A study of sensitive elements of CEPC-AHCAL

The Circular Electron Position Collider (CEPC) aims at precision measurements of Higgs, W and Z boson properties. High granularity calorimetry associated with Particle Flow Algorithm (PFA) aims at jet energy resolution around 30%/root E/GeV. One option for the Hadronic Calorimeter (HCAL) is the so-called Analog HCAL (AHCAL) which consists of stainless steel as the absorber and scintillators as the sensitive material. This talk presents the latest progress on the optimisation studies of the HCAL detector cell in terms of light output and uniformity. Simulation studies on the software compensation technique are also presented, which shows around 10% improvement of the energy resolution with hadrons. In addition, we tried out 8 iterations of polystyrene recipe prototyping and scintillator tiles production with the injection moulding technique and achieved scintillator uniformity within the same batch better than 90%. Effective and fast ways of integrating the detector cells are under development such as an automatic wrapping machine and a glue dispenser. Preliminary results have been made for a merged readout scheme, which may provide a feasible method to reduce the number of electronic channels.