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Distributed Strain Measurements for a 5T Split NbTi Superconducting Magnet Based on Rayleigh Scattering Distributed Fiber

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Abstract

A 5T semi-open split superconducting magnet has been recently developed at the Advanced Energy Science and Technology Guangdong Laboratory, China, in pursuit of a versatile high magnetic field test facility for measuring the field-dependent and mechanical behaviors of superconductors. It is a better candidate to generate transverse fields in a larger working region (Ø80 mm × H800 mm) and enables non-contact deformation measurements with digital image correlation (DIC). In our previous work, the simulation of the strain and the magnetic field distribution of the coil and support structure had been reported in detail; and the strain measurements for the key points were also carried out using traditional low-temperature strain gauges. However, the distributed strain of the large-scale superconducting magnet is important for exploring the whole stability. And single-point strain gauges often have difficulty measuring global strains for these complex structures. In addition, for resistance-based strain gauges, obtaining accurate strain is even more challenging due to electromagnetic interference. Therefore, in this paper, using the semi-open magnet structure, the distributed strain measurement method based on the Optical Frequency Domain Reflectometry (OFDR) principle under cryogenic and intense field is mainly validated. The global profile of the magnet system strain was monitored throughout the entire operating process, including cool-down, excitation, and warm-up. The distributed fiber strain measurements agree well with traditional single-point resistance measurements. Interesting insights into the global strain characteristics of semi-open split superconducting structures were obtained, such as the catastrophe data and asymmetrical information. The successful application of distributed fiber strain measurements provides a critical distributed detection method in superconducting magnet technology.

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Funding

This work was supported by the National Natural Science Foundation of China (12172357 and 12102432), the Key Projects of Guangdong Basic and Applied Basic Research Fund (2022B1515120051), the Key Projects of Natural Science Fund of Gansu Province (22JR5RA127), and the Youth Innovation Promotion Association CAS, grant number (2022421). Key Technologies R&D Program of Guangdong Province (2020B1111490003).

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Authors and Affiliations

  1. Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516000, China

    Yongjie Zhang, Canjie Xin & Mingzhi Guan

  2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Qiang Hu, Canjie Xin & Mingzhi Guan

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  1. Yongjie Zhang
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  2. Qiang Hu
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  3. Canjie Xin
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  4. Mingzhi Guan
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Correspondence to Mingzhi Guan.

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Zhang, Y., Hu, Q., Xin, C. et al. Distributed Strain Measurements for a 5T Split NbTi Superconducting Magnet Based on Rayleigh Scattering Distributed Fiber. J Supercond Nov Magn 37, 693–700 (2024). https://doi.org/10.1007/s10948-024-06706-9

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  • DOI: https://doi.org/10.1007/s10948-024-06706-9

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