During the high-luminosity phase of the LHC (HL-LHC), planned to start in 2027, theaccelerator is expected to deliver an instantaneous peak luminosity of up to7.5×1034cm−2s−1.A total integrated luminosity of3000or even4000fb−1is foreseen to be delivered to the generalpurpose detectors ATLAS and CMS over a decade, thereby increasing the discovery potential of theLHC experiments significantly. The CMS detector will undergo a major upgrade for the HL-LHC,with entirely new tracking detectors consisting of an Outer Tracker and Inner Tracker. However,the new tracking system will be exposed to a significantly higher radiation than the current tracker,requiring new radiation-hard sensors. CMS initiated an extensive irradiation and measurementcampaign starting in 2009 to systematically compare the properties of different silicon materialsand design choices for the Outer Tracker sensors. Several test structures and sensors were designedand implemented on 18 different combinations of wafer materials, thicknesses, and productiontechnologies. The devices were electrically characterized before and after irradiation with neutrons,and with protons of different energies, with fluences corresponding to those expected at differentradii of the CMS Outer Tracker after3000fb−1. The tests performed include studies withβsources,lasers, and beam scans. This paper compares the performance of different options for the HL-LHCsilicon sensors with a focus on silicon bulk material and thickness.

Experimental study of different silicon sensor options for the upgrade of the CMS Outer Tracker

Storchi, L.;
2020

Abstract

During the high-luminosity phase of the LHC (HL-LHC), planned to start in 2027, theaccelerator is expected to deliver an instantaneous peak luminosity of up to7.5×1034cm−2s−1.A total integrated luminosity of3000or even4000fb−1is foreseen to be delivered to the generalpurpose detectors ATLAS and CMS over a decade, thereby increasing the discovery potential of theLHC experiments significantly. The CMS detector will undergo a major upgrade for the HL-LHC,with entirely new tracking detectors consisting of an Outer Tracker and Inner Tracker. However,the new tracking system will be exposed to a significantly higher radiation than the current tracker,requiring new radiation-hard sensors. CMS initiated an extensive irradiation and measurementcampaign starting in 2009 to systematically compare the properties of different silicon materialsand design choices for the Outer Tracker sensors. Several test structures and sensors were designedand implemented on 18 different combinations of wafer materials, thicknesses, and productiontechnologies. The devices were electrically characterized before and after irradiation with neutrons,and with protons of different energies, with fluences corresponding to those expected at differentradii of the CMS Outer Tracker after3000fb−1. The tests performed include studies withβsources,lasers, and beam scans. This paper compares the performance of different options for the HL-LHCsilicon sensors with a focus on silicon bulk material and thickness.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11564/720312
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