A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results

The particle flux increase (pile-up) at the HL-LHC with luminosities of L = 7.5 × 1034 cm−2 s−1 will have a significant impact on the reconstruction of the ATLAS detector and on the performance of the trigger. The forward region and the end-cap where the internal tracker has poorer longitudinal trac...

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Autor principal:	Imam H.
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	hl-lhc atlas hgtd lgad si sensors timing detectors Physics QC1-999
Acceso en línea:	https://doaj.org/article/0df2916711684ab39d7422c08be6770f
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spelling	oai:doaj.org-article:0df2916711684ab39d7422c08be6770f2021-12-02T17:12:46ZA High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results2100-014X10.1051/epjconf/202125311012https://doaj.org/article/0df2916711684ab39d7422c08be6770f2021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_11012.pdfhttps://doaj.org/toc/2100-014XThe particle flux increase (pile-up) at the HL-LHC with luminosities of L = 7.5 × 1034 cm−2 s−1 will have a significant impact on the reconstruction of the ATLAS detector and on the performance of the trigger. The forward region and the end-cap where the internal tracker has poorer longitudinal track impact parameter resolution, and where the liquid argon calorimeter has coarser granularity, will be significantly affected. A High Granularity Time Detector (HGTD) is proposed to be installed in front of the LAr end-cap calorimeter for the mitigation of the pileup effect, as well as measurement of luminosity. It will have coverage of 2.4 to 4.0 from the pseudo-rapidity range. Two dual-sided silicon sensor layers will provide accurate timing information for minimum-ionizing particles with a resolution better than 30 ps per track (before irradiation), for assigning each particle to the correct vertex. The readout cells are about 1.3 mm × 1.3 mm in size, which leads to a high granular detector with 3 million channels. The technology of low-gain avalanche detectors (LGAD) with sufficient gain was chosen to achieve the required high signal-to-noise ratio. A dedicated ASIC is under development with some prototypes already submitted and evaluated. The requirements and general specifications of the HGTD will be maintained and discussed. R&D campaigns on the LGAD are carried out to study the sensors, the related ASICs and the radiation hardness. Both laboratory and test beam results will be presented.Imam H.EDP Sciencesarticlehl-lhcatlashgtdlgadsi sensorstiming detectorsPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 11012 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hl-lhc atlas hgtd lgad si sensors timing detectors Physics QC1-999
spellingShingle	hl-lhc atlas hgtd lgad si sensors timing detectors Physics QC1-999 Imam H. A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results
description	The particle flux increase (pile-up) at the HL-LHC with luminosities of L = 7.5 × 1034 cm−2 s−1 will have a significant impact on the reconstruction of the ATLAS detector and on the performance of the trigger. The forward region and the end-cap where the internal tracker has poorer longitudinal track impact parameter resolution, and where the liquid argon calorimeter has coarser granularity, will be significantly affected. A High Granularity Time Detector (HGTD) is proposed to be installed in front of the LAr end-cap calorimeter for the mitigation of the pileup effect, as well as measurement of luminosity. It will have coverage of 2.4 to 4.0 from the pseudo-rapidity range. Two dual-sided silicon sensor layers will provide accurate timing information for minimum-ionizing particles with a resolution better than 30 ps per track (before irradiation), for assigning each particle to the correct vertex. The readout cells are about 1.3 mm × 1.3 mm in size, which leads to a high granular detector with 3 million channels. The technology of low-gain avalanche detectors (LGAD) with sufficient gain was chosen to achieve the required high signal-to-noise ratio. A dedicated ASIC is under development with some prototypes already submitted and evaluated. The requirements and general specifications of the HGTD will be maintained and discussed. R&D campaigns on the LGAD are carried out to study the sensors, the related ASICs and the radiation hardness. Both laboratory and test beam results will be presented.
format	article
author	Imam H.
author_facet	Imam H.
author_sort	Imam H.
title	A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results
title_short	A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results
title_full	A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results
title_fullStr	A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results
title_full_unstemmed	A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results
title_sort	high-granularity timing detector for the phase-ii upgrade of the atlas calorimeter system: detector concept, description and r&d and beam test results
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/0df2916711684ab39d7422c08be6770f
work_keys_str_mv	AT imamh ahighgranularitytimingdetectorforthephaseiiupgradeoftheatlascalorimetersystemdetectorconceptdescriptionandrdandbeamtestresults AT imamh highgranularitytimingdetectorforthephaseiiupgradeoftheatlascalorimetersystemdetectorconceptdescriptionandrdandbeamtestresults
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A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results

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