Abstract-In previous papers a new method to characterize HTS pellets has been presented This method is based on the measurement of their complete penetration magnetic flux density BP. It allows determining the critical current density JC and the nvalue of the classical power law model. In this paper, a method of determination of BP of a unique HTS pellet from the measurements of the magnetic field at its top-center surface is presented. This is a simpler and cheaper method than previous methods. It uses analytical calculation based on Biot and Savard law and numerical calculation based on power law. The maximum magnetic flux density produced by the SC pellet BZSCM is deduced from the measurement. BP is deduced from BZSCM multiplying it by a coefficient analytically calculated. The influence of JC(B) on this method is presented and analyzed. Index Terms-Superconductors, magnetic field diffusion, critical current density.
The development of bulk magnets based on REBCO type superconductors that can generate up to 17 T requires the implementation of a magnetization system, sometimes pulsed. Therefore, at least one coil around the High Temperature Superconducting (HTS) bulk is required. In this paper, we suggest an analytical approach in order to assess the magnetic vector potential and to compute the inductance of a coil having a rectangular crosssection and concentric with a magnetic circuit including an air-gap. On a proposed geometry, analytical results are compared with those obtained by using Finite Element Analysis (FEA). The gained analytical expressions give accurate results with an error less than 1% on the inductance value of the coil. The induced current density and trapped magnetic field in a HTS bulk during a Pulsed Field Magnetization (PFM) are also calculated using the proposed analytical expressions of the magnetic vector potential combined with an integral method. The achieved results show a remarkable match with those obtained with COMSOL.
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