Recent developments in the Silicon Photomultiplier (SiPM) technology allow employing it for the readout of scintillation light in low-energy gamma-ray applications. For example, the RGB-HD technology, recently developed at FBK features a Photo Detection Efficiency close to 50 % with an Excess Noise Factor of 1.25. On the other hand, the ENF depends on the scintillator, which increases the optical crosstalk probability by reflecting back some of the photons emitted by the hot carriers during the avalanches. In addition, both PDE and ENF strongly depend on the cell size, for a given SiPM technology and scintillator configuration. To study these phenomena and to calculate the optimal SiPM cell size for energy resolution we have developed a numerical simulator of the quantity PDE/ENF, which is one of the most important figures of merit of the photodetector in the scintillation light readout. In this work, we will describe the simulator and its results for different SiPM technologies. In addition, we will compare the simulation results to the correlated noise and the energy resolution at 122 keV measured coupling the SiPMs to CsI(Tl) crystals with different sizes and shapes.
Optimal SiPM Cell Size for Energy Measurements with Scintillator-Enhanced Optical Crosstalk
Gola, Alberto Giacomo;Acerbi, Fabio;Ferri, Alessandro;Paternoster, Giovanni;Zorzi, Nicola;Piemonte, Claudio
2014-01-01
Abstract
Recent developments in the Silicon Photomultiplier (SiPM) technology allow employing it for the readout of scintillation light in low-energy gamma-ray applications. For example, the RGB-HD technology, recently developed at FBK features a Photo Detection Efficiency close to 50 % with an Excess Noise Factor of 1.25. On the other hand, the ENF depends on the scintillator, which increases the optical crosstalk probability by reflecting back some of the photons emitted by the hot carriers during the avalanches. In addition, both PDE and ENF strongly depend on the cell size, for a given SiPM technology and scintillator configuration. To study these phenomena and to calculate the optimal SiPM cell size for energy resolution we have developed a numerical simulator of the quantity PDE/ENF, which is one of the most important figures of merit of the photodetector in the scintillation light readout. In this work, we will describe the simulator and its results for different SiPM technologies. In addition, we will compare the simulation results to the correlated noise and the energy resolution at 122 keV measured coupling the SiPMs to CsI(Tl) crystals with different sizes and shapes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
