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Nuclear Science, IEEE Transactions on

Issue 2  Part 1 • Date April 2002

 This issue contains several parts.Go to:  Part 2 

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Displaying Results 1 - 25 of 38
  • An online neural network triggering system for the Tile Calorimeter

    Publication Year: 2002 , Page(s): 369 - 376
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (309 KB) |  | HTML iconHTML  

    For the hadronic calorimeter of ATLAS, TileCal, neural processing is used to establish an efficient methodology for the online particle identification in beam tests of calorimeter prototypes. Although beam purity is usually very good for a selected particle type, background from wrong-type particles cannot be avoided and is routinely identified in the offline analysis. The proposed neural system is trained online to identify electrons, pions, and muons at different energy levels and it achieves more than 90% efficiency in terms of particle identification. The neural system is being implemented by integrating it to the readout drive (ROD) of the TileCal. View full abstract»

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  • Conference author index

    Publication Year: 2002 , Page(s): 537 - 538
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    Freely Available from IEEE
  • The environmental monitoring system of VIRGO antenna for gravitational wave detection

    Publication Year: 2002 , Page(s): 405 - 410
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (298 KB) |  | HTML iconHTML  

    The VIRGO antenna for gravitational wave detection is a very sensitive interferometer. All the noise sources are very low and continuously monitored by a complex monitoring system. This is a modular system whose architecture has been designed to guarantee the fulfillment of present and future VIRGO needs. Particular care has been devoted both to the management of probes different in type, sensitivity, and bandwidth distributed along the whole antenna and to the system integration within the main VIRGO data acquisition system architecture. The goal of this system is not only distributed synchronous acquisition, but also an on-line pre-analysis of environmental quantities necessary to implement a real-time data quality control View full abstract»

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  • A general-purpose Java tool for action dispatching and supervision in nuclear fusion experiments

    Publication Year: 2002 , Page(s): 469 - 473
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB) |  | HTML iconHTML  

    In nuclear fusion experiments, the plasma discharge requires a preparation sequence followed by a data acquisition phase. During these phases, the control and data acquisition system is required to carry out a sequence of operations for set up of the various devices, data readout, and on-line computation. An action dispatcher tool must comply with several requirements such as the support for a distributed and heterogeneous environment, a comprehensive user interface for the supervision of the whole sequence, and the need for web-based support. The paper describes the architecture of a general-purpose Java-based tool for action dispatching. The use of the platform-independent Java framework, combined with the generic approach in the architecture definition, satisfies the above requirements. The Java framework has been chosen for the implementation because of its platform-independence, network, and multithreading support. The architecture of the tool has been kept quite generic, thus making the tool adaptable to a variety of operating environments with minimal changes in the application code View full abstract»

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  • Comparison of parallel versus hierarchical systems for data processing in distributed sensor networks

    Publication Year: 2002 , Page(s): 394 - 400
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (319 KB) |  | HTML iconHTML  

    Distributed sensor networks (DSN) often lead to high volumes of data to acquire and the implementation of the data acquisition is highly dependable on the application. In this paper, we define a merit factor (MF), which allows for quantitative comparison of different possible implementations of data acquisition system. Results of the application of this factor to high-energy physics experiments are presented View full abstract»

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  • Controlling front-end electronics boards using commercial solutions

    Publication Year: 2002 , Page(s): 474 - 477
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (225 KB) |  | HTML iconHTML  

    LHCb is a dedicated B-physics experiment under construction at CERN's large hadron collider (LHC) accelerator. This paper will describe the novel approach LHCb is taking toward controlling and monitoring of electronics boards. Instead of using the bus in a crate to exercise control over the boards, we use credit-card sized personal computers (CCPCs) connected via Ethernet to cheap control PCs. The CCPCs will provide a simple parallel, I2C, and JTAG buses toward the electronics board. Each board will be equipped with a CCPC and, hence, will be completely independently controlled. The advantages of this scheme versus the traditional bus-based scheme will be described. Also, the integration of the controls of the electronics boards into a commercial supervisory control and data acquisition (SCADA) system will be shown View full abstract»

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  • MUSE: an integrated trigger and readout control system for CHIMERA

    Publication Year: 2002 , Page(s): 334 - 338
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (193 KB) |  | HTML iconHTML  

