Speaker
Description
AC-LGADs (AC-coupled Low Gain Avalanche Detectors) have emerged as promising candidates for future 4D tracking systems, garnering significant attention from various research institutes. Studies on IHEP’s AC-LGADs, utilizing 50-µm-thick strip sensors, have demonstrated impressive timing resolution of approximately 40 ps and spatial resolution of around 10 µm. However, centimeter-scale strip AC-LGAD sensors face challenges such as charge sharing, increased capacitance, and other factors that can degrade spatial and timing performance while increasing power consumption. Addressing these issues requires optimization of the AC-LGAD fabrication process and structural design.
This work presents detailed simulations of AC-LGAD designs, focusing on key improvements to enhance performance. These include tuning the n+ sheet resistance to optimize charge sharing, modifying the isolation structure to reduce capacitance, and selecting appropriate coupling dielectric materials. Such advancements aim to position AC-LGADs as robust 4D tracking & time-of-flight (TOF) detectors for future collider experiments. The design of IHEP AC-LGAD strip sensors will also be presented. Additionally, the testing results of IHEP AC-LGAD strip sensors will be discussed in detail.
