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Magnetic Signals of High-Temperature Superconductor Bulk During the Levitation Force Measurement Process

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Abstract

In order to study the commonly neglected magnetic field information in the course of levitation force measurement process in a superconducting maglev system, a multipoint magnetic field measurement platform was employed to acquire magnetic signals of a bulk high-\(T_{c}\) superconductor on both the top and the bottom surface. Working conditions including field cooling (FC) and zero field cooling were investigated for these vertical down and up motions above a permanent magnet guideway performed on a HTS maglev measurement system. We have discussed the magnetic flux variation process based on the Bean model. A magnetic hysteresis effect similar to the levitation force hysteresis loop of the bulk superconductor was displayed and analyzed in this paper. What is more valuable, there exists some available magnetic flux on the top surface of the bulk superconductor, and the proportion is as high as 62.42% in the FC condition, which provides an experimental hint to design the superconductor bulk and the applied field for practical use in a more efficient way. In particular, this work reveals real-time magnetic flux variation of the bulk superconductor in the levitation application, which is the other important information in contrast to the macroscopic levitation and guidance force investigations in previous studies, and it enriches the existing research methods. The results are significant for understanding the magnetic characteristic of superconductors, and they can contribute to optimize the present HTS maglev system design.

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Acknowledgements

This work was partially supported by the National Natural Science Foundation of China (51375404 and 51307147), the Sichuan Youth Science and Technology Fund (2016JQ0039), and the State Key Laboratory of Traction Power at Southwest Jiaotong University (2015TPL_Z02 and 2016TPL_T01).

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Authors and Affiliations

  1. Applied Superconductivity Laboratory, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China

    Huan Huang, Jun Zheng, Nan Qian, Tong Che, Botian Zheng, Liwei Jin & Zigang Deng

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  1. Huan Huang
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  2. Jun Zheng
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  3. Nan Qian
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  4. Tong Che
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  5. Botian Zheng
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  6. Liwei Jin
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  7. Zigang Deng
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Correspondence to Jun Zheng or Zigang Deng.

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Huang, H., Zheng, J., Qian, N. et al. Magnetic Signals of High-Temperature Superconductor Bulk During the Levitation Force Measurement Process. J Low Temp Phys 187, 287–297 (2017). https://doi.org/10.1007/s10909-017-1749-3

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  • DOI: https://doi.org/10.1007/s10909-017-1749-3

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