    The CHIMERA 4π detector trigger system is described. The trigger decisions are based on a combination of geometrical multiplicity of detected particles and other logic signals. The trigger can manage the buffer memory of the used analog to digital converters. This allows performance of parallel data conversion and readout and substantial improvement of the acquisition system dead-time performances. The trigger module generates all the necessary gate signals for the converters and the control signals necessary to synchronize the readout. It also allows the remote control of the whole system View full abstract»

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  • Real-time procedure for noise uncoupling in laser interferometry

    Publication Year: 2002 , Page(s): 411 - 416
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    A numerical procedure for noise uncoupling is described. The procedure is applied to a Michelson interferometer and is effective in seismic and acoustic noise uncoupling from the output signal of the interferometer. Due to the low data flow coming from the instrumentation, this uncoupling can be performed in real time View full abstract»

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  • CHIMERA data acquisition and computational system using DSP-based VME modules

    Publication Year: 2002 , Page(s): 432 - 436
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (266 KB) |  | HTML iconHTML  

    We have built and tested a computational unit for on-line processing of special algorithms to be embedded in the central processing unit VERSAmodule Eurocard (CPU VME)-crate of the CHIMERA data acquisition system. The computational unit consists of a number of VME digital signal processor (DSP)-based commercial boards delivering 720 MFlops/board View full abstract»

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  • Vertical Monitoring: a data acquisition application for the BaBar experiment

    Publication Year: 2002 , Page(s): 437 - 442
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (267 KB) |  | HTML iconHTML  

    Online Dataflow (ODF) handles data acquisition and processing from the BaBar detector front end electronics through the delivery of complete events to a farm of UNIX nodes. To understand the system, a monitor application, Vertical Monitoring (VMON), has been developed. VMON multicasts UDP packets with performance information from each CPU of the Dataflow system. This information is currently received by a single client on one UNIX node and archived. A ROOT-based GUI is provided on the UNIX application side to control VMON, display the performance of the ODF system in real time and retrieve archived data. VMON is currently used successfully in BaBar to provide diagnostics in the dataflow system and help with projections of future performance View full abstract»

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  • Advanced digital processing for amplitude and range determination in optical RADAR systems [fusion reactor inspection]

    Publication Year: 2002 , Page(s): 417 - 422
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (253 KB) |  | HTML iconHTML  

    An amplitude modulated laser radar has been developed by the Italian Agency for New Technologies, Energy and the Environment (ENEA) for periodic in-vessel inspection in large fusion machines. The viewing system is based on a transceiving optical radar using a radio frequency (RF) modulated single-mode 840-nm wavelength laser beam. The sounding beam is transmitted through a coherent optical fiber to a probe, on the tip of which a focusing optics and suitable scanning system, using a silica prism, steers the laser beam in order to obtain a complete 3-D mapping of the in-vessel surface. This paper describes the digital signal processing system used to modulate the laser beam, as well as to measure both the amplitude of the backscattered laser beam and the phase difference between it and the modulation signal. This information, together with the information on the scanning system position, are acquired and then used by the visualization system to produce both 2-D and 3-D images. The system is based on VME boards and directly acquires and processes in real-time three 79.5-MHz RF signals by using a digital receiver and four digital signal processors. The system principles, the mathematical algorithm, and the system architecture are described hereafter View full abstract»

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  • Track finding at 10-MHz hadronic event rate

    Publication Year: 2002 , Page(s): 347 - 356
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (441 KB) |  | HTML iconHTML  

    Hera-B is a fixed target experiment using a halo target inside the HERA proton ring to generate B mesons in 920 GeV proton-nucleus interactions. The first-level trigger (FLT) of the experiment has to reduce the primary 10-MHz input rate by a factor 200 in less than 10 μs to make it acceptable to the second level trigger (SLT). The trigger strategy is based on the tracking of charged particles and on the reconstruction of their kinematic parameters. The combination of track pairs can also be used for the final decision. A parallel and pipelined set of approximately 60 dedicated boards was designed and built to perform this job. In this paper, the working principle of the system and some results obtained by analyzing the data collected during the run in the year 2000 are described View full abstract»

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  • A remote control system for FPGA-embedded modules in radiation environments

