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Description
Drift chamber is one of the critical candidate technologies for the tracking detector in the Circular Electron Positron Collider (CEPC). In order to satisfy the enhanced particle identification (PID) requirements imposed by flavor physics and jet research at CEPC, the primary ionization counting (dN/dx) method is adopted to optimize the PID performance of drift chamber. Simulation results indicate that the optimized drift chamber based on the dN/dx method achieves K/π separation capability exceeding 3σ for particles with momenta up to 20 GeV/c.
To investigate the dN/dx based PID capability of drift chamber, we have developed a prototype containing 10×12 sensitive cells with a length of 60 cm. The cell size is 1.8×1.8 cm, utilizing 20 μm gold-plated tungsten sense wires and 70 μm aluminum field wires. The wire parameters and cell dimensions maintain complete compatibility with the CEPC drift chamber design parameters. Concurrently, a 1.3 Gsps high-speed readout electronics system with high bandwidth and low noise characteristics has been developed. The initial integrated commissioning of the detector prototype together with the readout electronics and DAQ system has been completed, verifying the electronics performance and proper operation of the test system. Experimental research and performance analysis of the dN/dx method are being conducted using cosmic rays. This work aims to verify the PID capability through dN/dx measurement and provide significant references for optimizing the technical design parameters of the CEPC drift chamber.
