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

被引：1
|
作者：
Braem, A [1 ]
Chesi, E
Dulinski, W
Filthaut, F
Go, A
Joram, C
Lion, G
Seguinot, J
Weilhammer, P
Wicht, P
Ypsilantis, T
机构：
[1] CERN, CH-1211 Geneva 23, Switzerland
[2] LEPSI, Strasbourg, France
[3] Coll France, F-75231 Paris, France
[4] Ist Nazl Fis Nucl, I-40126 Bologna, Italy
来源：
IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 1999年 / 46卷 / 03期
关键词：
D O I：
10.1109/23.775545
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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 vaccum 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 (K2CsSb) 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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页码：365 / 370
页数：6
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