Speaker
Description
A large and global community of physicists has been dedicated to realizing the Circular Electron Positron Collider (CEPC), which is proposed as a Higgs and Z factory with a high luminosity. In recent years, the baseline detector concept for CEPC has focused on a large volume Time Projection Chamber (TPC) as the main tracking device in the Concept Document Report (CDR). The TPC detector for CEPC requires both high spatial resolution and excellent particle identification (PID) resolution, even operated at the Z pole run. To address the requirements, researchers at the international collaborations such as the Linear Collider Time Projection Chamber (LCTPC) are investigating a TPC utilizing novel pixel readout than the pad readout technology. Compared the traditional pad readout designs (e.g., 1 mm$\times$ 6 mm), the high granularity pixel readout were designed at a sub-millimeter scale. By utilizing the cluster counting, there is potential to achieve enhanced Particle Identification (PID) capabilities. The comprehensive simulation studies are required and ongoing to improve the detector performance, while also optimizing pixel size to address key issues, such as the readout channels and total power consumption at the end-plate of TPC.
In this talk, the simulation software framework for the CEPC pixel readout TPC was firstly introduced using Garfield++ and Geant4. The framework is consisted two parts of the signal digitization and the data reconstruction. The digitization was parameterized the processes such as primary ionization, drift, diffusion, and amplification at the readout. The data reconstruction was included the event finding, track reconstruction, and the detector performance using the cluster counting. The simulation also demonstrates the advantages of cluster counting through the simulation of detection efficiency. The simulation results indicated the optimization of the high granularity readout (from $300\,\mu m$ to $500\,\mu m$). The track performance results and summarize the next steps of the pad/pixelated TPC technology for e+e- collider will presented too.
