| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
The governing equations of the shielding current density in a high-temperature superconducting (HTS) film are formulated for the case where the film contains cracks. In order to assure the uniqueness of the solution of the derived equations, additional boundary conditions are also derived. A numerical method is proposed for solving the initial-boundary-value problem of the equations.
By using the proposed method, the applicability of the scanning permanent-magnet method (SPM) to the crack identification in an HTS film is investigated. To this end, a defect parameter is defined and it is calculated along various scanning lines. The results of computations show that a crack position can be roughly identified by scanning an HTS film in two opposite directions. Hence, the SPM must be combined with the inductive method to develop a fast high-resolution method for identifying a crack.
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