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

We report on the development of large area hybrid photodiodes (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 W-glass entrance window. Focu...

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Main Authors:	Braem, A., Chesi, E., Dulinski, W., Filthaut, F., Go, A., Joram, C., Lion, G., Seguinot, J., Weilhammer, P., Wicht, P., Ypsilantis, T.
Format:	Conference Proceeding
Language:	English
Subjects:	Cathodes Counting circuits Detectors Electrodes Electron optics Electron tubes Focusing Photodetectors Photodiodes Readout electronics
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creator	Braem, A. Chesi, E. Dulinski, W. Filthaut, F. Go, A. Joram, C. Lion, G. Seguinot, J. Weilhammer, P. Wicht, P. Ypsilantis, T.
description	We report on the development of large area hybrid photodiodes (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 W-glass entrance window. Focusing electrodes demagnify the image on a Si detector of 50 mm diameter comprising 2048 pads with a surface of 1 mm/sup 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 transmitting bialkali photocathodes (K/sub 2/CsSb) has been built and successfully operated. The evaporation process is optimized for maximum quantum efficiency and lifetime 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.
doi_str_mv	10.1109/NSSMIC.1998.774819
format	conference_proceeding
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subjects	Cathodes Counting circuits Detectors Electrodes Electron optics Electron tubes Focusing Photodetectors Photodiodes Readout electronics
title	Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
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