Enhancement of the E(J,B) Power Law Characterization for Superconducting Wires from Electrical Measurements on a Coil

• Published in: IEEE transactions on applied superconductivity Vol. 22; no. 3; p. 6400504
• Main Authors: Leclerc, J., Berger, K., Douine, B., Leveque, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-06-2012; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Characterization; coil; Coiling; Coils; Condensed Matter; Density measurement; Electric power; Electric wire; Electrical engineering. Electrical power engineering; Electrical measurement; Electromagnetism; Electromagnets; Electronics; Engineering Sciences; Exact sciences and technology; Flux; Flux density; magnet; Materials; Mathematical model; Mathematical models; Noise; Physics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Superconducting devices; Superconducting magnets; Superconducting tapes; Superconductivity; superconductors; tape; Various equipment and components; Voltage measurement; wire; coil; superconductors; Magnet; Superconducting wires; Characterization; Electrical measurement; Superconducting materials; wire; Flux density; Algorithm performance; Computer program; tape; Superconducting tapes; Convergence rate; Power law; Comparative study; characterization; magnet
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2011.2179840

We propose an original method for the characterization of superconducting tapes and wires from electrical measurements on a test coil. The principle is to measure the voltage-current characteristic of a coil for several values of the external applied flux density. A computer program then allows finding parameters of a model of the E(J, B) law that best fit the experimental curves. A numerical study on the algorithm convergence and on the accuracy of results was performed. This method has been employed experimentally to characterize a BiSCCO tape. Parameters of three different models have been obtained and compared. This process has several advantages compared to the conventional measurements on short samples: the voltage to noise ratio is higher and the self flux density of the coil is taken into account. Two models that fits well experimental curves were found.