Signal formation and sharing in AC-LGADs using the ALTIROC 0 front-end chip. (1st November 2022)

• Record Type: Journal Article
• Authors: D'Amen, G.; Chen, W.; de la Taille, C.; Giacomini, G.; Marchand, D.; Morenas, M.; Munoz Camacho, C.; Rossi, E.; Seguin-Moreau, N.; Serin, L.; Tricoli, A.; Wang, P.-K.
• Is Part Of: Journal of instrumentation. Volume 17:Number 11(2022)
• Publication Date: 2022-11-01
• Subjects: Solid state detectors -- Front-end electronics for detector readout -- Photon detectors for UV, visible and IR photons (solid-state); Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/17/11/P11028
• Languages: English
• ISSNs: 1748-0221

Abstract

Abstract: The development of detectors that provide high resolution in four dimensions has attracted wide-spread interest in the scientific community for applications in high-energy physics, nuclear physics, medical imaging, mass spectroscopy as well as quantum information. However, finding a technology capable of fulfilling such aspiration proved to be an arduous task. Among other silicon-based candidates, the Low-Gain Avalanche Diode (LGAD) has already shown excellent timing performances but proved to be unsuitable for fine pixelization. Therefore, the AC-coupled LGAD (AC-LGAD) approach was introduced to provide high resolution in both time and space, making it a promising candidate for future 4D detectors. However, appropriate readout electronics must be developed to match the sensor's fast-time and fine-pitch capabilities. This is currently a major technological challenge. In this paper, we test AC-LGAD prototypes read out by the fast-time ASIC ALTIROC 0, originally developed for the readout of DC-coupled LGADs for the ATLAS experiment at the High Luminosity-LHC. Signal generated by either betas from a 90 Sr source or a focused infra-red laser were analyzed. This paper details the first successful readout of an AC-LGAD sensor using a readout chip. This result will pave the way for the design and construction of a new generation of AC-LGAD-based 4D detectors.