12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[CRI241] Test results of new CR365-PMTs for the Tibet muon-detector array

Speakers

  • Ying ZHANG

Primary authors

  • Ying ZHANG (Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences)

Co-authors

  • Yu-Hui LIN (Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences)
  • Jing HUANG (Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences)
  • Ding CHEN (National Astronomical Observatories, Chinese Academy of Sciences)
  • Liu-Ming ZHAI (National Astronomical Observatories, Chinese Academy of Sciences)
  • Xu CHEN (Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences)
  • Xiao-Bin HU (Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences)
  • Hong-Bo JIN (National Astronomical Observatories, Chinese Academy of Sciences)

Description

In order to obtain the primary proton, helium and iron spectra and their ``knee" positions with energy up to 10^16 eV, each of PMTs equipped to the water-Cherenkov muon-detector array (MD) cell of Tibet ASγ experiment is required to measure the number of photons capable of covering a wide dynamic range of 100 – 10^6 PEs according to Monte Carlo simulations. However, the dynamic range of each MD cell is only 5 to 2000 photoelectrons (PEs) which is mainly designed for observation of high-energy celestial gamma rays. Therefore, we have to add two 8-inch-in-diameter PMTs to meet our requirements in each MD cell. We have compared the characteristic features between R5912-PMT made by Japan Hamamatsu and CR365-PMT made by Beijing Hamamatsu and find that CR365-PMT could fulfill our requirements. In this paper, test results of the first batch of 20 CR365-PMTs made by Beijing Hamamatsu for the Tibet muon-detector array is shown.