Tracking and timing measurements on irradiated TI-LGADs

Abstract

Trench-isolated (TI) LGADs, developed at FBK, are pixelated LGAD implementations where pads are separated by physical trenches etched within the silicon substrate and filled with a dielectric material. Developed as a solution to the LGAD fill factor problem, this technology provides a path towards 4D tracking with reduced inefficiencies in the interpad regions. Through a dedicated 120 GeV SPS pion test beam campaign, the time resolution, efficiency, and inter-pad distance of carbon infused irradiated TI-LGADs is presented. Fluences up to 2.5 x $10^{15}$ n${}_{\text{eq}}$ cm${}^{-2}$ are evaluated, for single trench implementations with varied trench width at a temperature of -25 ${}^o$C. The results show an interpad distance degradation with the irradiation of the detector and an optimal time resolution between 35 ps and 45 ps for all studied devices.

11 pages, 11 figures, 21st Trento Workshop proceedings. Accepted for publication in JINST (JINST_065P_0526)