Noncontact Characterization of In-Plane Distribution of Critical Current Desity in Multifilamentary Coated Conductor

• Published in: IEEE transactions on applied superconductivity Vol. 22; no. 3; p. 9500704
• Main Authors: Higashikawa, K., Shiohara, K., Inoue, M., Kiss, T., Machi, T., Chikumoto, N., Lee, S., Tanabe, K., Izumi, T., Okamoto, H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alternating current; Applied sciences; Conductors; Conductors (devices); Critical current (superconductivity); Critical current density; Critical current distribution; Current density; Current distribution; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Equivalence; Exact sciences and technology; filament width; Magnetic fields; Microscopy; multifilamentary coated conductor; Nonhomogeneous media; Scanning; scanning Hall-probe microscopy; Superconductivity; Various equipment and components; External field; Scanning probe microscopy; Coated material; Critical current distribution; Critical current; multifilamentary coated conductor; scanning Hall-probe microscopy; Electric power; Quality control; Current distribution; Electrical conductor; Measurement method; filament width; AC losses; Magnetic field; Current density; Non contact measurement
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2011.2176711

Using a scanning Hall-probe microscopy, we have developed a noncontact characterization method for multifilamentary coated conductors. In-plane distributions of sheet current density in a multifilamentary coated conductor were visualized at different conditions of external magnetic field. From these results, we could extract local critical current and equivalent width of each filament as a function of longitudinal position. These items will be indispensable for quality control of multifilamentary coated conductors and for the precise estimation of their AC losses. This means that this characterization method will be a key technology for the establishment of multifilamentary coated conductors which promise electric power applications with low AC losses.