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Description
The Circular Electron–Positron Collider (CEPC) is designed to reach a center-of-mass energy of up to 360 GeV for electron–positron collisions, with the primary goals of precision studies of the Higgs boson and searches for physics beyond the Standard Model. The CEPC outer silicon tracker will cover a total active area of ~85 m² and employ advanced long microstrip AC-Coupled Low-Gain Avalanche Diode (AC-LGAD) sensors to provide a spatial resolution of about 10 μm and a timing resolution of about 50 ps. For implementation over such a large detector area, centimeter-scale strips are essential for reducing the number of readout channels, power consumption, and overall system complexity.
This work presents the development and performance characterization of centimeter-scale strip AC-LGAD sensors at the Institute of High Energy Physics (IHEP). Sensors with strip lengths ranging from 1 to 4 cm have been designed, fabricated, and systematically characterized. Their electrical characteristics, including current–voltage and capacitance–voltage measurements, as well as their timing and spatial performance, are studied. In addition, the timing performance of the sensors coupled to a dedicated readout ASIC (LATRIC) is presented. These results demonstrate the potential of centimeter-scale AC-LGAD sensors for the CEPC outer silicon tracker and provide important input for the design and optimization of future large-area precision timing trackers.
