Electronics of the data acquisition system of the DANSS detector based on silicon photomultipliers
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ectronics of the Data Acquisition System of the DANSS Detector Based on Silicon Photomultipliers D. Svirida for the DANSS Collaboration State Research Center Kurchatov Institute, Institute for Theoretical and Experimental Physics, Moscow, 117218 Russia e-mail: [email protected] Abstract⎯The electronics of the data acquisition system based on silicon photomultipliers is briefly described. The elements and modules of the system were designed and constructed at ITEP especially for the DANSS detector. Examples of digitized signals obtained with the presented electronic modules and selected results on processing of the DANSS engineering data-taking run in spring 2016 are given. DOI: 10.1134/S1063779618010367
The DANSS detector is designated for detection of reactor antineutrinos in the inverse β decay reaction, ν + p → e + + n. The installation is situated under the VVER-1000 reactor of the Kalininskaya NPP, 12 meters from the active core center. The sensitive volume of the detector is 1 m3; it is comprised of 2500 plates of scintillation plastic with a size of 1000 × 40 × 10 mm3, stacked in layers with alternating plate direction. Each plate is covered by a light reflecting paint with addition of 156Gd in order to provide high neutron-capture efficiency in inverse β decay. The light from the plate is extracted using three wavelength-shifting fibers placed in longitudinal grooves. Each of 5 plates from 10 layers of a given direction are united into sections. Pairs of side fibers of 50 plates of the section are collected into bundles at the cathodes of 50 PMTs. The central fiber of each plate is read out by an individual SiPM silicon photomultiplier. Thus, it is possible to record two event coordinates with good spatial resolution. The sensitive volume of the detector is surrounded by a multilayer passive shielding including layers of copper, borated polyethylene, and lead. Scintillation counters of active shielding are installed outside the passive shielding in two layers. More details on the DANSS detector can be found in [1]. The main task of the SiPM data acquisition system is production of the system trigger based on analysis of signals of traditional PMTs and digitization of SiPM channels with hits in a given event. Additional capabilities of the system provide digitization of noise signals from each SiPM using self-triggering of individual channels with digital decimation for calibration measurements in parallel with the physical data acquisition. Signals from each group of 15 SiPMs are collected on carrier boards (CB) located inside the passive protection (Fig. 1). The carrier boards host SiPM signal preamplifiers and the common for the group power supply HVDAC. The HVDAC board provides the following: power supply of preamplifiers and its switch-
ing on/off, control of cathode voltage common for the SiPM group in a range of 10–70 V; control of individual SiPM anode voltage in a range of ±10 V; monitoring of common SiPM current of the group and actual values of set power supply voltage, as well as readout of
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