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Volume 6 Issue 4
Dec.  2022
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Abstract
References

Reconstruction of Cherenkov image by multiple telescopes of LHAASO-WFCTA

  • 1. Key Laboratory of Particle Astrophyics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China;

  • 2. University of Chinese Academy of Sciences, Beijing, 100049, China;

  • 3. TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China;

  • 4. Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, 2, Dublin, Ireland;

  • 5. Max-Planck-Institut for Nuclear Physics, P.O. Box 103980, 69029, Heidelberg, Germany;

  • 6. State Key Laboratory of Particle Detection and Electronics, Beijing, China;

  • 7. University of Science and Technology of China, Hefei, 230026, Anhui, China;

  • 8. School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China;

  • 9. College of Physics, Sichuan University, Chengdu, 610065, Sichuan, China;

  • 10. School of Astronomy and Space Science, Nanjing University, Nanjing, 210023, Jiangsu, China;

  • 11. Center for Astrophysics, Guangzhou University, Guangzhou, 510006, Guangdong, China;

  • 12. Key Laboratory of Dark Matter and Space Astronomy & Key Laboratory of Radio Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210023, Jiangsu, China;

  • 13. Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China;

  • 14. Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa, 850000, Tibet, China;

  • 15. National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, China;

  • 16. Hebei Normal University, Shijiazhuang, 050024, Hebei, China;

  • 17. School of Physics and Astronomy (Zhuhai) & Sino-French Institute of Nuclear Engineering and Technology (Zhuhai), Sun Yat-sen University, Zhuhai, 519000, China;

  • 18. School of Physics (Guangzhou), Sun Yat-sen University, Guangzhou, 510275, Guangdong, China;

  • 19. Dipartimento di Fisica dell'Università di Napoli "Federico II", Complesso Universitario di Monte Sant'Angelo, via Cinthia, 80126, Napoli, Italy;

  • 20. School of Physics and Astronomy, Yunnan University, Kunming, 650091, Yunnan, China;

  • 21. Département de Physique Nucléaire et Corpusculaire, Faculté de Sciences, Université de Genève, 24 Quai Ernest Ansermet, 1211, Geneva, Switzerland;

  • 22. Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237, Shandong, China;

  • 23. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China;

  • 24. School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450001, Henan, China;

  • 25. Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, Yunnan, China;

  • 26. Institute for Nuclear Research of Russian Academy of Sciences, Moscow, 117312, Russia;

  • 27. School of Physics, Peking University, Beijing, 100871, China;

  • 28. School of Physical Science and Technology, Guangxi University, Nanning, 530004, Guangxi, China;

  • 29. Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China;

  • 30. Department of Physics, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand;

  • 31. Moscow Institute of Physics and Technology, Moscow, 141700, Russia;

  • 32. National Space Science Center, Chinese Academy of Sciences, Beijing, 100190, China

Funds: 

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.

More Information
  • Received Date: April 17, 2022
  • Revised Date: June 13, 2022
  • Accepted Date: July 04, 2022
  • Available Online: November 08, 2023
  • Published Date: September 04, 2022
    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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