Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Performance of new 8-inch photomultiplier tube used for the Tibet
  muon-detector array   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.

1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom