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Abstract: Superconducting magnet is capable of generating immensely strong magnetic field due to its large carrying-current capacity and low power loss, making it a promising candidate for transportation systems and power systems, such as EDS train, NMR/MRI and SMES. It is well known that the higher magnetic field can bring above systems better properties. However, the increase in local magnetic flux density or temperature will result in a decline of the critical current or carrying-current capacity of superconducting magnet, which could restrict the application of superconducting magnet. For the purpose of improving the application of superconducting magnet to EDS train, this paper is to design and optimize a REBCO magnet with stepped cross-section shape (MSCSS), which can make the distribution of the magnetic flux density inside the magnet more uniform and therefore increase the critical current of REBCO magnet. In addition, the MSCSS in EDS train is expected to make the wave form of the electromagnetic forces less harmonic because of the stepped cross-section of magnet. In order to estimate the critical current of the MSCSS, both the so-called T-A model and P-model for MSCSS are established, and the developed P-model can be validated by comparing the calculated results of T-A model. Based on the effective P-model, the geometry parameters of MSCSS are optimized to maximize the critical current of MSCSS, and then these optimal values are used to calculate the suspension force and propulsion force of EDS train. The initially obtained results show that the critical current of MSCSS increases remarkably and thereby the electromagnetic forces can get a proportional increase. Meanwhile, the harmonic component of the electromagnetic forces presents a significant decrease, which will contribute to the stability and comfort of EDS train.
Key words: REBCO magnet, EDS train, optimization, critical current, suspension force
