Gain reduction mechanism observed in Low Gain Avalanche Diodes

Low Gain Avalanche Diodes (LGADs) is one of the candidate sensing technologies for future 4D-tracking applications and recently have been qualified to be used in the ATLAS and CMS timing detectors for the CERN High Luminosity Large Hadron Collider upgrade. LGADs can achieve an excellent timing perfo...

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Detalles Bibliográficos
Autores: Currás, Esteban, Fernández-García, Marcos, Moll, Michael
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/279948
Acceso en línea:http://hdl.handle.net/10261/279948
Access Level:acceso abierto
Palabra clave:LGAD
Gain
Charge collection
Timing detectors
Jitter
Charge density
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repository_id_str
spelling Gain reduction mechanism observed in Low Gain Avalanche DiodesCurrás, EstebanFernández-García, MarcosMoll, MichaelLGADGainCharge collectionTiming detectorsJitterCharge densityLow Gain Avalanche Diodes (LGADs) is one of the candidate sensing technologies for future 4D-tracking applications and recently have been qualified to be used in the ATLAS and CMS timing detectors for the CERN High Luminosity Large Hadron Collider upgrade. LGADs can achieve an excellent timing performance by the presence of an internal gain that improves the signal-to-noise ratio leading to a better time resolution. These detectors are designed to exhibit a moderate gain with an increase of the reverse bias voltage. The value of the gain strongly depends on the temperature. Thus, these two values must be kept under control in the experiments to maintain the gain within the required values. A reduction in the reverse bias or an increase in the temperature will reduce the gain significantly. In this paper, a mechanism for gain reduction in LGADs is going to be presented. It was observed, that the gain measured in these devices depends on the charge density projected into the gain layer, generated by a laser or a charged particle in their bulk. Measurements performed with different detectors showed that ionizing processes that induce more charge density in the detector bulk lead to a decrease in the detector’s measured gain. Measurements conducted with an IR-laser and a Sr-90 in the lab, modifying the charge density generated in the detector bulk, confirmed this mechanism and will be presented here.This work was performed in the framework of the RD50 Collaboration and the CERN & Programme on Technologies for Future Experiments.Peer reviewedElsevierCentre National de la Recherche Scientifique (France)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/279948reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.nima.2022.166530Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2799482026-05-22T06:33:51Z
dc.title.none.fl_str_mv Gain reduction mechanism observed in Low Gain Avalanche Diodes
title Gain reduction mechanism observed in Low Gain Avalanche Diodes
spellingShingle Gain reduction mechanism observed in Low Gain Avalanche Diodes
Currás, Esteban
LGAD
Gain
Charge collection
Timing detectors
Jitter
Charge density
title_short Gain reduction mechanism observed in Low Gain Avalanche Diodes
title_full Gain reduction mechanism observed in Low Gain Avalanche Diodes
title_fullStr Gain reduction mechanism observed in Low Gain Avalanche Diodes
title_full_unstemmed Gain reduction mechanism observed in Low Gain Avalanche Diodes
title_sort Gain reduction mechanism observed in Low Gain Avalanche Diodes
dc.creator.none.fl_str_mv Currás, Esteban
Fernández-García, Marcos
Moll, Michael
author Currás, Esteban
author_facet Currás, Esteban
Fernández-García, Marcos
Moll, Michael
author_role author
author2 Fernández-García, Marcos
Moll, Michael
author2_role author
author
dc.contributor.none.fl_str_mv Centre National de la Recherche Scientifique (France)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv LGAD
Gain
Charge collection
Timing detectors
Jitter
Charge density
topic LGAD
Gain
Charge collection
Timing detectors
Jitter
Charge density
description Low Gain Avalanche Diodes (LGADs) is one of the candidate sensing technologies for future 4D-tracking applications and recently have been qualified to be used in the ATLAS and CMS timing detectors for the CERN High Luminosity Large Hadron Collider upgrade. LGADs can achieve an excellent timing performance by the presence of an internal gain that improves the signal-to-noise ratio leading to a better time resolution. These detectors are designed to exhibit a moderate gain with an increase of the reverse bias voltage. The value of the gain strongly depends on the temperature. Thus, these two values must be kept under control in the experiments to maintain the gain within the required values. A reduction in the reverse bias or an increase in the temperature will reduce the gain significantly. In this paper, a mechanism for gain reduction in LGADs is going to be presented. It was observed, that the gain measured in these devices depends on the charge density projected into the gain layer, generated by a laser or a charged particle in their bulk. Measurements performed with different detectors showed that ionizing processes that induce more charge density in the detector bulk lead to a decrease in the detector’s measured gain. Measurements conducted with an IR-laser and a Sr-90 in the lab, modifying the charge density generated in the detector bulk, confirmed this mechanism and will be presented here.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/279948
url http://hdl.handle.net/10261/279948
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.nima.2022.166530
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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