    Publication Year: 2002 , Page(s): 501 - 506
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (271 KB) |  | HTML iconHTML  

    A remote control system has been developed for versa module Eurocard (VME) modules located in a radiation environment. Two new VME modules-the remote controller (RC) and local interface modules-are introduced to mediate between the local host and remote slave modules. These two modules are connected with optical links and the local host can master the remote VME bus to access the slave modules through these intermediate modules. This control system can perform watchdog for field programmable gate array (FPGA)-embedded modules whose configuration data are susceptible to single event upsets (SEUs). The architectural study and first prototyping of this system are discussed View full abstract»

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  • Remote participation infrastructure in the European fusion laboratories

    Publication Year: 2002 , Page(s): 532 - 536
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (172 KB) |  | HTML iconHTML  

    The large experiments in the European fusion community are increasingly run as shared facilities. This is following the lead of the Joint European Torus (JET) Facilities that have been run in this way since the beginning of 2000 under the European Fusion Development Agreement (EFDA). The remote participation (RP) technical infrastructure being put in place for the joint scientific exploitation of the JET Facilities serves as a blueprint for the future shared exploitation of several other large experiments. At the same time the scope of the remote access and remote collaboration is being extended from the purely scientific exploitation to include shared engineering design work for major JET enhancements that are conducted jointly by several laboratories, and for the next-step design work (ITER) as well View full abstract»

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  • The data acquisition system for the infrared cameras on Tore Supra

    Publication Year: 2002 , Page(s): 423 - 427
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (244 KB) |  | HTML iconHTML  

    The data acquisition for the infrared measurement system on Tore-Supra is a key element to ensure the supervision of the new actively cooled plasma-facing components of CIEL (Inner Components and Limiter), which is a major upgrade of Tore Supra. It will allow us to follow the thermal evolution of components of Tore-Supra, in particular the toroidal pumped limiter (LPT) (360°-15 m long) and the five additional heating launchers. When fully installed, the infrared measurement system will be composed of 12 digital 14-bit infrared cameras. They cover a 100-1200°C temperature range, and each picture has a definition of 320 × 240 pixels with a 20 ms time resolution. The objectives of the data acquisition system are real-time recording and analysis of each view element for further postpulse analysis in order to understand the physics phenomenon and ensure the supervision of the plasma facing components, and also to be part of the global feedback control system of Tore Supra View full abstract»

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  • Ethernet-based real-time control data bus

    Publication Year: 2002 , Page(s): 478 - 482
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (193 KB) |  | HTML iconHTML  

    Wendelstein 7-X is designed as a steady-state experiment to demonstrate the fusion reactor relevance of the advanced stellarator concept. The experiment's control and data acquisition will be performed by a distributed system of computers and programmable logic controllers (PLCs). Data of several systems have to be combined flexibly to control the machine, requiring a data exchange on a millisecond time scale between several connected units. A discharge can last up to half an hour, thus, the connections may vary during a discharge. Hence, it is desired to provide control relevant data, e.g., measurands, set points, interlock signals, cyclically via a bus system. The paper will analyze the special quality of control data streams and deduce the basic requirements for a real-time data bus. An Ethernet is a candidate for the data bus since it is a widely used broad-band bus with a foreseeable potential for development. Because of its nondeterministic arbitration algorithm Ethernet is generally considered not to be suited for hard real-time applications. It is possible to circumvent this disadvantage of Ethernet either by using switching techniques or a software token to obtain a reliable base for hard real-time data transport View full abstract»

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  • FPGAs widen the ARGO-YBJ experiment's eyes

    Publication Year: 2002 , Page(s): 401 - 404
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (358 KB) |  | HTML iconHTML  

    The ARGO-YBJ experiment is presently under construction at the Yangbaijing High-Altitude Cosmic Ray Laboratory (4300 m a.s.l), 90 km north to Lhasa (Tibet, People's Republic of China). ARGO will study fundamental issues in cosmic ray and astroparticle physics by detecting small-size air showers. The detector covers 74 × 78 m2 with single layer resistive plate counters (RPCs), surrounded by a partially instrumented guard ring. The ARGO Data Acquisition System is designed around static random access memory (SRAM)-based field programmable gate arrays (FPGAs), in order to achieve a fully reconfigurable architecture. In this environment, the same hardware platform performs different functions provided by companion FPGAs' configuration files. Control and monitoring software exploits a web browser to deliver commands and perform diagnostic tests on the boards. In this paper, we describe the hardware and the software strategies that allow the ARGO DAQ to benefit from the flexible architecture of in-system reconfigurable FPGAs View full abstract»

