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[en] 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.
[en] In the present study, we developed a position-sensitive NaI(Tl) scintillation detector module for use in the development of a large-area Compton camera. The developed detector module employs a large (i.e., 27 × 27 × 2 cm3) monolithic NaI(Tl) scintillator coupled with a closely packed array of 6 × 6 square PMTs. A multiplexer-based signal processing circuit and a data acquisition system were developed to estimate the interaction position in the scintillator from the signals of the PMTs by using the maximum likelihood position estimation algorithm (MLPE). The performance of the developed detector was evaluated experimentally, showing that the energy and the time resolution of the detector are 7.88% (for 662-keV gamma ray) and 9.6 ns FWHM, respectively, which are comparable to those of a commercial three-inch cylindrical NaI(Tl) scintillation detector. In addition, the spatial resolutions were about 3-to-6-mm FWHM for a wide energy range (59.5 - 1173 keV) and various interaction positions on the detector (from center to edge), which are satisfactory results considering that a 3-mm-diameter collimated gamma-ray beam was used in the experiments.
[en] The Compressed Baryonic Matter experiment (CBM) will be based at the new Facility for Antiproton and Ion Research (FAIR), which will deliver heavy-ion beams up to energies of 14 A GeV. In nucleus-nucleus collisions at these beam energies strongly interacting matter with densities up to 10 times normal nuclear matter is expected to be produced. The key objective of CBM is to investigate the QCD phase diagram in the region of high baryon-densities. CBM is designed to cope with very high interaction rates up to 10 MHz. This will allow to perform high precision measurements of extremely rare probes which have not been accessible by previous nucleus-nucleus experiments in this energy regime. To achieve the high rate capability CBM will be equipped with fast and radiation hard detectors employing free-streaming readout electronics. A prototype high-speed Data Acquisition (DAQ) system was used for some of CBM subsystems in 2016 and 2017, based on a combination of microTCA (uTCA) and PCIe FPGA boards. A full prototype of the DAQ system using in addition the CERN radiation hard ASIC GBTX will be used for the phase 1 of the mCBM rate at SIS18 (''mini-CBM'') setup in 2018. For mCBM phase 2 in 2019, it will be upgraded to a close to final demonstrator system with a single PCIe board replacing the uTCA and PCIe ones. We report on the progress in the preparation of these DAQ setups.
[en] The advent of digitizer based pulse processing and data acquisition (DAQ) systems has ushered an era of improved experimental setups in the domain of nuclear spectroscopy. These facilities are characterized by increased event rates from state-of-the-art large detector arrays used in the contemporary spectroscopic endeavours and the digital hardware used therewith, with its superior throughput, befits the purpose. Such vantage is owing to the development of fast recursive algorithms that are applied on the digitized detector output pulse for extracting the information of interest, therefrom. The acquired data is typically constituted with the energy and the timing of the detection, apart from the identity of the respective detector element. These parameters are used to construct the level structure of nuclei being investigated following a meticulous processing of the acquired data and its detailed analysis. The maiden instance of using digital signal processing for large detector arrays in the country was realized at the previous (2009-13) campaign of the Indian National Gamma Array (INGA) hosted in TIFR, Mumbai. Subsequent to this first stride there have been efforts to further implement the digital hardware and pulse processing algorithms in the gamma-ray spectroscopy measurements with multi-detector arrays such as INGA. The current presentation aims in elaborating on one such development carried out by the UGC-DAE CSR, Kolkata Centre and being used in the present campaign of the INGA facility at VECC, Kolkata
[en] In order to extend the physics reach of ALICE and other experiments, the LHC is planning for an upgrade of beam energies and beam luminosities during Long Shutdown-2 (LS-2) in the year of 2019 and 2020. The increase in luminosities and hence the interaction rates helps to collect high statistics of data and sustain the advance research in state-of-the-art High Energy Physics (HEP) experiments
