Speaker
Description
Low Gain Avalanche Detectors (LGADs) are characterized by a fast rise time (~500ps) and extremely good time resolution (down to 17ps), and the potential for a very high repetition rate with ~1 ns full charge collection. For the application of this technology to near-future experiments such as e+e- Higgs factories (FCC-ee), the ePIC detector at the Electron-Ion Collider, or smaller experiments (e.g., the PIONEER experiment), the intrinsic low granularity of LGADs and the large power consumption of readout chips for precise timing are problematic. AC-coupled LGADs, where the readout metal is AC-coupled through an insulating oxide layer, could solve both issues at the same time thanks to the 100% fill factor and charge-sharing capabilities. Charge sharing between electrodes allows a hit position resolution well below the pitch/sqrt(12) of standard segmented detectors. At the same time, it relaxes the channel density and power consumption requirements of readout chips. Extensive characterization of AC-LGAD devices from the first full size (up to 3x2 cm) production from HPK for ePIC will be shown in this contribution. We will present the results on large AC-LGADs irradiated with 1 MeV reactor neutrons at extreme fluences and protons at moderate fluences.