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  • Designing an S-LINK to PCI interface using an IP core

    Publication Year: 2002 , Page(s): 513 - 515
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (178 KB) |  | HTML iconHTML  

    The S-LINK is a standard that defines the source and destination interfaces of a point-to-point data link. This standard is chosen for data transmission between front-end electronics and readout systems of some ongoing and future experiments at CERN, Geneva, Switzerland. This work presents the S32PCI64 interface that can move data from a 32-bit S-LINK Destination Card to any 32-bit or 64-bit PCI bus running at 33 MHz View full abstract»

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  • A parallel systolic array ASIC for real-time execution of the Hough transform

    Publication Year: 2002 , Page(s): 339 - 346
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (306 KB) |  | HTML iconHTML  

    Many pattern recognition problems can be solved by mapping the input data into an n-dimensional feature space in which a vector indicates a set of attributes. One powerful pattern recognition method is the Hough transform. In reducing the n-dimensional feature space to two dimensions, the coordinate transform can be executed by a systolic array consisting of time-delay processing elements and adders. The application-specific integrated circuit (ASIC) implementation of the Hough transform as a systolic array for real-time recognition of curved tracks in multiwire drift chambers is presented. The array can handle 32 parallel input data streams. It mainly consists of 512 identical programmable processing elements. Sixteen histogram pixels in the feature space are produced in parallel per clock cycle. The ASIC is implemented in 0.6 μm CMOS, two-metal layer technology (CUB) from Austria Micro Systems (AMS) and operates with a clock frequency of 100 MHz. The interconnectivity pattern of the processing elements required to initialize the chip according to the pattern recognition task is computed on the host computer using the Hough-transform equations. This pattern is then downloaded to the chip via the data input lines. The Hough-transform ASIC is suitable for a wide range of pattern recognition applications. The integrated circuit is a powerful building block for systems requiring real-time execution of the Hough transform View full abstract»

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  • Testing ethernet networks for the ATLAS data collection system

    Publication Year: 2002 , Page(s): 516 - 520
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (231 KB) |  | HTML iconHTML  

    This paper reports recent work on ethernet traffic generation and analysis. We use gigabit ethernet network interface cards (NICs) running customized embedded software and custom-built 32-port fast ethernet boards based on field programmable gate arrays (FPGAs) to study the behavior of large ethernet networks. The traffic generation software is able to accommodate many traffic distributions with the ultimate goal of generating traffic that resembles the data collection system of the ATLAS experiment at CERN, Geneva, Switzerland. Each packet is time stamped with a global clock value and, therefore, we are able to compute an accurate measure of the network latency. Various other information collected from the boards is displayed in real time on a graphical interface. This work provides the tools to study a test bed representing a fraction of the 1600 ATLAS detector readout buffers and 600 Level 2 trigger central processing units (CPUs) using a combination of the fast ethernet boards and the gigabit ethernet NICs View full abstract»

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  • Go4 multitasking class library with ROOT

    Publication Year: 2002 , Page(s): 521 - 524
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB) |  | HTML iconHTML  

    In the situation of monitoring an experiment, it is often necessary to control several independently running tasks from one graphical user interface (GUI). Such a GUI must be able to execute commands in the tasks even if they are busy, i.e., getting data, analyzing data, or waiting for data. Moreover, the tasks, being controlled by data streams (i.e., event data samples or slow control data), must be able to send data asynchronously to the GUI for visualization. A multitasking package (C++ class library) that meets these demands has been developed at the Gesellschaft fur Schwerionenforschung (GSI), Darmstadt, Germany, in the framework of a new analysis system, Go4, which is based on the ROOT system [CERN, R. Brun et al]. The package provides a thread manager, a task handler, and asynchronous intertask communication between threads through sockets. Hence, objects can be sent at any time from a task to the GUI or vice versa. At the GUI side, an incoming object is accepted by a thread and processed. In a task, an incoming command is queued by the accepting thread and executed in the execution thread. Utilizing the package one can implement nonblocking GUIs to control one or several tasks processing data in parallel and updating graphical elements in the GUI. The package could also be useful in building data dispatchers or in slow control applications. All components have been tested with Go4 analysis tasks and a very preliminary GUI View full abstract»

