Speaker
Prof.
Valeri Saveliev
(Obninsk State University)
Description
Development of photodetectors for detecting of low intensity photon flux is one of
the critical issues for experimental physics, medical imaging system and many
others. Review of silicon photomultipliers SiPM, novel type of avalanche
photodetector with Geiger mode operation is presented. The structure of
photodetector is based on the matrices of microcells with density of 1500/mm2,
working in Geiger mode with internal gain of amplification 105 – 106 and integrated
quenching mechanism. Photon detection efficiency of order 20-30 % for green
spectrum of light and estimated time resolution is about 30 ps. The structure of
the photodetector gives the possibility of detecting the low flux up to 1500
photoelectrons with proportional responce.
The physics of silicon photomultipliers, recent development and experimental test
with different kind of scintillation materials will be presented.
Novel type of photodetector - Silicon Photomultiplier is compact, robast, not
sensitive to magnetic fields and will find wide application in medical imaging
system especially in Positron Emission Tomography (PET) and combine PET imaging
system.
Author
Prof.
Valeri Saveliev
(Obninsk State University)