Experimental survey of AC-LGAD sensor design parameters towards optimal 4D tracking in collider experiments

Abstract

We present the performance of centimeter-scale AC-LGAD devices including strip sensors with varying pitch (coarse and narrow), and pixel sensors of varying metal electrode size and geometry. Strip sensors with narrow pitch provide good position reconstruction capabilities, however coarser pitch may offer better cost and performance for applications where channel count or electrical power density should be economized. Pixel sensors with a higher metal area fraction and smaller active thickness provide faster signal risetimes, leading to better time resolution capabilities. We studied the impact of various design parameters on the time and spatial resolution of these sensors and identified the guiding principles for designing sensors optimized for future collider experiments, such as the EIC.

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