Results 1 - 10 of 110
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[en] The plan of the data acquisition (DAQ) scheme in High Energy Physics (HEP) experiments comprises of information transfer from the front-end electronics (FEE) of the detectors placed in experimental cavern to the data storage via the FPGA based data processing units. With major upgrades of the LHC experiments at CERN, the data transmission rates in the DAQ frameworks are expected to reach about few terrabytes per second within the following couple of years. In this paper, the optimization technique is implemented on a latest 20nm Intel Arria-10 FPGA. It is tested for the link rate of three high-speed communication protocols commonly used for data transmission in the HEP experiments. The robustness of the optimization technique has been tested with most stressed and transitional data conditions. The test results and the improvements in the metrics of signal integrity for different link speeds are presented and discussed
[en] Data acquisition system with a flexible architecture for studying multiparameter nuclear reactions, based on the extensive use of the devices with programmable logic, is considered. The technical means of the system and its software are described. (author)
[en] In this study, the effect of yttrium (Y) content on the hot tearing behavior of the AZ91 + xY alloys was investigated with a constrained rod casting (CRC) apparatus which was equipped with a load sensor and a data acquisition system. The microstructure and the morphology of hot cracks on the surfaces of the alloys were observed by a scanning electron microscope (SEM). The results demonstrate that with increasing Y content, the hot tearing susceptibility of AZ91 + xY alloys is decreased, reaching a minimum value when the alloy contains 1.5 wt%Y, and is further increased with further increasing Y content. In other words, AZ91 alloy (without Y) has the highest hot tearing susceptibility, whereas AZ91 + 1.5 wt%Y has the lowest hot tearing susceptibility. The SEM results further indicate that hot tears that take place during the solidification of AZ91 + xY alloys are mainly due to the liquid film and the solidification compensation force. (paper)
[en] In the field of experimental nuclear physics and high energy physics Data Acquisition Systems are used to acquire raw data at highest possible event rates. Although digital systems and VME are now prevalent, the older CAMAC systems are still in use at IUAC and other laboratories to utilize existing hardware. The IUAC experimental and accelerator facilities GPSC, LINAC, HIRA and test laboratories make use of CAMAC. In view of ageing and obsolete CAMAC controllers it has become necessary to provide new commercially available crate controllers in many setups. The software system LAMPS (BARC-TIFR), developed for CAMAC and VME is used extensively in several laboratories in India. Reported in this paper are details of setting up LAMPS data acquisition for two new crate controllers: C111C, an Ethernet CAMAC controller available from CAEN and CCUSB a USB based CAMAC Crate Controller from WIENER
[en] In physics it is frequently needed to precisely measure the count rate of some process. Quite often one needs to account for electronics dead time, pile-up and other features of data acquisition system to avoid systematic shifts of the count rate. In this article we present a statistical mechanism to diminish or completely eliminate systematic errors arising from the correlation between the events. Also we present examples of application of this method to the analysis of "Troitsk nu-mass" and "Tristan in Troitsk" experiments.
[en] Pelletron Laboratory The areas of research within the Pelletron Laboratory are ion–matter interactions and their exploitation in IBA, ion beam modification and ion beam lithography. For IBA, the research focuses on the development of new high performance detectors, digitizing data acquisition systems and the development of IBA software. The ion beam modification focuses mainly on the fabrication of nano- and microsized ion tracks by means of energetic heavy ion beams from a cyclotron. Central to ion beam lithography is the fabrication of nano- and microfluidic high aspect ratio structures to polymers, quartz and glasses.
[en] For several years, on SHELS (Separator for Heavy ELements Spectroscopy) was carried out more dozen experiments, aimed to investigation of characteristics of heavy elements and discover new isotopes. Perfect data acquisition system GABRIELA consists of a 10x10 cm2 DSSSD, 128x128 strips and 8 plats a 6x5cm2 DSSD, 32x32 strips. It detects 70% alpha particles and 90% gamma-quanta, by spontaneous fission, and also accurately to separate events by time (1μs). Complex out 5 coaxial Ge-detectors has good efficiency of gammaquanta registration. The mixing of α- decay with γ- and β-decay spectroscopy allows to investigate single particle states behavior, as well as the structure of little known elements in the Z = 100-104 and N = 152-162 region.
[en] The user customisable VME modules, which are available in market are mostly processor based, where VME IOs are handled by the processor chip and response time is slow. This paper will describe the design and development of a FPGA based VME 64 standard general purpose 6U module and its application for time stamp sharing. This module has front end SFP port for high speed optical communication to other module. The module will also serve as development platform to implement any user level logic for VME board. The module also has future scope for attachment of mezzanine board for further extension of input processing