Numerical calculation for determining the E(J, B) characteristic of a superconducting wire from electrical measurements on a coil
Résumé
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 the solenoid for different exterior 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. This method has many advantages compared to the conventional measurements on short samples [1], [2]: voltages are higher therefore easier to measure, the self flux density of the coil is taken into account and, tests are performed under conditions of the subsequent use of the conductor e.g., wire is wound.