Tracking and timing measurements on irradiated TI-LGADs

A. Gomez-Carrera; L. Diehl; J. Duarte-Campderros; M. Fernandez; V. Gkougkousis; B. Hiti; G. Kramberger; A. Macchiolo; Y. Padniuk; M. Puklavec; C. Torres Muñoz; I. Velkovska; I. Vila

arXiv · 2606.13478

Tracking and timing measurements on irradiated TI-LGADs

A. Gomez-Carrera·L. Diehl·J. Duarte-Campderros·M. Fernandez·V. Gkougkousis·B. Hiti·G. Kramberger·A. Macchiolo·Y. Padniuk·M. Puklavec·C. Torres Muñoz·I. Velkovska·I. Vila

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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.

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A. Gomez-Carrera, L. Diehl, J. Duarte-Campderros, M. Fernandez, V. Gkougkousis, B. Hiti, G. Kramberger, A. Macchiolo, Y. Padniuk, M. Puklavec, C. Torres Muñoz, I. Velkovska, I. Vila. 2026-06-11. Tracking and timing measurements on irradiated TI-LGADs. https://arxiv.org/abs/2606.13478

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