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Strain Measurement Method Based on External Symmetrical Compensation Bridge Composed of Strain Gauges with Four-Wire Configuration for a Large-Scale NbTi Superconducting Dipole Magnet Detector

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Abstract

This study presents a new strain measurement method based on an external symmetrical compensation bridge (ESCB) composed of strain gauges with a four-wire configuration. Unlike the traditional strain measurement methods, this method includes two features: first, utilising the four-wire configuration to eliminate measurement errors that occur due to large space-varying thermal and field imbalances of long signal wires during operation, and second, utilising two independent quarter-active sub-bridges with a four-wire configuration composed of ESCB to eliminate the errors that occur due to the large time-varying cryogenic temperature and magnetic field. This method was validated and used on a large-scale NbTi superconducting dipole magnet detector during the cooling, excitation, and quench tests. The strains measured using the ESCB were also compared with those measured using a traditional half-active compensation bridge. The observations showed that the ESCB method can overcome the interference of the temperature gradient and electromagnetic field of long wires during both cooling and electromagnetic excitation processes. In addition to the abrupt strain signal appearing when a quench occurred, high amplitudes occurring at high frequencies were observed at the onset of a quench based on the strain spectra analysis. Thus, the strain spectra are expected to provide a novel means for early quench warning.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (12172357 and 11902129), Key Projects of Natural Science Fund of Gansu Province(22JR5RA127), Guangdong Basic and Applied Basic Research Fund (2022B1515120051), and Youth Innovation Promotion Association CAS (2019404). The authors would like to thank superconducting magnet technology group at IMP for their helpful guidance and suggestions.

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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

    Canjie Xin & Mingzhi Guan

  3. School of Science, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China

    Yongjie Zhang & Tianhu He

  4. Key Laboratory of Mechanics on Western Disaster and Environment, Ministry of Education, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000, China

    Peifeng Gao & Mingzhi Guan

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  1. Yongjie Zhang
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Contributions

Yongjie Zhang, Peifeng Gao and Mingzhi Guan wrote the main manuscript text, Yongjie Zhang, Canjie Xin and Mingzhi Guan conducted experiments and analyzed the data, Yongjie Zhang, Peifeng Gao and Mingzhi Guan prepared all the figures. All authors reviewed the manuscript.

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Correspondence to Mingzhi Guan.

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Zhang, Y., Xin, C., Gao, P. et al. Strain Measurement Method Based on External Symmetrical Compensation Bridge Composed of Strain Gauges with Four-Wire Configuration for a Large-Scale NbTi Superconducting Dipole Magnet Detector. J Low Temp Phys 213, 121–137 (2023). https://doi.org/10.1007/s10909-023-02989-9

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