Study on Readout Electronics of CEPC Scintillator Analog Hadronic Calorimeter Prototype

The circular electron positron collider (CEPC) is proposed to research Higgs, and particle flow algorithm (PFA) is expected to be adopted to obtain high energy resolution. As a PFA calorimeter, CEPC hadronic calorimeter (HCAL) features fine granularity, which necessitates high integration, low noise, and low power consumption in readout electronics. The scintillator-based analog HCAL (AHCAL), one of the PFA HCAL technical approaches, has been studied. In this article, a readout system of the CEPC AHCAL prototype is designed and implemented. The system can not only read the signals of high-density silicon photomultipliers (SiPMs) but also calibrate SiPM gain and monitor temperature. Testing of the electronics demonstrates that the noise and dynamic range performances meet the requirements. Following mess production and prototype integration, cosmic ray tests and beam tests are conducted, with all results verifying the functionality and performance of the readout system.