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

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; Wen-Ying Liao

doi:10.1088/1674-1137/41/2/026002

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

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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.
- water Cherenkov ,
- LHAASO-WCDA ,
- cosmic muon ,
- water transparency

References

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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

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Received: 2016-07-28
Revised: 2016-10-16

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

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

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