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Nuclear Science, IEEE Transactions on

Issue 5 • Date Oct 1996

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Displaying Results 1 - 9 of 9
  • New data acquisition system for the focal plane polarimeter of the Grand Raiden spectrometer

    Page(s): 2488 - 2491
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    This paper describes a new data acquisition system for the focal plane polarimeter of the Grand Raiden spectrometer at the Research Center for Nuclear Physics (RCNP) in Osaka, Japan. Data are acquired by a Creative Electronic Systems (CES) Starburst, which is a CAMAC auxiliary crate controller equipped with a Digital Equipment Corporation (DEC) J11 microprocessor. The data on the Starburst are transferred to a VME single-board computer. A VME reflective memory module broadcasts the data to other systems through a fiber-optic link. A data transfer rate of 2.0 Mbytes/s between VME modules has been achieved by reflective memories. This rate includes the overhead of buffer management. The overall transfer rate, however, is limited by the performance of the Starburst to about 160 Kbytes/s at maximum. In order to further improve the system performance, we developed a new readout module called the Rapid Data Transfer Module (RDTM). RDTM's transfer data from LeCroy PCOS III's or 4298's, and FERA/FERET's directly to CES 8170 High Speed Memories (HSM) in VME crates, the data transfer rate of the RDTM from PCOS III's to the HSM is about 4 Mbytes/s View full abstract»

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  • A simple multiprocessor management system for event-parallel computing

    Page(s): 2457 - 2464
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1276 KB)  

    Offline software using Transmission Control Protocol/Internet Protocol (TCP/IP) sockets to distribute particle physics events to multiple UNIX/RISC workstations is described. A modular, building block approach was taken that allowed tailoring to solve specific tasks efficiently and simply as they arose. The modest, initial cost was having to learn about sockets for interprocess communication. This multiprocessor management software has been used to control the reconstruction of eight billion raw data events from Fermilab Experiment E791 View full abstract»

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  • A look at the phenomenon of charge multiplication in silicon radiation detector within the concept of dynamic focusing of the electric field

    Page(s): 2496 - 2500
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    The spectra of 34S and 40Ar ions measured with silicon detectors were analyzed within the concept of dynamic focusing of the electric field. The ionization constant b was obtained for different fields. An estimation of the hot electrons temperature was carried out. A reasonable scenario for the development of charge multiplication process is suggested, taking into account the influence of initial electron-hole concentration on the formation of the hot carriers subsystem View full abstract»

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  • An ISPA camera for beta radiography

    Page(s): 2477 - 2487
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (996 KB)  

    We have developed a new type of beta camera based on an imaging silicon pixel array (ISPA) tube combined with planar plastic scintillators or with SiY2O5:Ce scintillating powder. The ISPA tube consists of a photocathode viewed at 3 cm distance by a silicon anode divided into 1024 rectangular (75 μm×500 μm) detector pixels, each bump-bonded to its equally sized electronic pixel. Depending on the beta detector thickness we achieved spatial resolutions (FWHM) between 105-μm (63Ni source and 30-μm-thick plastic scintillator) and 240-μm (90Sr-90Y source and 120-μm-thick plastic scintillator) by covering the detectors with brass templates. With their four 60-μm-wide slits oriented parallel to the long pixel edges, we simulated small-sized beta strips. The impact of detector thickness is explained by multiple scattering, angular aperture of the template slits, and scintillating light distribution at the ISPA photocathode. Beta detection sensitivities were measured with calibrated 3H (tritium)- and 14C-Amersham microscale sources. They amount to 0.1 Bq (3H) with 150 min counting time and to 0.025 Bq ( 14C) with 180 min counting time View full abstract»

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  • Centroid and full-width at half maximum uncertainties of histogrammed data with an underlying Gaussian distribution-the moments method

    Page(s): 2501 - 2508
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    The effect of approximating a continuous Gaussian distribution with histogrammed data are studied. The expressions for theoretical uncertainties in centroid and full-width at half maximum (FWHM), as determined by calculation of moments, are derived using the error propagation method for a histogrammed Gaussian distribution. The results are compared with the corresponding pseudo-experimental uncertainties for computer-generated histogrammed Gaussian peaks to demonstrate the effect of binning the data. It is shown that increasing the number of bins in the histogram improves the continuous distribution approximation. For example, a FWHM⩾9 and FWHM⩾12 bins are needed to reduce the pseudo-experimental standard deviation of FWHM to within ⩽5% and ⩽1%, respectively, of the theoretical value for a peak containing 10000 counts. In addition, the uncertainties in the centroid and FWHM as a function of peak area are studied. Finally, Sheppard's correction is applied to partially correct for the binning effect View full abstract»

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  • Elongate X-ray detectors for application in security inspection systems

    Page(s): 2509 - 2511
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    We have developed, manufactured, and investigated a novel type of long X-ray detector up to 1000 mm long with two exit windows. The sensitive element of the detector is an elongated polished rectangular plate of inorganic scintillator. The detector is highly sensitive to X-rays in the energy region 50-250 keV. The factors influencing the sensitivity and longitudinal uniformity of the detector response have been considered View full abstract»

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  • Limitations on MOSFET dosimeter resolution imposed by 1/f noise

    Page(s): 2492 - 2495
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    A sensitive microcomputer-controlled MOSFET-based dosimeter system has been constructed to examine the effects limiting the ability of MOSFET dosimeters to detect very small radiation doses. It is shown that the dose resolution of this system is limited by 1/f noise in the sensor MOSFET's themselves. Doses below 1 mGy (100 mrad) can be detected. Structural changes to the sensor MOSFET's that might provide further improvements in resolution through reduction of 1/f noise are discussed View full abstract»

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  • Cathode-follower RF system for proton synchrotron and compressor rings

    Page(s): 2512 - 2515
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    A model RF system with a cathode-follower was tested in its two operational modes without beam. One was for a synchrotron, where the frequency was modulated at 40 Hz; the other was for a compressor ring, where a barrier bucket was generated. Contrary to a simple theory on the inherent instability of the cathode-follower, the RF generation was quite stable in a wide frequency range View full abstract»

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  • A fast, programmable, stand-alone pulse generator emulating spectroscopy nuclear events

    Page(s): 2465 - 2476
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    The design of a fast, programmable, stand-alone pulse generator emulating spectroscopy nuclear events is described. The generator is one unit in a system aiming to test the validity of the simulation and theoretical work relating to the shaping, acquisition, and processing of spectroscopy signals in different experimental situations arising from different technical and scientific fields. The generator output, which also includes piled-up shapes, can be used in many different ways. For example, it can be used: (1) as an input to a charge sensitive preamplifier and shaping amplifier system; (2) as an input to a module for real-time digital shaping of spectroscopy pulses; and (3) it can generate a digital sequence emulating a digitally sampled analog pulse. The signals that it can emulate include those from simple charge sensitive preamplifiers, from more refined analog shapers, and the signals generated directly from scintillation detectors. The main element of the generator is the Analog Devices 21060, a fast and flexible digital signal processor (DSP). This paper considers various generator configurations arising from the need to reach a compromise among generator speed, shape resolution, and memory requirements. It is possible to program both the emulated average counting rate and the time interval between two consecutive samples (tns) using a predetermined pulse shape. The minimum tns value is equal to 10 ns in parallel configurations View full abstract»

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Aims & Scope

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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