Development of large area hybrid photodiodes for the LHCb ring imaging Cherenkov detectors
- CERN (Switzerland)
- LEPSI, Strasbourg (France); and others
The authors 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 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{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 transmissive bialkali photocathodes (K{sub 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.
- OSTI ID:
- 679585
- Report Number(s):
- CONF-981110-; ISSN 0018-9499; TRN: 99:009517
- Journal Information:
- IEEE Transactions on Nuclear Science, Vol. 46, Issue 3Pt1; Conference: 1998 IEEE nuclear science symposium and medical imaging conference, Toronto (Canada), 10-12 Nov 1998; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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