Enhancement of the E(J, B) power law characterization for superconducting wires from electrical measurements on a coil
Abstract
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: 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. This method has been employed experimentally to characterize a BiSCCO tape, manufactured by Trithor GmbH. Permanent magnets have been used to impose the external flux density to the coil. Parameters of three different models have been obtained and compared. Moreover, this process can be used to quantify the degradation of the wire's characteristics, according to the winding process, e.g., the bending radius and the tensile strength.
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