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    Wyświetlanie 1-3 z 3
    Tytuł:
    Development and Experimental Validation of a Correlation Monitor Tool Based on the Endogenous Pulsed Neutron Source Technique
    Autorzy:
    Arkani, M.
    Khalafi, H.
    Vosoughi, N.
    Khakshournia, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/221446.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    endogenous pulsed neutron source experiment
    neutron noise fluctuation
    zero power reactor noise
    Esfahan heavy-water zero power reactor
    neutron correlation
    Opis:
    A correlation measuring tool for an endogenous pulsed neutron source experiment is developed in this work. Paroxysmal pulses generated by a bursts of neutron chains are detected by a 10-kbit embedded shift register with a time resolution of 100 ns. The system is implemented on a single reprogrammable device making it a compact, cost-effective instrument, easily adaptable for any case study. The system was verified experimentally in the Esfahan heavy-water zero power reactor (EHWZPR). The results obtained by the measuring tool are validated by the Feynman-α experiment, and a good agreement is seen within the boundaries of statistical uncertainties. The theory of the methods is briefly initiated in the text. Also, the system structure is described, the experimental results and their uncertainties are discussed, and neutron statistics in EHWZPR is examined experimentally.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 3; 441-461
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an embedded FPGA-based data acquisition system dedicated to zero power reactor noise experiments
    Autorzy:
    Arkani, M.
    Khalafi, H.
    Vosoughi, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/220709.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zero power reactor (ZPR) noise
    time interval measurement
    probability distribution function (PDF)
    field programmable gate array (FPGA)
    data acquisition system (DAS)
    nuclear reactor
    neutron detection
    Opis:
    An embedded time interval data acquisition system (DAS) is developed for zero power reactor (ZPR) noise experiments. The system is capable of measuring the correlation or probability distribution of a random process. The design is totally implemented on a single Field Programmable Gate Array (FPGA). The architecture is tested on different FPGA platforms with different speed grades and hardware resources. Generic experimental values for time resolution and inter-event dead time of the system are 2.22 ns and 6.67 ns respectively. The DAS can record around 48-bit x 790 kS/s utilizing its built-in fast memory. The system can measure very long time intervals due to its 48-bit timing structure design. As the architecture can work on a typical FPGA, this is a low cost experimental tool and needs little time to be established. In addition, revisions are easily possible through its reprogramming capability. The performance of the system is checked and verified experimentally.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 433-446
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Simulation of a Room Temperature HgCdTe Long-Wave Detector for Fast Response - Operating Under Zero Bias Conditions
    Autorzy:
    Martyniuk, P.
    Kopytko, M.
    Madejczyk, P.
    Henig, A.
    Grodecki, K.
    Gawron, W.
    Rutkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221111.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    response time
    unbiased condition
    HgCdTe
    LWIR
    higher operating temperature
    Opis:
    The paper reports on a long-wave infrared (cut-off wavelength ~ 9 μm) HgCdTe detector operating under nbiased condition and room temperature (300 K) for both short response time and high detectivity operation. The ptimal structure in terms of the response time and detectivity versus device architecture was shown. The response time of the long-wave (active layer Cd composition, xCd = 0.19) HgCdTe detector for 300 K was calculated at a level of τs ~ 1 ns for zero bias condition, while the detectivity - at a level of D* ~ 109 cmHz1/2/W assuming immersion. It was presented that parameters of the active layer and P+ barrier layer play a critical role in order to reach τs ≤ 1 ns. An extra series resistance related to the processing (RS+ in a range 5-10 Ω) increased the response time more than two times (τs ~ 2.3 ns).
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 4; 729-738
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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