Geometry and optics calibration of WFCTA prototype telescopes using star light

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; ZHOU Bin

doi:10.1088/1674-1137/35/5/015

Chinese Physics C> 2011, Vol. 35> Issue(5) : 478-482 DOI: 10.1088/1674-1137/35/5/015

Geometry and optics calibration of WFCTA prototype telescopes using star light

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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.

References

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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

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Received: 2010-07-27
Revised: 2010-09-28

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Geometry and optics calibration of WFCTA prototype telescopes using star light

Received Date: 2010-07-27

Accepted Date: 2010-09-28

Available Online: 2011-05-05

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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Geometry and optics calibration of WFCTA prototype telescopes using star light

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