Distributed dynamic strain measurement based on Rayleigh scattering distributed fiber and embedded strain gauge for a NbTi superconducting dipole magnet

Yongjie Zhang (), Zhengnan Han (), Canjie Xin (), Shijun Zheng (), Yu Liang (), Teng Tan () and Mingzhi Guan ()
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Yongjie Zhang: Chinese Academy of Sciences
Zhengnan Han: Chinese Academy of Sciences
Canjie Xin: Chinese Academy of Sciences
Shijun Zheng: Chinese Academy of Sciences
Yu Liang: Chinese Academy of Sciences
Teng Tan: Chinese Academy of Sciences
Mingzhi Guan: Chinese Academy of Sciences

The European Physical Journal B: Condensed Matter and Complex Systems, 2025, vol. 98, issue 10, 1-9

Abstract: Abstract A NbTi superconducting dipole magnet was recently developed at the Institute of Modern Physics, Chinese Academy of Sciences, as a prototype coil for an advanced high-field facility. To assess its structural stability and performance throughout the whole operation process, both distributed optical fibers and embedded strain gauges were employed to monitor dynamic global strain distribution. The combination of embedded strain gauges and distributed optical fiber sensing technology provides a multi-dimensional, high-precision measurement method for the health detection of superconducting magnets. Both the global and single-point strains of the magnet system were monitored throughout the operating process, including the cooling and excitation phases. This combined approach establishes a layered monitoring pattern including specific point and distributed strain, facilitating a direct assessment of the overall uniformity of the coil structure and essential support for researching the design and electromagnetic characteristics of superconducting magnets. Graphical abstract

Date: 2025
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DOI: 10.1140/epjb/s10051-025-01075-1

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