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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] The KM3NeT neutrino telescope is being built on the Mediterranean sea and, once completed, it will be composed by tens of thousands of glass spheres (nodes) including each 31 of small photocathode (3”). The readout and data acquisition system of KM3NeT has to collect, treat and send to shore, in an economic way, the enormous amount of data produced by the photomultipliers and at the same time to provide time synchronization between each node at the level of 1 ns. It is described in the present article all the electronics developed for achieving this goal.
[en] The paper presents a design and construction of a pulse generator for testing of high-resolution nuclear spectroscopy systems based on new method for providing pulses of accurately predetermined amplitudes as well as pulses with uniform amplitude distributions. A stable and accurate pulse generator prototype has been developed based on the new method of DAC Interpolation as described in paper. The system produces the pulses forming uniform amplitude distribution with 1 microvolt step size. It is suitable for calibration of spectroscopy systems with the resolution that can be as high as 16-bit (64K). Precision pulses are produced with 16-bit resolution with adjustable rise time and fall time. Pulse duration ranges from 500 nanoseconds to 100 microseconds. The system is designed using commercially available components such as multiplying DAC and resistor string DAC. The hardware design details and test results are reported in the paper. The pulses with precision amplitudes and uniformly distributed amplitudes can be used for testing of Integral Non-Linearity (INL) and Differential Non-Linearity (DNL) of spectroscopy systems respectively. It is possible to generate any predetermined pulse amplitude distribution using this hardware. The pulse generation system provides import substitution for commercially available imported models. (author)
[en] This thesis is focused on the study of the front-end electronics for one of the large high altitude air shower observatory (LHAASO) detectors, which is the wide field of view Cherenkov telescope array (WFCTA). It covers six main topics from the physical simulation to the implementation of the data acquisition system. First, the principles of cosmic rays and the situation of the LHAASO experiment were reviewed and presented as the foundation of our discussion. Then, physics simulations were made to understand the propagation of cosmic rays in the atmosphere and to figure out the characteristics of the input signal of the electronics. These simulations were also used to deepen the understanding of the specifications of the telescope and to cross-check them. Next, a new PMT model was successfully built to be used for both physical and electronic simulations. This new model and another four different PMT models were compared and discussed in details to reveal their advantages and disadvantages. By using this PMT model, the behavior models for the designs based on the classical electronics and application-specific integrated circuit (ASIC) were built and studied. Both solutions fit the requirements of the telescope, but considering the development of the micro-electronics, the electronics of the future and high-performance telescopes should be based on the ASICs. After that, the selected ASIC, which is PARISROC 2, was evaluated by using the existing application boards. The results showed that those designs cannot fully demonstrate the true performance of the chip. Therefore, a prototype LHAASO-oriented front-end electronic board that is based on ASIC was designed, implemented and fabricated. Several modifications and enhancements were made to improve the performance of the new design. A detailed description of the development is presented in the thesis. Finally, a series of tests have been performed to verify the concept of the design and to evaluate the application board. The preliminary results show the good general performance of the ASIC and that this design nearly meets the specifications of the WFCTA. (author)
[fr]Le travail de these porte sur l'etude de l'electronique front-end pour le telescope WFCTA (Wide Field of View Cherenkov Telescope Array,) qui est l'un des detecteurs de l'observatoire LHAASO (Large High Altitude Air shower Observatory). Le manuscrit de these couvre six themes principaux allant de la simulation physique au developpement d'un nouveau systeme d'acquisition de donnees. Tout d'abord, les principes de la physique des rayons cosmiques et de l'experience LHAASO sont presentes donnant ainsi une introduction sur les sujets discutes dans la these. Des simulations ont ete faites dans le but de comprendre la propagation des rayons cosmiques dans l'atmosphere et d'en deduire les caracteristiques du signal d'entree de l'electronique. Ces simulations ont egalement ete utilisees pour approfondir la comprehension des specifications du telescope et de les verifier. Un nouveau modele de PMT a ete elabore pour etre utilise dans les simulations. Ce nouveau modele est compare aux autres modeles de PMT. Des modeles d'electronique pour les conceptions basees sur les composants electroniques classiques et sur l'ASIC (Application-specific Integrated Circuit) sont construites et etudiees. Ces deux solutions remplissent les specifications du telescope WFCTA. Neanmoins, compte tenu du developpement de la micro-electronique, il est propose que l'electronique des telescopes de haute performance devrait etre basee sur l'ASIC.L'ASIC selectionne, PARISROC 2, est evalue en utilisant des bancs de tests existants. Les resultats montrent que ces bancs de tests ne peuvent pas demontrer pleinement la veritable performance de l'ASIC. Par consequent, une carte electronique front-end prototype qui est basee sur ASIC a ete concue et fabriquee. Plusieurs modifications ont ete apportees pour ameliorer la performance de la nouvelle carte. Une description detaillee de ce developpement est presentee dans la these. Un nouveau systeme d'acquisition de donnees a egalement ete concu pour ameliorer la capacite de lecture de donnees dans le banc de tests de la carte front-end. Enfin, une serie de tests ont ete effectues pour verifier le concept de design et pour evaluer la performance de la carte front-end. Ces resultats montrent la bonne performance generale de l'ASIC PARISROC 2 et que la carte front-end repond globalement aux specifications de la WFCTA. Base sur les resultats de ce travail de these, un nouveau ASIC, mieux adapte pour les telescopes de type WFCTA, a ete concu et est actuellement en cours de fabrication. (auteur)
