| 摘要 |
<p>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 (I<sub>1</sub>, I<sub>2</sub>,..., I<sub>m</sub>) and first to m-th voltage values (V<sub>1</sub>, V<sub>2</sub>,..., V<sub>m</sub>). The first electric current value I<sub>1</sub> and the first voltage value V<sub>1</sub> 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 I<sub>1a</sub>. A k-th electric current value I<sub>k</sub> and a k-th voltage value V<sub>k</sub>, (where k is an integer number to satisfy 2a??ñka??ñm), 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 I<sub>ka</sub> that is higher than a (k-1)-th setting current. To this end, a precise critical electric current value can be measured.</p> |
