[Triumf-seminars] TRIUMF Technical Seminar today at 16:00
TRIUMF Seminars
triumf-seminars at lists.triumf.ca
Mon Jun 10 05:00:05 PDT 2013
Date/Time: Mon 2013-06-10 at 16:00
Location: Auditorium
Speaker: Fabrice Retiere (TRIUMF)
Title: Silicon Photo-multipliers for high speed, low light intensity photo detection
Abstract: Silicon photo-multipliers (SiPMs) are rapidly replacing vacuum tube photo-multipliers for the detection of scintillating photons produced by ionizing radiation (charged particles, or gamma rays), which are used in niche applications such as Positron Emission Tomography scanners in medical imaging or sub-atomic physics research experiments. SiPMs are designed for the detection of 1 to several thousand photons with high efficiency and at high speed.The SiPM peak photo-detection efficiency is about 35% at 420nm dropping down to 10% at 800nm. SiPMs achieve a single photon timing resolution of 100ps or better thanks to their large gain (106) and fast rise time (0.5-2 ns). High gain is obtained by operating several hundred diodes above breakdown voltage in a pixelized pattern with individual passive quenching circuits. Each photon fully discharges one diode which subsequently recharge in about 40 ns. We will present a detailed characterization of SiPMs in general including a description of their main drawbacks namely high dark noise rate and high rate of correlated discharges. We will also discuss applications for ionizing radiation detection and beyond.
Stimulants available 15 minutes before the talk.
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