Speaker
Description
The Circular Electron Positron Collider Technical Design Report (TDR), as a Higgs and high luminosity Z factory, has been released 2025 at Institute of High Energy Physics, CAS in China. The baseline design of a detector concept consists of a large 3D tracking system, which is a high precision (about 100μm) spatial resolution Time Projection Chamber (TPC) detector as the main track embedded in a 3.0T solenoid field, especially for the accelerator operating at High luminosity Tera-Z. TPC requires the longitudinal time resolution <100ns) and the physics goals require PID resolution (<3%).
In this talk, we will present the feasibility and progress of the high-precision TPC technology for the Circular Electron Positron Collider (CEPC), even at low-luminosity Tera-Z operation. The fundamental parameters such as spatial resolution, PID with good separation power using cluster counting, and drift velocity were studied through simulation and measurement using a TPC prototype with 500 mm drift length. Compared with pad readout in simulation, the high-granularity readout TPC option (hundred-micrometer level) achieves
better spatial resolution for single electrons, balanced against power consumption, with very high detection efficiency, excellent tracking, and good PID performance (less than 3σ). In addition, we will report on the ongoing R&D of TPC readout modules based on the TEPIX chip, which represents a key step towards integrated, low power front end electronics for future TPC systems. We will review these results and summarize the next steps towards TPC R&D for tracker detectors in future e+e- colliders.