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Research on the measurement of connecting bars’ axial force of JUNO central detector

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Abstract

Background

The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy and precisely measure oscillation parameters and study the solar neutrino, supernova neutrino, geo-neutrino, etc. JUNO’s central detector (CD) has 20 kilo-ton liquid scintillator as target mass, which is contained by a huge acrylic sphere with the inner diameter of 35.4 m, and the acrylic sphere is supported by a stainless steel structure through 590 connecting bars.

Motivation

Part of the connecting bars bear pull force and the other bars bear push force. There is a direct relationship between the stress of connecting bars and that of acrylic sphere. For the installation process of the CD, the pretightening force and axial force of the connecting bars should be monitored with accuracy, and for the filling process and running condition, the precise measurement of axial force can indicate the safety of structure of the CD.

Methods

Statistical method was used to evaluate the performance of measurement schemes, and 4-fiber Bragg grating measurement scheme was determined to be the final scheme, which can get the measurement uncertainty better than 0.7 kN. Performance of different measurement schemes are discussed in detail, and some related finite element analysis and evaluation method are also introduced in this paper.

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Acknowledgements

This work is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA100102).

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Authors and Affiliations

  1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Xiaoyu Yang, Wei He, Yatian Pei, Yuekun Heng, Xiaoyan Ma, Kaixi Huang, Xiaohui Qian & Zhi Wu

  2. State Key Laboratory of Particle Detection and Electronics, Beijing, 100049, China

    Xiaoyu Yang, Yuekun Heng & Xiaoyan Ma

  3. University of Chinese Academy of Science, Beijing, 100049, China

    Yuekun Heng

  4. Dongguan University of Technology, Dongguan, 523808, China

    Lei Yang, Caishen Wang & Yi Li

  5. Beijing Institute of Architectural Design, Beijing, 100045, China

    Huafeng Li

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  1. Xiaoyu Yang
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  2. Lei Yang
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  3. Wei He
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Correspondence to Lei Yang.

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Yang, X., Yang, L., He, W. et al. Research on the measurement of connecting bars’ axial force of JUNO central detector. Radiat Detect Technol Methods 4, 362–371 (2020). https://doi.org/10.1007/s41605-020-00192-y

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  • DOI: https://doi.org/10.1007/s41605-020-00192-y

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