Application Of Avalanche Photodiodes Research Articles

Analysis of timing performance for an APD-LSO scintillation detector

The timing performance of a detector designed for application in positron emission tomography (PET) directly effects image noise in the form of random events. The application of avalanche photodiodes in a PET scintillation detector requires careful analysis and design to achieve timing performance comparable to photomultiplier based systems. In this paper, we present a robust technique that allows the analysis of the timing system including the constant fraction discriminator. We compare the analysis to experimental results to prove validity. Finally, we analyze the performance of several CFD topologies capable of being realized in a CMOS ASIC.

Application of avalanche photodiodes as a readout for scintillator tile–fiber systems

The application of reach-through avalanche photodiodes (R'APD) as a photodetector for scintillator tiles has been investigated. The light collected by WLS fibers (0.84 and 1 mm diameter) embedded in the scintillator has been transmitted to the 0.5 mm 2 active surface of APD by clear optical fibers and optical connectors. A low noise charge sensitive preamplifier (≈400e − equivalent noise charge) has been used to amplify the photodiode signal. Various configurations of tile–fiber systems, suitable for CMS and LHCb experiments at LHC have been studied using cosmic muons and muon beam at SPS at CERN. In order to optimize the performance of APD, measurements in the temperature range from −10°C to +25°C have been made. The MIP detection efficiency and e −/MIP separation have been estimated in order to determine applicability of the readout for LHCb preshower.

Application of avalanche photodiodes as a readout for scintillator tile-fiber systems

The application of reach-through avalanche photodiodes (R'APD) as a photodetector for scintillator tiles has been investigated. The light collected by WLS fibers (0.84mm and 1mm diameter) embedded in the scintillator has been transmited to the 0 .5mm2 active surface of APD by clear optical fibers and optical connectors. A low noise charge sensitive preamplifier (approximately 400 electrons equivalent noise charge) has been used to gain the photodiode signal. Various configurations of tile-fibre s ystems, suitable for CMS and LHCb experiments at LHC have been studied using cosmic muons and muon beam at SPS at CERN. In order to optimize the performance of APD, measurments in the temperature range from -10°C to +25°C have been done. The MIP detection efficiency and electron/MIP separation have been estimated in order to determine applicability of the readout for LHCb preshower.