[en] X-ray fluorescence (XRF) scan methodology is important for elemental mapping of samples at a synchrotron radiation facility. To save the experiment time and improve the experiment efficiency, one should develop an efficient XRF scan method. In this paper, a new scan mode is presented. It can map arbitrary-shaped areas without stopping the motors. The control and data acquisition system integrates motor controlling, detector triggering, and data acquisition and storage. The system realizes the arbitrary-shaped 2D-mapping and fluorescence data acquisition synchronously. SR-XRF mapping has been performed with a standard gold mask to verify the validity of this method at beamline BL15U1 of the Shanghai Synchrotron Radiation Facility. The results show that this method reduces the total scan time and improves the experiment efficiency. (authors)
[en] In order to satisfy the requirements of beam measurement in the heavy ion medical machine and other small nuclear physics experiments, we designed and built a nuclear instrumentation module-based data acquisition system. This is composed of a set of functional modules and a purpose-built bus. One of the modules operates as a master, collecting data from the other slave modules. It then sends the data to the back-end computer via Ethernet.In addition to the hardware, dedicated software has been designed and implemented. In this paper, we provide a detailed description of the architecture of the system, the data frame, and the software. The bus is the central part of the system. It can transmit data from the slave modules to the master at 33 MB/s. The frame used to transmit the data also ensures its integrity and monitors the hardware architecture. The client software is designed to process data in real time and store data on a hard disk for later analysis. (authors)
[en] Magneto-acousto-electrical tomography (MAET) is an imaging modality to image the electrical conductivity of biological tissues. It is based on electrical current induction by using ultrasound under a static magnetic field. The aim of this study is to develop a data acquisition system for MAET based on magnetic field measurements. The static magnetic field is generated by six permanent neodymium magnets. A 16-element linear phased array (LPA) transducer is utilized to generate acoustic pressure waves inside the phantom. To measure the magnetic field intensity generated by the induced currents, contactless receiver sensors are developed using two similar disk multiple layer coils, which are Helmholtz coil sensor. Physical properties and electrical characteristics of the sensors are assessed. A two-stage cascaded amplifier is designed and utilized in the receiving system. The gain of the cascaded amplifier at 1 MHz is adjusted to be 96 dB. Experimental studies are conducted with two different phantoms, having 3 S m−1 and 58 S m−1 electrical conductivity, respectively. A-scan and B-scan images of phantoms are obtained with the LPA transducer. Comparison of the ultrasound (A-scan) and MAET signals reveals that 3 S m−1 conductive inhomogeneity can be detected with this data acquisition system. Furthermore, the front and rear interfaces of an inhomogeneity () of 58 S m−1 conductivity are detectable. (paper)
[en] An extensible high-speed accelerator data acquisition system (ADAS) for the Dragon-I linear induction accelerator has been developed. It comprises a VXI crate, a controller, four data acquisition plug-ins, and a host computer. A digital compensation algorithm is used to compensate for the distortion of high-speed signals arising from longdistance transmission. Compared with the traditional oscilloscope wall, ADAS has significant improvements in system integration, automation, and reliability. It achieves unified management of data acquisition and waveform monitoring and performs excellently with a 107-ps high-accuracy trigger and 32-channel signal monitoring. In this paper, we focus on the system architecture and hardware design of the ADAS, realization of the trigger, and digital compensation algorithm. (authors)
[en] To improve the accuracy and usability of the superconducting electron cyclotron resonance ion source with advanced design in Lanzhou (SECRAL), an upgraded version of the control system was designed and tested. This paper details the architecture of the optimized control system and presents the results of its use in the long-term operation of the accelerator. The control system software, based on Visual C++, was developed following the model-view-controller architecture design pattern. The data acquisition system was based on a field-programmable gate array integrated circuit. In addition, control strategies were optimized for higher operational stability. The upgraded control system was tested with a U33+ ion beam at SECRAL, where it provided a data acquisition time of less than 1 ms. The fast reaction time and highprecision data processing during beam tuning verified the stability and maintainability of the control system. (authors)
[en] The variety of research being conducted at the instruments on the external beams of the IBR-2 pulsed research reactor in Frank Laboratory of Neutron Physics of Joint Institute for Nuclear Research (FLNP JINR) leads to a variety of requirements for detectors. This leads to the necessity of developing a variety of detectors in the Laboratory (gaseous 3Hebased detectors: 1D and 2D multi-wire proportional chambers (MWPC), ‘ring’ detectors; 6Li-scintillator-based detectors with wavelength shifting fibers, detectors and monitors with solid 10B converters etc.). This article describes the neutron detection systems developed and used at the instruments, as well as the current status and projects carried out at FLNP on the development of detectors and data acquisition systems. (author)