The X-HPD—A modern implementation of a SMART concept
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Date
2008-04-11
Publication Type
Conference Paper
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yes
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Abstract
The concept of hybrid photodetectors which combine a large area photocathode with a crystal scintillator anode in the centre of a hemispherical vacuum tube was demonstrated first with the Philips SMART tubes and, more recently, with the QUASAR tubes of the Lake Baikal experiment. Photoelectrons from the cathode are accelerated by a potential difference of 20–30 kV and deposit their kinetic energy in the scintillator (or Phosphor). The generated scintillation light is detected by a small and low cost photodetector, e.g. a conventional PMT. The X-HPD study is a variation of this concept aiming at improved performance and maximum simplicity. The glass envelope is essentially spherical and a spatial scintillator crystal is mounted in its centre. The spherical symmetry leads to a uniform collection efficiency and very small intrinsic time spread over the full viewing angle of 120° (3
solid angle). We report about test results of a the first X-HPD prototypes of 208 mm diameter with cylindrical and conical LYSO crystal anodes.
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published
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Book title
Volume
602 (1)
Pages / Article No.
193 - 196
Publisher
Elsevier
Event
3rd International Workshop on a Very Large Volume Neutrino Telescope for the Mediterranean Sea
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Subject
Hybrid photodetector; HPD; X-HPD; Scintillation crystal
Organisational unit
03593 - Dissertori, Günther / Dissertori, Günther
03381 - Pauss, Felicitas (emeritus)