Study of cluster counting method for CEPC drift chamber

Abstract

Flavor physics and jet research at the Circular Electron and Positron Collider (CEPC) impose increasingly stringent requirements on particle identification (PID). As an alternative central tracker for the CEPC reference detector, one of the key optimization objectives of the drift chamber is its PID capability. The dN/dx method offers superior PID performance for the drift chamber by counting primary ionization. A prototype system including a 120-channel drift chamber, high bandwidth readout electronics and DAQ software was developed and tested using cosmic rays. Preliminary results show a high signal-to-noise ratio (SNR) of 108.87 and an average rise time of 2.08 ns, thereby demonstrating the low-noise and high-bandwidth performance of the electronics. Calibration and preliminary reconstruction have been completed, which lay a foundation for subsequent studies on dN/dx resolution.