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Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors

98-037 We report on the development of large area hybrid photo diodes (HPD) which are one of the proposed photodetectors for the RICH counters of the LHCb experiment. The HPD's consist of a cylindrical vacuum envelope of 127 mm diameter capped with a spherical borosilicate UV-glass entrance win...

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Detalles Bibliográficos
Autores principales: Chesi, Enrico Guido, Filthaut, F, Go, A, Joram, C, Séguinot, Jacques, Ypsilantis, Thomas
Lenguaje:eng
Publicado: 1998
Materias:
Acceso en línea:http://cds.cern.ch/record/684681
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author Chesi, Enrico Guido
Filthaut, F
Go, A
Joram, C
Séguinot, Jacques
Ypsilantis, Thomas
author_facet Chesi, Enrico Guido
Filthaut, F
Go, A
Joram, C
Séguinot, Jacques
Ypsilantis, Thomas
author_sort Chesi, Enrico Guido
collection CERN
description 98-037 We report on the development of large area hybrid photo diodes (HPD) which are one of the proposed photodetectors for the RICH counters of the LHCb experiment. The HPD's consist of a cylindrical vacuum envelope of 127 mm diameter capped with a spherical borosilicate UV-glass entrance window. Focusing electrodes demagnify the image on a silicon detector of 50~mm diameter comprising 2048 pads with a surface of 1~mm$^2$ each. The analogue readout electronics is integrated in the vacuum tube. As an intermediate step a HPD with a UV sensitive CsI photocathode has been produced which allowed to verify the electron optics of the HPD. A large UHV evaporation plant for the production of HPD's with visible light transmittive bialkali photocathodes (K$_2$CsSb) has been built and successfully operated. The evaporation process is optimized for maximum quantum efficiency and life time of the photocathodes. A cold Indium sealing technique developed for a minimum thermal load of the photocathode and the silicon sensor has proven to provide excellent vacuum tightness.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1998
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spelling cern-6846812019-09-30T06:29:59Zhttp://cds.cern.ch/record/684681engChesi, Enrico GuidoFilthaut, FGo, AJoram, CSéguinot, JacquesYpsilantis, ThomasDevelopment of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectorsDetectors and Experimental Techniques98-037 We report on the development of large area hybrid photo diodes (HPD) which are one of the proposed photodetectors for the RICH counters of the LHCb experiment. The HPD's consist of a cylindrical vacuum envelope of 127 mm diameter capped with a spherical borosilicate UV-glass entrance window. Focusing electrodes demagnify the image on a silicon detector of 50~mm diameter comprising 2048 pads with a surface of 1~mm$^2$ each. The analogue readout electronics is integrated in the vacuum tube. As an intermediate step a HPD with a UV sensitive CsI photocathode has been produced which allowed to verify the electron optics of the HPD. A large UHV evaporation plant for the production of HPD's with visible light transmittive bialkali photocathodes (K$_2$CsSb) has been built and successfully operated. The evaporation process is optimized for maximum quantum efficiency and life time of the photocathodes. A cold Indium sealing technique developed for a minimum thermal load of the photocathode and the silicon sensor has proven to provide excellent vacuum tightness.LHCb-98-037oai:cds.cern.ch:6846811998-12-17
spellingShingle Detectors and Experimental Techniques
Chesi, Enrico Guido
Filthaut, F
Go, A
Joram, C
Séguinot, Jacques
Ypsilantis, Thomas
Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
title Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
title_full Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
title_fullStr Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
title_full_unstemmed Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
title_short Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
title_sort development of large area hybrid photodiodes for the lhcb ring imaging cherenkov detectors
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/684681
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