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Science China Technological Sciences

, Volume 57, Issue 12, pp 2523–2529 | Cite as

Application of an acrylic vessel supported by a stainless-steel truss for the JUNO central detector

  • YuanQing Wang
  • Liang Zong
  • YueKun Heng
  • ZongYi Wang
  • Yan Zhou
  • ShaoJing Hou
  • ZhongHua Qin
  • XiaoYan Ma
Article

Abstract

After the success of the Daya Bay experiment, the Jiangmen Underground Neutrino Observatory (JUNO) was launched to measure neutrino-mass hierarchy and oscillation parameters and to study other neutrino physics. Its central detector is set for antineutrinos from reactors, the Earth, the atmosphere, and the Sun. The main requirements of the central detector are containment of 20 kt of liquid scintillator, as the target mass, and 3% energy resolution. It is about a ball-shape detector of 38.5 m with ∼75% coverage of PMT on its inner surface. The design of such a huge detector is a big challenge because it must meet the requirements for several different types of physics measurement and possess the feasibility and reliability in its structure and engineering, all at reasonable time and cost. One option for the JUNO central detector is a hyper-scale acrylic ball submerged in the water to shield the background. This paper proposes a structural scheme for such an acrylic ball that is supported by a stainless-steel truss, inspired by point-supported glass-curtain walls in civil engineering. The preliminary design of the scheme is completed and verified by finite element (FE) method using ABAQUS. FE analysis shows that the scheme can control the stress level of the acrylic ball within the limit of 5 to 10 MPa, in accordance with the demand of the design objective of the central detector. The scheme is of outstanding global stability and allows various choices on local connections. We prove that the scheme is of good feasibility and should be a reasonable option for the central detector.

Keywords

neutrino central detector acrylic stainless-steel truss point-supported glass-curtain wall 

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References

  1. 1.
    An F P, Bai J Z, Balantekin A B, et al. Observation of electron-anti-neutrino disappearance at Daya Bay. Phys Rev Lett, 2012, 108: 171803CrossRefGoogle Scholar
  2. 2.
    Adrian C. Key neutrino measurement signals China’s rise. Science, 2012, 335: 1287–1288CrossRefGoogle Scholar
  3. 3.
    Reich E S. Neutrino oscillations measured with record precision. Nature News, 2012, doi: 10.1038/nature.2012.10202Google Scholar
  4. 4.
    Hirsch M, Päs H, Porod W. Ghostly beacons of new physics. Sci Amer, 2013, 308: 40–47CrossRefGoogle Scholar
  5. 5.
    Feder T. news notes: Daya Bay experiment revs up. Phys Today, 2011, 64: 30Google Scholar
  6. 6.
    Wang Y F. A neutrino experiment using the Daya Bay reactor (in Chinese). Physics, 2007, 36: 207–214CrossRefGoogle Scholar
  7. 7.
    Chen X H, Luo X L, Heng Y K, et al. Leakage tests of the stainless steel vessels of the antineutrino detectors in the Daya Bay reactor neutrino experiment. Sci China Tech Sci, 2013, 56: 148–151CrossRefGoogle Scholar
  8. 8.
    Collaboration S N O. Electron Energy Spectra, Fluxes, and Day-Night Asymmetries of Solar Neutrinos from the 391-Day Salt Phase SNO Data Set. arXiv preprint nucl-ex/0502021, 2005Google Scholar
  9. 9.
    Eguchi K, Enomoto S, Furuno K, et al. First results from KamLAND: Evidence for reactor antineutrino disappearance. Phys Rev Lett, 2003, 90: 021802CrossRefGoogle Scholar
  10. 10.
    Alimonti G, Arpesella C, Back H, et al. Science and technology of Borexino: A real-time detector for low energy solar neutrino. Astropart Physics, 2002, 16: 205–234CrossRefGoogle Scholar
  11. 11.
    Chen J, Fu M F, Lin Z P. Mechanical and photoplasticity research of polymethyl methacrylate (in Chinese). J Tianjin Univ, 2000, 33: 85–87Google Scholar
  12. 12.
    Wang Y Q, Shi Y J, Wu L L. Research on Application Technology of Point-supporting Glass Building (in Chinese). Beijing: Science Press, 2009. 8Google Scholar
  13. 13.
    Wang Y Q, Wu L L, Shi Y J, et al. FEM analysis and experimental study on monolayer cable net for glass facades: Static performance. Adv Struct Eng, 2007, 10: 371–382CrossRefGoogle Scholar
  14. 14.
    JGJ7-2010. Technical specification for space frame structures. 2010Google Scholar
  15. 15.
    CEN. Eurocode 3: Design of steel structures-Part 1–4: General-Structures in stainless steel. 2003Google Scholar
  16. 16.
    Wang X C. Finite Element Method (in Chinese). Beijing: Tsinghua University Press, 2003Google Scholar
  17. 17.
    Wang Y Q, Yuan H X, Shi Y J, et al. Bearing capacity of non-linear metallic spiders used in point supported glass facades. Int J Steel Struct, 2012, 12: 191–204CrossRefGoogle Scholar
  18. 18.
    Wang Y Q, Yuan H X, Shi Y J, et al. A review of current application and research of stainless steel structure (in Chinese). Steel Structures, 2010, 25: 1–13Google Scholar

Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • YuanQing Wang
    • 1
  • Liang Zong
    • 1
  • YueKun Heng
    • 2
  • ZongYi Wang
    • 3
  • Yan Zhou
    • 4
  • ShaoJing Hou
    • 2
  • ZhongHua Qin
    • 2
  • XiaoYan Ma
    • 2
  1. 1.Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil EngineeringTsinghua UniversityBeijingChina
  2. 2.Central Detector GroupInstitute of High Energy Physics (IHEP)BeijingChina
  3. 3.School of Civil and Architectural EngineeringWuhan UniversityWuhanChina
  4. 4.Key Laboratory of New Technology for Construction of Cities in Mountain Area, Department of Civil EngineeringChongqing UniversityChongqingChina

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