the refrigerator, an effective cooling curve representing the relation between the temperature and calorific value is obtained. Operation of the superconducting coil which is energized while being cooled by the refrigerator is controlled such that the calorific value of the superconducting coil at a prescribed temperature does not exceed the effective cooling curve.