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Publications (12)7.31 Total impact

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    ABSTRACT: A single-width D-sized VXI card has been designed and built to fully instrument one of the new Clover detectors designed for experiments with the EUROGAM array. Each Clover detector consists of four individual germanium (Ge) crystals and an escape suppression shield comprising 16 bismuth germanate (BGO) crystals. The Clover electronics card measures energy and timing data to 13-bit accuracy from each Ge crystal for spectroscopy and measures sum energy and timing for the BGO shield. It also records a complete Ge and BGO hit pattern for each event and performs intelligent hardware escape suppression to exploit the segmented nature of the Clover detectors
    IEEE Transactions on Nuclear Science 01/1996; · 1.22 Impact Factor
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    ABSTRACT: EUROGAM was designed for gamma ray spectroscopy and the simplest mechanism for event detection is to count the number of coincident gamma rays detected in the array which gives a figure of merit to each event. The EUROGAM detector array uses the XIV backplane system for front-end electronics including triggering and readout. The main tasks of the trigger system are described. The trigger system is distributed with an intelligent local trigger in each of the detector electronics channels. Novel aspects of the system are the use of XIV lines to generate and to distribute trigger signals and the distributed nature of the system to allow efficient parallel and pipelined operation with low system dead times. Throughout the design of the trigger system the various design proposals were tested against a few difficult triggers devised by the physicists who intend to use the system. As an example, one of the simpler triggers is considered
    IEEE Transactions on Nuclear Science 11/1992; · 1.22 Impact Factor
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    ABSTRACT: Control and readout of the EUROGAM data acquisition system is performed over the VMEbus incorporated in D size VXI crates. The authors describe the readout controller and the VME modules which together perform data readout, the formatting of event data into blocks, and the concurrent histogramming of data from individual detector-channels
    IEEE Transactions on Nuclear Science 09/1992; · 1.22 Impact Factor
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    ABSTRACT: EUROGAM is an Anglo/French gamma ray detector which will alternate between the tandem Van der Graaf accelerator at Daresbury and the Vivitron at Strasbourg. Because of the very sensitive nature of the electronics for germanium gamma ray detectors, VXIbus (VMEbus extensions for instrumentation) was chosen as the basis for data acquisition. The purpose of the EUROGAM collaboration is to jointly develop and instrument a transportable 4π gamma ray detector based upon an array of up to 70 high-purity germanium (Ge) detectors, each with an associated multielement bismuth germanate (BGO) escape suppression shield. Due to take data in early 1992 and to initially have 45 Ge detectors (phase 1), EUROGAM will spend one year at the SERC's Daresbury Laboratory taking beam from the 20 MV tandem Van der Graaf accelerator. The hardware configuration for the first phase of the EUROGAM data acquisition system is described
    IEEE Transactions on Nuclear Science 09/1992; · 1.22 Impact Factor
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    ABSTRACT: A compact analog-to-digital converter (ADC) system suitable for high-resolution gamma-ray detectors has been developed around the Burr Brown PCM78P 16-b audio ADC. An associated application-specific integrated circuit (ASIC), handling four ADCs, provides sliding scale circuitry, lower threshold adjustment, channel number identification, and zero suppression. The conversion time is 4.5 mu s, and the differential nonlinearity, for 13-b resolution, is less than +or-0.8%.< >
    Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE; 12/1991
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    ABSTRACT: The EUROGAM detector array uses the VXI backplane system for front-end electronics including triggering and readout. The trigger system is distributed, with an intelligent local trigger in each of the detector electronics channels. Novel aspects of the system are the use of VXI lines to generate and to distribute trigger signals and the distributed nature of the system to allow efficient parallel and pipelined operation with low system deadtimes
    Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE; 12/1991
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    ABSTRACT: Application-specific electronics have been developed for the EUROGAM gamma-ray detector. The size of the complete Ge channel from the preamplifier output to the data readout bus has been reduced to 500 cm/sup 3/ by the use of specially designed surface mounted boards, hybrids, and ASICs (application-specific integrated circuits). After presenting an overview of the Ge card, the authors discuss the analog pulse processing shaping amplifier, the readout, the local trigger, the diagnostics and testing facilities, and the setup facilities.< >
    Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE; 12/1991
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    ABSTRACT: Control and readout of the EUROGAM data acquisition system are performed over the VMEbus incorporated in D-size VXI (VME extensions for instrumentation) crates. A crate readout-controller has been developed to read, from acquisition modules within its crate, an event's data using a single, slightly modified, VMEbus block transfer. Readout controllers buffer the data from several events until they can be transferred, over a cable bus defined for this purpose, to VME-based event-building and parameter histogramming systems. The mechanisms that have been defined permit the data for each physical event to be assembled as a contiguous block within VMEbus memory modules, without any need for prior knowledge of which detectors will produce data for an event. The contribution of the readout system to system dead-time has been minimized by the use of three independent levels of readout, with data buffering incorporated at each level. In addition to assembling data into event blocks, the readout system will concurrently create histograms of the data collected from individual detector-channels
    Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE; 12/1991
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    ABSTRACT: Electronics for six EUROGAM BGO shields is integrated onto one VXI (VME extension for instrumentation) D-size module. For each of the six shields, time and energy measurements are processed. As each shield consists of 10 BGO detectors, a 'hit' pattern of the BGO detectors is also built. The output of the very-low-energy discriminator for the anti-Compton shield is transmitted, via the VXI local bus lines, to the corresponding Ge channel in the neighboring VXI module to allow fast suppression to take place.< >
    Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE; 12/1991
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    ABSTRACT: A new data acquisition system designed for a future high-resolution gamma-ray detector array-the Euroball-is described. It will use newly designed high-resolution electronics together with the VXIbus system as the instrumentation bus. The planned electronics and the general structure of the data acquisition system are described in detail. For control and setup of the data acquisition system, Ethernet based communication is planned. The other elements involved in a data acquisition system (readout, graphics, sorting, storage, etc.) are being planned using international standards and a European agreed solution wherever possible. Depending on the possible integration density and the number of channels, the whole system will consist of 10 to 16 VXI crates containing the digitizing electronics and several VME crates for event filter CPUs and data storage control
    IEEE Transactions on Nuclear Science 05/1990; · 1.22 Impact Factor
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    ABSTRACT: Conference Record of the 1991 IEEE Volume 2, Nov 1991 Pages 873 - 878