| 摘要 |
Disclosed is a method of measuring a critical electric current value of a superconducting wire (1). The method includes the steps of measuring first to mth (where m is an integer number of 2 or more) electric current values (I1, I2,..., Im), and first to mth voltage values (V1, V2,..., Vm) corresponding to the respective ones of the current values, by feeding a current to the wire and varying the value of the current. The first current value and voltage value are measured by retaining the current fed from a constant current source (6) to the wire in a state set to a first set value for a constant time and thereafter measuring the current flowing through the wire and a voltage generated in the wire. The kth (k being an integer 2d"kd"m) current value and the kth voltage value are measure by retaining the current fed from the constant current source to the wire in a state set to a kth set value higher than a (k-1)th set value for the constant time and thereafter measuring the current flowing through the wire and the voltage generated in the wire.
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