The Technical Design Report (TDR) for the Circular Electron Positron Collider (CEPC) accelerator, designed as a Higgs and high-luminosity Z factory, was released in 2023. The baseline detector concept includes a large 3D tracking system, featuring a high-precision Time Projection Chamber (TPC) as one of the main tracking detectors, embedded in a 3.0T solenoid field. This design is also...
Future circular electron-positron collider has been proposed as both Higgs factories and high-luminosity Z factories. The conceptual design of the updated detector includes a tracking system, with the Time Projection Chamber (TPC) serving as the primary tracking detector. The TPC offers high spatial resolution (approximately 100 µm over the entire drift length in a 3T magnetic field) in a...
Sub-100nm processes are becoming a critical trend in the development of HV-CMOS pixel detector technology. To evaluate the impact of in-pixel electronics design on HV-CMOS pixel sensor performance at these advanced process nodes, we have designed and submitted a prototype chip named COFFEE2, fabricated using a 55nm HV-CMOS process. This chip features a pixel array of 32 rows by 20 columns,...
Technology Computer-Aided Design (TCAD) simulations were conducted on High Voltage CMOS (HV-CMOS) sensors with varying substrate resistivities. The simulations investigated how changes in substrate resistivity affect leakage current, breakdown voltage, the depletion region, and the distribution of high electric field areas within the sensor. The effects of pixel gap and p-stop on capacitance...
Accurate trajectory measurements and particle identification are crucial for the CEPC's requirements. The CEPC TDR proposes a comprehensive tracking system, including a Vertex Detector, Inner Silicon Tracker, Time Projection Chamber, and Time-of-Flight (ToF) Outer Tracker. This system is designed to deliver superior track position, momentum, and flight time measurements.
The ToF Outer...
The AC-LGAD technology has been selected for use as the Time-of-Flight (ToF) detector and outer tracker for the Circular Electron-Positron Collider (CEPC). This ToF detector is essential for flavor physics at the CEPC, particularly for distinguishing kaons from pions in the low-energy range. The AC-LGAD-based ToF and outer tracker will be positioned between the TPC and ECAL, covering an area...
The Circular Electron-Positron Collider (CEPC) is designed to operate across various center-of-mass energies, offering significant potential in fields where precise Particle Identification (PID) is crucial, such as flavor physics and the study of Higgs boson couplings to light quarks. ToF measurements are essential for PID, particularly in the 1 GeV energy range where the Time Projection...
