| 摘要 |
A method of measuring a critical electric current value of a superconducting wire (1) is provided with steps of measuring first to m-th (where m is an integer number of 2 or more) electric current values (I1, I2,..., Im) and first to m-th voltage values (V1, V2,..., Vm). The first electric current value I1 and the first voltage value V1 are measured by measuring an electric current flowing through a superconducting wire (1) and a voltage generated at the superconducting wire (1) after an electric current is maintained for a predetermined period of time in a state in which the electric current flowing from a constant electric current source (6) through the superconducting wire (1) is set to a first setting value I1a. A k-th electric current value Ik and a k-th voltage value Vk, (where k is an integer number to satisfy 2<=k<=m), are measured by measuring an electric current flowing through the superconducting wire (1) and a voltage generated at the superconducting wire (1) after an electric current is maintained for a predetermined period of time in a state in which the electric current flowing from the constant electric current source through the superconducting wire is set to a k-th setting value Ika that is higher than a (k-1)-th setting current. To this end, a precise critical electric current value can be measured.
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