The Circular Electron Positron Collider (CEPC) project was
proposed to measure precisely the properties of the Higgs bosons. A
superb Hadronic Calorimetry (HCAL) will be a crucial component of
the CEPC. Among many choices, an analog read-out HCAL is under
development, which consists of stainless steel as absorber and
scintillator as active medium. A detector cell consists of a
scintillator tile and Silicon photomultipliers (SiPMs). A new cavity
shape design for scintillator tiles of 40× 40× 3 mm^3
by injection molding technique is developed. The simulation and
measurements results show the light output uniformity deviation is
within 10% in a tile with the new design. In this paper,
performance of SiPMs from Hamamatsu (13360-1325PE) and Novel Device
Laboratory (NDL 22-1313-15S) are compared for the CEPC-AHCAL
detector cells. From the measurements of MIP response, the average
light output of a detector cell consisting of the injection molding
tiles and the NDL-SiPMs can reach about 40 photoelectrons (p.e.),
which is reasonable, considering that the light yield of a
scintillator will be reduced by about 40% after 10 years running.
The energy resolution of the CEPC-AHCAL prototype will degrade less
than 2% for each tile with a non-uniformity of less than 10%,
which is acceptable. This kind of detector cells could be massively
produced.
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