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arXiv · 1603.00008

Performance of new 8-inch photomultiplier tube used for the Tibet muon-detector array

Ying Zhang·Jing Huang·Ding Chen·Liu-Ming Zhai·Xu Chen·Xiao-Bin Hu·Yu-Hui Lin·Xue-Yao Zhang·Cun-Feng Feng·Huan-Yu Jia·Xun-Xiu Zhou·Luo-bu Dan-Zen·Tian-Lu Chen·Ci-Ren Laba·Mao-Yuan·Qi Gao·Ci-ren Zha-xi
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Abstract

A new hybrid experiment has been constructed to measure the chemical composition of cosmic rays around the "knee" in the wide energy range by the Tibet AS$\gamma$ collaboration at Tibet, China, since 2014. They consist of a high-energy air-shower-core array (YAC-II), a high-density air-shower array (Tibet-III) and a large underground water-Cherenkov muon-detector array (MD). In order to obtain the primary proton, helium and iron spectra and their "knee" positions in the energy range lower than $10^{16}$ eV, each of PMTs equipped to the MD cell is required to measure the number of photons capable of covering a wide dynamic range of 100 - $10^{6}$ photoelectrons (PEs) according to Monte Carlo simulations. In this paper, we firstly compare the characteristic features between R5912-PMT made by Japan Hamamatsu and CR365-PMT made by Beijing Hamamatsu. This is the first comparison between R5912-PMT and CR365-PMT. If there exists no serious difference, we will then add two 8-inch-in-diameter PMTs to meet our requirements in each MD cell, which are responsible for the range of 100 - 10000 PEs and 2000 - 1000000 PEs, respectively. That is, MD cell is expected to be able to measure the number of muons over 6 orders of magnitude.

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Ying Zhang, Jing Huang, Ding Chen, Liu-Ming Zhai, Xu Chen, Xiao-Bin Hu, Yu-Hui Lin, Xue-Yao Zhang, Cun-Feng Feng, Huan-Yu Jia, Xun-Xiu Zhou, Luo-bu Dan-Zen, Tian-Lu Chen, Ci-Ren Laba, Mao-Yuan, Qi Gao, Ci-ren Zha-xi. 2016-02-29. Performance of new 8-inch photomultiplier tube used for the Tibet muon-detector array. https://doi.org/10.1088/1748-0221%2F11%2F06%2Fp06016

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