[en] The advent of digitizer based pulse processing and data acquisition systems has ushered an era of improved experimental setups, that are compact, fast and capable of handling higher event rates, in the domain of nuclear spectroscopy. One of the recent use of such a system has been accomplished in a campaign of the Indian National Gamma Array (INGA) hosted at the Room Temperature Cyclotron (RTC) of the Variable Energy Cyclotron Centre (VECC), Kolkata. A digitizer based pulse processing and data acquisition system with firmware logic conceptualized by the Kolkata Centre of UGC-DAE CSR and implemented by XIA LLC (USA) in hardware, principally consisting of 12-bit 250 MHz digitizers, was used throughout the campaign. The system has been demonstrated to befit spectroscopic applications, working under both (detector) multiplicity based trigger requirement as well as under condition effecting to a triggerless mode. Around 15 experiments, addressing diverse nuclear structure physics across different mass regions, were carried out using the alpha and the proton beams available from the RTC. The acquired data were processed using a set of codes developed by the UGC-DAE CSR and being analysed by the respective Groups. Efforts are in progress to augment the system with additional features and commence on the next phase of the campaign
[en] In order to potentiate the experiments for studying the exotic nuclei with Brazil Radioactive Ion Beam (RIBRAS), a modular organic scintillation detector (Neutron Wall), with good efficiency and extended solid angle was developed. The detection of neutrons emitted in coincidence with the reaction fragments increases the experimental possibilities and represents one of the most popular techniques in the Nuclear Astrophysics field.The data acquisition system used for the Neutron Wall is obsolete and should be replaced by Versa Module Euro Card Data Acquisition modules. The new scheme will be designed to include the Strip Array and Neutron Wall detectors with maximum readout efficiency, no dead time, data selection and event synchronization. The digitizer modules provide features like zero suppressed readout and overflow suppression. Zero suppression, once enabled, prevents conversion of value, which is lower than user defined threshold. Adding FPGA (field programmable gate array) cards to data acquisition provides pre- and post-algorithmic processing on data.
[en] The Modbus TCP/IP has been a standard industry communication protocol and widely utilized for establishing sensor-cloud platforms on the Internet. However, numerous existing data acquisition systems built on traditional single-chip microcontrollers without sufficient resources cannot support it, because the complete Modbus TCP/IP protocol always works dependent on a full operating system which occupies abundant hardware resources. Hence, a compact Modbus TCP/IP protocol is proposed in this work to make it run efficiently and stably even on a resource-limited hardware platform. Firstly, the Modbus TCP/IP protocol stack is analyzed and the refined protocol suite is rebuilt by streamlining the typical TCP/IP suite. Then, specific implementation of every hierarchical layer is respectively presented in detail according to the protocol structure. Besides, the compact protocol is implemented in a traditional microprocessor to validate the feasibility of the scheme. Finally, the performance of the proposed scenario is assessed. The experimental results demonstrate that message packets match the frame format of Modbus TCP/IP protocol and the average bandwidth reaches to 1.15 Mbps. The compact protocol operates stably even based on a traditional microcontroller with only 4-kB RAM and 12-MHz system clock, and no communication congestion or frequent packet loss occurs.
[en] In previous studies, precise n/γ discrimination algorithm for such detector was developed and it had a better discrimination performance compared to existing pulse height analysis method (PHA method) at various gamma-ray background. However, it has a limitation in terms of separation after signal storage and real-time system is required to be applied to the survey meter. In this study, real-time signal processing system applying the algorithm was manufactured and the performance was evaluated. As a result of performance evaluation in terms of gamma ray elimination and neutron counts, it was found that it has better performance compared to existing PHA method and expansion to the real-time system is possible. It is expected that it will be possible to carry out precise n/γ discrimination by applying the system developed in
[en] This paper describes a method for the measurement of gain and linearity of photomultipliers (PMTs). Gain and linearity are two fundamental parameters to use properly a PMT in several physics experiments. In the developed system light is laser generated and adressed to the PMT through a set of optical fibers. The data acquisition system consists in a commercial 16 channel digitizer coupled to a custom front-end board. With the chosen digitizer the system is scalable to test up to 16 PMTs, with the aid of a light distribution system and a multi-channel version of the front-end board. Data analysis is performed by a custom acquisition software. A 1.5" Hamamatsu PMT is used to validate the system.