Geometry and optics calibration of WFCTA prototype telescopes using star light

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MA Ling-Ling, BAI Yun-Xiang, CAO Zhen, CHEN Ming-Jun, Li-Hong, CHEN Song-Zhan, CHEN Yao, DING Kai-Qi, HE Hui-Hai, LIU Jia, LIU Jia-Li, LI Xiao-Xiao, MA Xin-Hua, SHENG Xiang-Dong, XIAO Gang, ZHA Min, ZHANG Shou-Shan, ZHANG Yong, ZHAO Jing and ZHOU Bin. Geometry and optics calibration of WFCTA prototype telescopes using star light[J]. Chinese Physics C, 2011, 35(5): 478-482. doi: 10.1088/1674-1137/35/5/015
MA Ling-Ling, BAI Yun-Xiang, CAO Zhen, CHEN Ming-Jun, Li-Hong, CHEN Song-Zhan, CHEN Yao, DING Kai-Qi, HE Hui-Hai, LIU Jia, LIU Jia-Li, LI Xiao-Xiao, MA Xin-Hua, SHENG Xiang-Dong, XIAO Gang, ZHA Min, ZHANG Shou-Shan, ZHANG Yong, ZHAO Jing and ZHOU Bin. Geometry and optics calibration of WFCTA prototype telescopes using star light[J]. Chinese Physics C, 2011, 35(5): 478-482.  doi: 10.1088/1674-1137/35/5/015 shu
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Received: 2010-07-27
Revised: 2010-09-28
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Geometry and optics calibration of WFCTA prototype telescopes using star light

Abstract: The Large High Altitude Air Shower Observatory (LHAASO) project is proposed to study high energy gamma ray astronomy (40 GeV--1 PeV) and cosmic ray physics (20 TeV--1 EeV). The wide field of view Cherenkov telescope array, as a component of the LHAASO project, will be used to study the energy spectrum and composition of cosmic rays by measuring the total Cherenkov light generated by air showers and the shower maximum depth. Two prototype telescopes have been in operation since 2008. The pointing accuracy of each telescope is crucial for the direction reconstruction of the primary particles. On the other hand, the primary energy reconstruction relies on the shape of the Cherenkov image on the camera and the unrecorded photons due to the imperfect connections between the photomultiplier tubes. UV bright stars are used as point-like objects to calibrate the pointing and to study the optical properties of the camera, the spot size and the fractions of unrecorded photons in the insensitive areas of the camera.

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