Online charge calibration of LHAASO-WCDA-a study with the engineering array

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GAO Bo, CHEN Ming-Jun, GU Min-Hao, HAO Xin-Jun, LI Hui-Cai, WU Han-Rong, YAO Zhi-Guo, YOU Xiao-Hao and ZHOU Bin. Online charge calibration of LHAASO-WCDA-a study with the engineering array[J]. Chinese Physics C, 2014, 38(2): 026003. doi: 10.1088/1674-1137/38/2/026003
GAO Bo, CHEN Ming-Jun, GU Min-Hao, HAO Xin-Jun, LI Hui-Cai, WU Han-Rong, YAO Zhi-Guo, YOU Xiao-Hao and ZHOU Bin. Online charge calibration of LHAASO-WCDA-a study with the engineering array[J]. Chinese Physics C, 2014, 38(2): 026003.  doi: 10.1088/1674-1137/38/2/026003 shu
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Received: 2013-04-02
Revised: 2013-05-22
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Online charge calibration of LHAASO-WCDA-a study with the engineering array

Abstract: LHAASO-WCDA is a large ground-based water Cherenkov detector array planned to be built at Shangri-La, Yunnan Province, China. As a major component of the LHAASO project, the main purpose of LHAASO-WCDA is to survey the northern sky for very-high-energy (above 100 GeV) gamma ray sources and measure the spectrum. To gain full knowledge of the water Cherenkov technique and to investigate the engineering issues, a 9-cell detector array has been built at the Yang-Ba-Jing site, neighboring the ARGO-YBJ experiment. With the array, charge calibration methods for both low and high ranges of the PMT readout are studied, whose result shows that a precision at several percentages can be reached, which can satisfy the requirement of the detector array. During the long term operation, the charge calibration stability and environmental affection are studied; in this paper, the results are discussed. These calibration methods are proposed to be applied in the future LHAASO-WCDA project.

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