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Thermal reliability analysis of the central detector of JUNO

Abstract

Introduction

The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy, precisely measure oscillation parameters and study solar neutrinos, supernova neutrinos and geo-neutrinos, etc. The central detector (CD) of JUNO has 20,000 tons liquid scintillator as target mass, which contains inside a huge acrylic sphere with inner diameter of 35.4 m, supported by a stainless steel structure. The whole structure of CD will be installed inside a cylindrical water pool, and the acrylic sphere will be submerged in the center of water pool. The operating temperature of CD is designed to be 21 °C as long as over 20 years, which is determined by the mechanical requirement of the structure and physics consideration.

Methods

For this operating temperature, a special cooling system will be used to maintain the temperature inside the water pool. The main structure of CD is composed of acrylic and stainless steel, and they have much different thermal expansion coefficients, strengths and life times. Change in temperature may affect the safety of CD. As part of reliability analysis, the effect of cooling system failure on the CD is considered, and finite element method is used in our thermal calculation. In this article, the temperature fields before and after cooling system failure are calculated and analyzed, and the temperatures of different locations of water pool after cooling system failure are compared and discussed in detail.

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References

  1. Y.F. Li, J. Cao, Y.F. Wang, L. Zhan, Unambiguous determination of the neutrino mass hierarchy using reactor neutrinos. Phys. Rev. D 88, 013008 (2013)

    ADS  Article  Google Scholar 

  2. F. An et al., Neutrino physics with JUNO. J. Phys. G 43, 030401 (2016)

    ADS  Article  Google Scholar 

  3. Z.M. Wang, JUNO Central Detector and its prototyping, in XIV International Conference on Topics in Astroparticle and Underground Physics (TAUP 2015). IOP Publishing

  4. F. An et al., Neutrino physics with JUNO. J. Phys. G 36, 030401 (2016)

    Article  Google Scholar 

  5. T. Adam, et al., JUNO Conceptual Design Report. arXiv:1508.07166v2 [physics.ins-det] (2015)

  6. F.J. Luo, Y.K. Heng et al., PMT overshoot study for the JUNO prototype detector. Chin. Phys. C 2016(9), 89–94 (2016)

    Google Scholar 

  7. Y.Q. Wang, L. Zong et al., Application of an acrylic vessel supported by a stainless-steel truss for the JUNO central detector. Sci. China Technol. Sci. 57(12), 2523–2529 (2014)

    Article  Google Scholar 

  8. H.F. Li et al., Research on design of the main stainless steel structure of JUNO Central Detector. Build. Struct. 2018(10), 92–97 (2018)

    Google Scholar 

  9. J.D. Strachiw, Handbook of Acrylic for Submersibles Hyperbaric Chambers and Aquaria (Best Publishing Company, Flagstaff, 2003), pp. 833–856

    Google Scholar 

  10. S.P. Timoshenko, S. Woinowsky-Krieger, Theory of Plates and Shells, 2nd edn. (McGraw-Hill, New York, 1959)

    MATH  Google Scholar 

  11. D.L. Logan, A First Course in the Finite Element Method, 5th edn. (Cengage Learning, Boston, 2012)

    Google Scholar 

  12. S.M. Yang et al., Heat Transfer, 4th edn. (Higher Education Press, Beijing, 2006)

    Google Scholar 

  13. X. Zhou et al., Phys. Scr. 90, 055701 (2015)

    ADS  Article  Google Scholar 

  14. Y.F. Wang, Daya Bay II: a multi-purpose LS-based experiment, in Proceedings of Science (Neutel 2013) 030

  15. J.N. Reddy, An Introduction to the Finite Method (McGraw-Hill, New York, 1993)

    Google Scholar 

  16. L.J. Segerlind, Applied Finite Element Analysis, 2nd edn. (Wiley, New York, 1984)

    MATH  Google Scholar 

  17. Erdogan Madenci, Ibrahim Guven, The Finite Element Method And Application In Engineering Using ANSYS (Springer, New York, 2006)

    Google Scholar 

  18. X.H. Jin, Y.H. Li, Fluid Mechanics (China Electric Power Press, Beijing, 2011)

    Google Scholar 

  19. J.D. Anderson, Computational Fluid Dynamics (China Machine Press, Beijing, 2015)

    Google Scholar 

  20. F.P. Incropera, Fundamentals of Heat and Mass Transfer, 6th edn. (PHI Learning Pvt. Ltd., New Delhi, 2007)

    Google Scholar 

  21. R.K. Shah, D.P. Sekulic, Fundamentals of Heat Exchanger Design (Wiley, Hoboken, 2003), p. 10

    Book  Google Scholar 

Download references

Acknowledgements

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

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Correspondence to Yuekun Heng.

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Yang, X., Heng, Y., Ma, X. et al. Thermal reliability analysis of the central detector of JUNO. Radiat Detect Technol Methods 3, 64 (2019). https://doi.org/10.1007/s41605-019-0142-y

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  • DOI: https://doi.org/10.1007/s41605-019-0142-y

Keywords

  • Thermal analysis
  • Finite element method
  • Central detector
  • JUNO