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  • Access to industrial process periphery via Java for process control (JFPC)

    Publication Year: 2002 , Page(s): 465 - 468
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (185 KB) |  | HTML iconHTML  

    Using Java for real world I/O requires its availability in real-time (RT) systems. It is widely accepted that in a plain Java environment, RT characteristics get lost and the required programming interfaces are missing. So there are several ongoing standardization efforts for RT Java. An essential aspect (also important for non-RT systems) is the access to external I/Os. The Siemens product Java for process control (JFPC), which is based on the ideas of OLE for process control (OPC) addresses this aspect. It is available under the proprietary RT kernel RMOS and under Windows NT. Forschungszentrum Julich developed different JFPC providers in order to access industrial components via PROFIBUS DP using an experimental version of JFPC under Linux. The paper presents the status of the different standardization efforts for RT Java and the key features of JFPC. It describes the implementation of a JFPC provider for PROFIBUS DP and shows how it can be used to access industrial sensors and actuators. Experiences and performance results are discussed View full abstract»

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  • Performance analysis of the ATLAS Second-Level Trigger software

    Publication Year: 2002 , Page(s): 383 - 388
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (255 KB) |  | HTML iconHTML  

    In this paper, we analyze the performance of the prototype software developed for the ATLAS Second-Level Trigger. The OO framework written in C++ has been used to implement a distributed system which collects (simulated) detector data on which it executes event selection algorithms. The software has been used on testbeds of up to 100 nodes with various interconnect technologies. The final system will have to sustain traffic of ~40 Gb/s and require an estimated number of ~750 processors. Timing measurements are crucial for issues such as trigger decision latency, assessment of required CPU and network capacity, scalability, and load-balancing. In addition, final architectural and technological choices, code optimization, and system tuning require a detailed understanding of both CPU utilization and trigger decision latency. In this paper, we describe the instrumentation used to disentangle effects due to such factors as OS system intervention, blocking on interlocks (applications are multithreaded), multiple CPUs, and I/O. This is followed by an analysis of the measurements and concluding with suggestions for improvements to the ATLAS Trigger/DAQ dataflow components in the next phase of the project View full abstract»

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  • Performance evaluation of the HT-7U data system

    Publication Year: 2002 , Page(s): 428 - 431
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (187 KB) |  | HTML iconHTML  

    The HT-7U data system is being designed to support the HT-7U superconducting tokamak. For the HT-7U to achieve its mission of extremely long pulse and steady-state operation, the HT-7U data system must be flexible and robust. Corresponding to the various operation modes of the HT-7U experiment, a variety of system configurations and workload models are considered. A trace-driven simulation-based method and steady-state operational analysis technique is used for performance evaluation. These analyses show that much better performance may be obtained by applying the performance optimization techniques of fast switching networking, data compression, caching/buffering, pipelining, a real-time operating system, a real-time database, etc View full abstract»

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  • The VINCI instrument software in the very large telescope environment

    Publication Year: 2002 , Page(s): 483 - 490
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (302 KB) |  | HTML iconHTML  

    The European Southern Observatory (ESO) very large telescope interferometer (VLTI) got first fringes on March 17, 2001 at Mount Paranal in Chile. The VINCI instrument has played a key role in the achievement of this important milestone and is a fundamental component for the current VLTI operations. This paper, after a brief introduction of the VLTI and the instrument itself, will focus mainly on control software aspects. It describes the VINCI hardware and software architecture in the context of the whole VLT control concept. Particular emphasis is given to real-time control aspects, data acquisition, distribution of control over several hardware platforms, networks, standardization of hardware and software components, and software configuration control management View full abstract»

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IEEE Transactions on Nuclear Science focuses on all aspects of the theory and applications of nuclear science and engineering, including instrumentation for the detection and measurement of ionizing radiation; particle accelerators and their controls; nuclear medicine and its application; effects of radiation on materials, components, and systems; reactor instrumentation and controls; and measurement of radiation in space.

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