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Chinese Physics C> 2017, Vol. 41> Issue(2) : 026002 DOI: 10.1088/1674-1137/41/2/026002

A method to monitor and measure the water transparency in LHAASO-WCDA using cosmic muon signals

  • 1.

      Nankai University, Tianjin 300071, China

  • 2.

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

  • The Large High Altitude Air Shower Observatory (LHAASO) is to be built at Daocheng, Sichuan Province, China. As one of the major components of the LHAASO project, a Water Cherenkov Detector Array (WCDA), with an area of 78000 m2, contains 350000 tons of purified water. The water transparency and its stability are critical for successful long-term operation of this project. To gain full knowledge of the water Cherenkov technique and investigate the engineering issues, a 9-cell detector array has been built at the Yangbajing site, Tibet, China. With the help of the distribution of single cosmic muon signals, the monitoring and measurement of water transparency are studied. The results show that a precision of several percent can be obtained for the attenuation length measurement, which satisfies the requirements of the experiment. In the near future, this method could be applied to the LHAASO-WCDA project.
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    [4] Z. G. YAO, H. R. Wu, M. J. Chen et al, Design and Performance of LHAASO-WCDA Experiment, in 32nd ICRC (2011)
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    [10] S. Ostapchenko, Phys. Rev. D, 74(1):014026(2006)
    [11] M. Aguilar, D. Aisa, B. Alpat et al, Phys. Rev. Lett., 114 (17):171103(2015)
    [12] M. Aguilar, D. Aisa, B. Alpat et al, Phys. Rev. Lett., 115 (21):211101(2015)
    [13] H. S. Ahn, P. Allison, M. G. Bagliesi et al, The Astrophysical Journal, 707 (1):593-603(2009)

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Hui-Cai Li, Zhi-Guo Yao, Chun-Xu Yu, Ming-Jun Chen, Han-Rong Wu, Min Zha, Bo Gao, Xiao-Jie Wang, Jin-Yan Liu and Wen-Ying Liao. A method to monitor and measure the water transparency in LHAASO-WCDA using cosmic muon signals[J]. Chinese Physics C, 2017, 41(2): 026002. doi: 10.1088/1674-1137/41/2/026002
Hui-Cai Li, Zhi-Guo Yao, Chun-Xu Yu, Ming-Jun Chen, Han-Rong Wu, Min Zha, Bo Gao, Xiao-Jie Wang, Jin-Yan Liu and Wen-Ying Liao. A method to monitor and measure the water transparency in LHAASO-WCDA using cosmic muon signals[J]. Chinese Physics C, 2017, 41(2): 026002.  doi: 10.1088/1674-1137/41/2/026002 shu
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Received: 2016-07-28
Revised: 2016-10-16
Fund

    Supported by U1332201, U1532258 and NSFC (11375224, 11675187)

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A method to monitor and measure the water transparency in LHAASO-WCDA using cosmic muon signals

    Corresponding author: Hui-Cai Li,
  • 1.  Nankai University, Tianjin 300071, China
  • 2.  Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received Date: 2016-07-28
  • Accepted Date: 2016-10-16
  • Available Online: 2017-02-05
Fund Project:  Supported by U1332201, U1532258 and NSFC (11375224, 11675187)

Abstract: The Large High Altitude Air Shower Observatory (LHAASO) is to be built at Daocheng, Sichuan Province, China. As one of the major components of the LHAASO project, a Water Cherenkov Detector Array (WCDA), with an area of 78000 m2, contains 350000 tons of purified water. The water transparency and its stability are critical for successful long-term operation of this project. To gain full knowledge of the water Cherenkov technique and investigate the engineering issues, a 9-cell detector array has been built at the Yangbajing site, Tibet, China. With the help of the distribution of single cosmic muon signals, the monitoring and measurement of water transparency are studied. The results show that a precision of several percent can be obtained for the attenuation length measurement, which satisfies the requirements of the experiment. In the near future, this method could be applied to the LHAASO-WCDA project.

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