58 research outputs found

    SiPM Gain Stabilization Studies for Adaptive Power Supply

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    We present herein gain stabilization studies of SiPMs using a climate chamber at CERN. We present results for four detectors not tested before, three from Hamamatsu and one from KETEK. Two of the Hamamatsu SiPMs are novel sensors with trenches that reduce cross talk. We use an improved readout system with a digital oscilloscope controlled with a dedicated LabView program. We improved and automized the analysis to deal with large datasets. We have measured the gain-versus-bias-voltage dependence at fixed temperature and gain-versus-temperature dependence at fixed bias voltage to determine the bias voltage dependence on temperature V(T)V(T) for stable gain. We show that the gain remains stable to better than ±0.5%\pm 0.5\% in the 20C30C20^\circ \rm C - 30^\circ C temperature range if the bias voltage is properly adjusted with temperature.Comment: 14 pages, 41 figures, Talk presented at the International Workshop on Future Linear Colliders (LCWS15), Whistler, Canada, 2-6 November 201

    Data Acquisition System for the CALICE AHCAL Calorimeter

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    The data acquisition system (DAQ) for a highly granular analogue hadron calorimeter (AHCAL) for the future International Linear Collider is presented. The developed DAQ chain has several stages of aggregation and scales up to 8 million channels foreseen for the AHCAL detector design. The largest aggregation device, Link Data Aggregator, has 96 HDMI connectors, four Kintex7 FPGAs and a central Zynq System-On-Chip. Architecture and performance results are shown in detail. Experience from DESY testbeams with a small detector prototype consisting of 15 detector layers are shown

    A Scalable Data Acquisition for the CALICE Tile Hadron Calorimeter

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    The data acquisition system (DAQ) for a highly granular analogue hadron calorimeter (AHCAL) for the future International Linear Collider (ILC) will be presented. The developed DAQ chain has several stages of aggregation and scales up to 4 million channels in the main barrel foreseen for the AHCAL design. The front-end electronics will be embedded in the detector layers in between absorber plates without active cooling. The ILC has a specific timing of <1 ms active recording followed by 199 ms of slow readout, which allows the detector to be operated in power-pulsing mode in order to meet the power dissipation budget. This timing is reflected in the architecture of the DAQ from the very front-end ASIC embedded in the detector layers between absorber plates to the largest link aggregation device, the LDA (Link data aggregator), which has 96 HDMI connectors matching the AHCAL steel absorber plate spacing, four Kintex7 FPGAs and a central Zynq SoC (System-On-Chip). The LDA meets the ILC timing and bandwidth, which will be shown. The same DAQ is used also for AHCAL prototype beam tests, which require rather continuous data taking. DAQ architecture, data flow, timing and performance will be presented in detail. The performance has been demonstrated in recent beam tests at CERN at the PS in 2014 and at the SPS in 2015
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