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[en] Data buffering between a front-head microprocessor and a minicomputer in real time data acquisition is considered. The minicomputer's data channel is of fixed priority type. Expressions are given to estimate the required buffer lengths. (orig.)
[en] A programme has begun on MAST to replace its ageing CAMAC and VME based data acquisition systems with new modern hardware which, together with several improvements in the supporting infrastructure, will provide support for faster data acquisition rates, longer-pulse operation, faster data access and higher reliability. The main principle of the upgrade was to use commercial off-the-shelf (COTS) hardware and well-established standards wherever possible. CompactPCI or PXI was chosen as the digitiser form factor to replace CAMAC/VME, and Ethernet would be used as the means to access all devices. The modular architecture of the MAST data acquisition software framework has helped to minimise the integration effort required to phase in new subsystems and/or new technologies whilst continuing to use the old hardware in other systems. The software framework was updated to allow more versatile use of the network-attached data acquisition devices. The new data acquisition devices had multiple connector types, which created difficulties with the cable interfacing. To resolve this and provide support for easy substitution, a standard connector interface was chosen, based on the most common connector type and pin-out already in use, and several cable assemblies were produced to connect the proprietary interface of the digitiser to the standard interface block. The in-house IDA-3 data storage format is unable to accommodate the larger file sizes and is increasingly difficult to maintain, so it is to be gradually phased out. The NetCDF-4/HDF5 data standard is being adopted as its replacement, thus reducing in-house maintenance whilst providing a data format that is more accessible to the Fusion community. Several other infrastructure upgrades were necessitated by the anticipated increase in data traffic and volume including the Central Timing System, the MAST Ethernet infrastructure and servers for front-end data processing, data storage and data access management. These improvements have provided higher reliability, faster data retrieval, greater longevity and capacity to extend the MAST pulse length to accommodate the future programme requirements.
[en] A data-acquisition approach with fast digitizers at the earliest possible stage is discussed. Event selection is achieved digitally in an asynchronous, distributed way using modular system components. Experiment tuneup down to the very first level is under full computer control. One of the already realized system components, a fast time digitizer (with 650 ps resolution, 8 channels, 32 bits) is briefly described. (orig.)
[en] We developed a system for data acquisition and analysis, designed around VMEbus and UNIX workstations. The system is designed to be scalable: If we distribute it throughout the network, a thousand channels can be dealt with in the same way as a dozen channels. The issues of choosing and installing amplifiers are also discussed. (orig.)
[en] This paper presents the extension of the data acquisition and control system JDAQ, used at TEXTOR, to allow different data acquisition hardware. The extension was developed for the INCAA-TR10 and INCAA-TR32 recorders. These modules are built in the 'CompactPCI' hardware format. It has been demonstrated that measuring with PCI modules under JDAQ is possible. However, the handling of the modules is not as systematic as measuring with CAMAC modules. General problems with implementation of the PCI modules will be discussed in this paper.
[en] As in any other long-lasting experiment, new and standard activities on Frascati Tokamak Upgrade may require technological updates, especially on the control and data acquisition domain. The present paper will deal with a set of experiences arising from the necessity to replace ageing systems that turned out to be an interesting test-bed for new technologies. The first case study deals with FTU slow control, which is based on a standard three-layer model. The lower layer has been updated in the G1 power supply of the toroidal field, replacing the old Westinghouse PLC with a Siemens-S7. To integrate the new PLC in FTU control system, the open source LibNodave package under Linux operating system has been used. The results are compared to those obtained using the Siemens-S7 commercial library. The second case study regards FTU magnetic measurements. The system proposed will lead to the replacement of the old CAMAC system with a PXI embedded controller, acquiring hundreds of signals. Finally it will be shown how, taking advantage of those technologies, an ITER relevant control and data acquisition architecture can be designed.
[en] The Super-Kamiokande (SK) experiment has been developing an extensive R and D program to develop a technique that would allow tagging of antineutrinos at SK. This technique is based on the simple idea of adding Gadolinium (Gd) to water, a solute with exceptional properties. A 200 ton tank facility is now under construction in a new hall near SK. It simulates the conditions at SK in order to further develop this technique and serve as a ground field to test it. It will have its own water filtration system, photo-multipliers, data acquisition system (DAQ) and other ancillary equipment.
[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] A CAMAC acquisition system is described, which is suitable for high rate data acquisition. The high rate feature is obtained by the use of input FIFO buffer memories both for digital and analog signals. Provision is made for on-line filtering of data by means of a special purpose processor. (orig.)
[en] The setting up and updating of a Moessbauer laboratory imply the acquisition and assembling of different units. Guidelines concerning either the construction or the acquisition of the various parts which compose a Moessbauer spectrometer are given in this paper. (orig.)