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Ring Imaging Cerenkov Counter |
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HPDs
Introduction
Large area Hybrid Photo Diodes were developed by DEP (Delf Electronic Products B. V.) in
collaboration with the LHC-b group. A Cerenkov photon converts into an electron at the
photocathode deposited on the inner surface of the quartz window. The electron is
accelerated by 20 kV potential before striking the silicon diode. A specially shaped electric
field focuses the electrons onto the diode. The charge induced in the silicon is detected with
low noise electronics. The diode is divded into small pixels, which are read out individually
to locate the photon.
The first HPDs of that type offered by DEP have 61 pixels in each tube. Together with DEP we
are developing a 163 pixel diode. The readout chip will be attaced on the outside of the tube
and is being developed in collaboration with IDE AS.
Tomasz Skwarnicki
Phone: 315-443-5973
Fax: 315-443-9103
Email: tomasz@physics.syr.edu
This page last updated: Friday, 26-Jul-2002 14:49:00 CDT
