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

GAO Bo; CHEN Ming-Jun; GU Min-Hao; HAO Xin-Jun; LI Hui-Cai; WU Han-Rong; YAO Zhi-Guo; YOU Xiao-Hao; ZHOU Bin

doi:10.1088/1674-1137/38/2/026003

Chinese Physics C> 2014, Vol. 38> Issue(2) : 026003 DOI: 10.1088/1674-1137/38/2/026003

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

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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.

References

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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

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Received: 2013-04-02
Revised: 2013-05-22

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2013-04-02
Accepted Date: 2013-05-22
Available Online: 2014-02-05

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.