Optimization of the CEPC-AHCAL scintillator detector cells
L. Li, Qing Shan, Wenzhen Jia, B. Yu, Y. Liu, Yukun Shi, T. Hu, Jiechen Jiang
Abstract
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.