A: The Neutrinos Angra (ν-Angra) Experiment aims to construct an antineutrinos detection device capable of monitoring the Angra dos Reis nuclear reactor activity. Nuclear reactors are intense sources of antineutrinos, and the thermal power released in the fission process is directly related to the flow rate of these particles. The antineutrinos energy spectrum also provides valuable information on the nuclear source isotopic composition. The proposed detector will be equipped with photomultipliers tubes (PMT) which will be readout by a custom Amplifier-Shaper-Discriminator circuit designed to condition its output signals to the acquisition modules to be digitized and processed by an FPGA. The readout circuit should be sensitive to single photoelectron signals, process fast signals, with a full-width-half-amplitude of about 5 ns, have a narrow enough output pulse width to detect both particles coming out from the inverse beta decay ( νe + p → n + e + ), and its output amplitude should be linear to the number of photoelectrons generated inside the PMT, used for energy estimation. In this work, some of the main PMT characteristics are measured and a new readout circuit is proposed, described and characterized.
This document presents a performance assessment of digital filters applied to the signal arriving to the acquisition system of the Neutrinos-Angra Detector which is equipped with the PMT model R5912 by Hamamatsu. It is shown that the signalto-noise ratio of the front-end output signal generated by single photoelectrons can be well enhanced, improving the detection efficiency for events of this kind. Some of the proposed filters will be designed to work as estimator of the peak amplitude value of the signal of interest. The considered filters will be described and the achieved results presented.
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