Radiation Campaign of HPK Prototype LGAD sensors for the High-Granularity Timing Detector (HGTD)

Abstract

We report on the results of a radiation campaign with neutrons and protons of Low Gain Avalanche Detectors (LGAD) produced by Hamamatsu (HPK) as prototypes for the High-Granularity Timing Detector (HGTD) in ATLAS. Sensors with an active thickness of 50~$\hat{I}¼$m were irradiated in steps of roughly 2$\times$ up to a fluence of $3\times 10^{15}{\mathrm{n}}_{\mathrm{eq}}\mathrm{c}{\mathrm{m}}^{-2}$. As a function of the fluence, the collected charge and time resolution of the irradiated sensors will be reported for operation at $-30^{\circ }$.