The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/12891 https://doi.org/10.1109/tns.2008.922219 |
Resumo: | The operation of the recently introduced photon assisted cascaded electron multiplier (PACEM) in CF4 is investigated. The PACEM uses the VUV scintillation produced in the electron avalanches of the first multiplier of the cascade to transfer the signal to the subsequent ones. The VUV scintillation induces the emission of a large number of photoelectrons from a Csl photocathode placed on the top-surface of the second multiplier. The photoelectrons are further multiplied in the subsequent stages of the cascade, resulting in efficient signal amplification. A mesh, set at a fixed voltage, is placed between the first and the second multipliers to block the charge transfer between them, thus suppressing all the ion backflow (IBF) heading to the first cascade element. The PACEM electrically isolates the first multiplier of the cascade and only the ions produced in the electron avalanches of the first element may flow back into the drift region. Operating in CF4, absolute IBFs as low as ~1 ion per primary electron are achieved for drift fields of 0.1 kV/cm, while for fields of 0.5 kV/cm the absolute IBF is ~10 ions/primary electron. This corresponds to an IBF of 10-4 at gains of 104, for time projection chambers (TPC) operating conditions, and IBFs of ~10-5 at gains of 106 for gaseous photomultipliers (GPM) operating conditions |
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The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow SuppressionThe operation of the recently introduced photon assisted cascaded electron multiplier (PACEM) in CF4 is investigated. The PACEM uses the VUV scintillation produced in the electron avalanches of the first multiplier of the cascade to transfer the signal to the subsequent ones. The VUV scintillation induces the emission of a large number of photoelectrons from a Csl photocathode placed on the top-surface of the second multiplier. The photoelectrons are further multiplied in the subsequent stages of the cascade, resulting in efficient signal amplification. A mesh, set at a fixed voltage, is placed between the first and the second multipliers to block the charge transfer between them, thus suppressing all the ion backflow (IBF) heading to the first cascade element. The PACEM electrically isolates the first multiplier of the cascade and only the ions produced in the electron avalanches of the first element may flow back into the drift region. Operating in CF4, absolute IBFs as low as ~1 ion per primary electron are achieved for drift fields of 0.1 kV/cm, while for fields of 0.5 kV/cm the absolute IBF is ~10 ions/primary electron. This corresponds to an IBF of 10-4 at gains of 104, for time projection chambers (TPC) operating conditions, and IBFs of ~10-5 at gains of 106 for gaseous photomultipliers (GPM) operating conditionsIEEE2008-06info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/12891http://hdl.handle.net/10316/12891https://doi.org/10.1109/tns.2008.922219engIEEE Transactions on Nuclear Science 55:3 (2008) 1652-16560018-9499Amaro, F. D.Veloso, J. F. C. A.Santos, J. M. F. dosBreskin, A.Chechik, R.Lyashenko, A.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-10-22T09:44:30Zoai:estudogeral.uc.pt:10316/12891Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:53.796195Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression |
title |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression |
spellingShingle |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression Amaro, F. D. |
title_short |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression |
title_full |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression |
title_fullStr |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression |
title_full_unstemmed |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression |
title_sort |
The Photon-Assisted Cascaded Electron Multiplier Operation in CF _{4} for Ion Backflow Suppression |
author |
Amaro, F. D. |
author_facet |
Amaro, F. D. Veloso, J. F. C. A. Santos, J. M. F. dos Breskin, A. Chechik, R. Lyashenko, A. |
author_role |
author |
author2 |
Veloso, J. F. C. A. Santos, J. M. F. dos Breskin, A. Chechik, R. Lyashenko, A. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Amaro, F. D. Veloso, J. F. C. A. Santos, J. M. F. dos Breskin, A. Chechik, R. Lyashenko, A. |
description |
The operation of the recently introduced photon assisted cascaded electron multiplier (PACEM) in CF4 is investigated. The PACEM uses the VUV scintillation produced in the electron avalanches of the first multiplier of the cascade to transfer the signal to the subsequent ones. The VUV scintillation induces the emission of a large number of photoelectrons from a Csl photocathode placed on the top-surface of the second multiplier. The photoelectrons are further multiplied in the subsequent stages of the cascade, resulting in efficient signal amplification. A mesh, set at a fixed voltage, is placed between the first and the second multipliers to block the charge transfer between them, thus suppressing all the ion backflow (IBF) heading to the first cascade element. The PACEM electrically isolates the first multiplier of the cascade and only the ions produced in the electron avalanches of the first element may flow back into the drift region. Operating in CF4, absolute IBFs as low as ~1 ion per primary electron are achieved for drift fields of 0.1 kV/cm, while for fields of 0.5 kV/cm the absolute IBF is ~10 ions/primary electron. This corresponds to an IBF of 10-4 at gains of 104, for time projection chambers (TPC) operating conditions, and IBFs of ~10-5 at gains of 106 for gaseous photomultipliers (GPM) operating conditions |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-06 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/12891 http://hdl.handle.net/10316/12891 https://doi.org/10.1109/tns.2008.922219 |
url |
http://hdl.handle.net/10316/12891 https://doi.org/10.1109/tns.2008.922219 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
IEEE Transactions on Nuclear Science 55:3 (2008) 1652-1656 0018-9499 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
IEEE |
publisher.none.fl_str_mv |
IEEE |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799133889396998144 |