Results 1 - 10 of 171
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[en] Here we detail the new data acquisition system (DAS) developed for the CSIRO Nuclear Microprobe primarily to handle large detector arrays and to work in tandem with the Maia detector system. Both systems use HYMOD FPGA-based processors. The current DAQ system and its microscopy suite and beam handling have been integrated with the HYMOD system(s) to facilitate easy access to the either system. Examples of the new scanning modes available with the combined system are highlighted on a complex Cambrian black shale sample from the Yangtze basin in Southern China.
[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] 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 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 this paper, we report the development of a bunch-by-bunch beam position acquisition system. Through a wideband synthesizer of PLL, the system realizes synchronous clock of bunch signal. Based on the high-performance FPGA hardware DAQ environment, four-channel raw data of beam signal can be achieved. Test results in the SSRF storage ring show that the system can obtain beam position of single bunch with the resolution of 10 μm and multi-bunch instability can be observed. (authors)
[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] 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.
[en] Replacing your accelerator’s timing system with a completely different architecture is not something that happens very often. Perhaps even rarer is the requirement that the replacement not interfere with the accelerator’s normal operational cycle. In 2011, The Los Alamos Neutron Science Center (LANSCE) b egan the purchasing and installation phase of a nine-year rolling upgrade project which will eventually result in the complete replacement of the low-level RF system, the timing system, the industrial I/O system, the beam-synchronized data acquisition system, the fast-protect reporting system, and much of the diagnostic equipment. These projects are mostly independent of each other, with their own installation schedules, priorities, and time-lines. All of them, however, must interface with the timing system. (author)