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Inverse Low Gain Avalanche Detectors (iLGADs) for precise tracking and timing applications

AuthorsCurrás, Esteban CSIC ; Carulla, M.; Centis Vignali, M.; Duarte Campderros, J. CSIC ORCID CVN ; Fernández, M. CSIC ORCID ; Flores, David; García Alonso, A.; Gómez, G. CSIC ORCID ; González, J.; Hidalgo, Salvador ; Jaramillo, R. CSIC ORCID ; Merlos Domingo, Ángel ; Moll, M.; Pellegrini, Giulio; Quirion, David; Vila, Iván CSIC ORCID
Timing detector
Issue Date2020
CitationNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 958: 162545 (2020)
AbstractLow Gain Avalanche Detector (LGAD) is the baseline sensing technology of the recently proposed Minimum Ionizing Particle (MIP) end-cap timing detectors (MTD) at the Atlas and CMS experiments. The current MTD sensor is designed as a multi-pad matrix detector delivering a poor position resolution, due to the relatively large pad area, around 1 mm2; and a good timing resolution, around 20–30 ps. Besides, in his current technological incarnation, the timing resolution of the MTD LGAD sensors is severely degraded once the MIP particle hits the inter-pad region since the signal amplification is missing for this region. This limitation is named as the LGAD fill-factor problem. To overcome the fill factor problem and the poor position resolution of the MTD LGAD sensors, a p-in-p LGAD (iLGAD) was introduced. Contrary to the conventional LGAD, the iLGAD has a non-segmented deep p-well (the multiplication layer). Therefore, iLGADs should ideally present a constant gain value over all the sensitive region of the device without gain drops between the signal collecting electrodes; in other words, iLGADs should have a 100% fill-factor by design. In this paper, tracking and timing performance of the first iLGAD prototypes is presented.
Publisher version (URL)https://doi.org/10.1016/j.nima.2019.162545
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