Abstract
Introduction
One of main scientific goals of the Large High Altitude Air Shower Observatory (LHAASO) is to accurately measure the energy spectra of different cosmic ray compositions around the ‘knee’ region. The Wide Field-of-View (FoV) Cherenkov Telescope Array (WFCTA), which is one of the main detectors of LHAASO and has 18 telescopes, is built to achieve this goal. Multiple telescopes are put together and point to connected directions for a larger FoV.
Method
Telescopes are deployed spatially as close as possible, but due to their own size, the distance between two adjacent telescopes is about 10 m. Therefore, the Cherenkov lateral distribution and the parallax between the two telescopes should be considered in the event building process for images crossing over the boundaries of FoVs of the telescopes. An event building method for Cherenkov images measured by multiple telescopes of WFCTA is developed. The performance of the shower measurements using the combined images is evaluated by comparing with showers that are fully contained by a virtual telescope in simulation.
Results and conclusion
It is proved that the developed event building process can help to increase the FoV of WFCTA by 30% while maintaining the same reconstruction quality, compared to the separate telescope reconstruction method.
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Acknowledgements
This work is supported by the National Key R &D program of China under grants 2018YFA0404201. This research work is also supported by the National Natural Science Foundation of China, with NSFC Grants No. 11635011, No. 11761141001, No. 11905240, No. 12105293, No.12105294, No. U2031103, No. U1831208, No. 11503021, No. 11205126, No.11947404, and No. 11675187, by IHEP innovation project No. E25451U2, by the Science and Technology Department of Sichuan Province 2021YFSY0031, by the Xiejialin Foundation of IHEP No. E2546IU2, by RTA6280002 from Thailand Science Research and Innovation in Thailand. The authors would like to thank all staff members who work at the LHAASO site all year around to maintain the system running efficiently, even in the demanding conditions at a mean altitude of 4400 meters above sea level. We are grateful to Chengdu Management Committee of Tianfu New Area for the constant financial support of research with LHAASO data.
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Aharonian, F., An, Q., Axikegu et al. Reconstruction of Cherenkov image by multiple telescopes of LHAASO-WFCTA. Radiat Detect Technol Methods 6, 544–557 (2022). https://doi.org/10.1007/s41605-022-00342-4
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DOI: https://doi.org/10.1007/s41605-022-00342-4