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Dendene O, Afanasiev VV, Lushin SV, Chergui AC, Stifutkin AA, Boukerdja L. Study of silicon photomultipliers (SiPM) with organic scintillator for neutron diagnostics of thermonuclear plasma. FUSION ENGINEERING AND DESIGN 2022. [DOI: 10.1016/j.fusengdes.2022.113113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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A technique for the reduction of pulse pile-up effect in pulse-shape discrimination of organic scintillation detectors. NUCLEAR ENGINEERING AND TECHNOLOGY 2020. [DOI: 10.1016/j.net.2019.07.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Uchida Y, Takada E, Fujisaki A, Isobe M, Ogawa K, Shinohara K, Tomita H, Kawarabayashi J, Iguchi T. A study on fast digital discrimination of neutron and gamma-ray for improvement neutron emission profile measurement. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E118. [PMID: 25430297 PMCID: PMC4137813 DOI: 10.1063/1.4891711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2014] [Accepted: 07/18/2014] [Indexed: 06/04/2023]
Abstract
Neutron and γ-ray (n-γ) discrimination with a digital signal processing system has been used to measure the neutron emission profile in magnetic confinement fusion devices. However, a sampling rate must be set low to extend the measurement time because the memory storage is limited. Time jitter decreases a discrimination quality due to a low sampling rate. As described in this paper, a new charge comparison method was developed. Furthermore, automatic n-γ discrimination method was examined using a probabilistic approach. Analysis results were investigated using the figure of merit. Results show that the discrimination quality was improved. Automatic discrimination was applied using the EM algorithm and k-means algorithm.
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Affiliation(s)
- Y Uchida
- National Institute of Technology, Toyama College, 13 Hongo-machi, Toyama 939-8630, Japan
| | - E Takada
- National Institute of Technology, Toyama College, 13 Hongo-machi, Toyama 939-8630, Japan
| | - A Fujisaki
- National Institute of Technology, Toyama College, 13 Hongo-machi, Toyama 939-8630, Japan
| | - M Isobe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - K Ogawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - K Shinohara
- Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0913, Japan
| | - H Tomita
- Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - J Kawarabayashi
- Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - T Iguchi
- Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Shinohara K, Ishii K, Ochiai K, Baba M, Sukegawa A, Sasao M, Kitajima S. Evaluation of two-stage system for neutron measurement aiming at increase in count rate at Japan Atomic Energy Agency-Fusion Neutronics Source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E823. [PMID: 25430388 DOI: 10.1063/1.4893941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In order to increase the count rate capability of a neutron detection system as a whole, we propose a multi-stage neutron detection system. Experiments to test the effectiveness of this concept were carried out on Fusion Neutronics Source. Comparing four configurations of alignment, it was found that the influence of an anterior stage on a posterior stage was negligible for the pulse height distribution. The two-stage system using 25 mm thickness scintillator was about 1.65 times the count rate capability of a single detector system for d-D neutrons and was about 1.8 times the count rate capability for d-T neutrons. The results suggested that the concept of a multi-stage detection system will work in practice.
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Affiliation(s)
- K Shinohara
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - K Ishii
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - K Ochiai
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Baba
- Cyclotron and Radioisotope Center, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - A Sukegawa
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Sasao
- Organization for Research Initiatives and Development, Doshisha University, Kyoto 602-8580, Japan
| | - S Kitajima
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
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Oishi T, Baba M. Development of Pile-up Separation Method Using Digital Signal Processing. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2008.10875867] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ishii K, Shinohara K, Ishikawa M, Baba M, Isobe M, Okamoto A, Kitajima S, Sasao M. Fast neutron-gamma discrimination on neutron emission profile measurement on JT-60U. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10D334. [PMID: 21033854 DOI: 10.1063/1.3496986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A digital signal processing (DSP) system is applied to stilbene scintillation detectors of the multichannel neutron emission profile monitor in JT-60U. Automatic analysis of the neutron-γ pulse shape discrimination is a key issue to diminish the processing time in the DSP system, and it has been applied using the two-dimensional (2D) map. Linear discriminant function is used to determine the dividing line between neutron events and γ-ray events on a 2D map. In order to verify the validity of the dividing line determination, the pulse shape discrimination quality is evaluated. As a result, the γ-ray contamination in most of the beam heating phase was negligible compared with the statistical error with 10 ms time resolution.
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Affiliation(s)
- K Ishii
- Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan.
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Shinohara K, Okuji T, Ishikawa M, Baba M, Itoga T. High repetition rate neutron flux array using digital-signal processing and scintillators for study of high performance plasma at JT-60U. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:10E509. [PMID: 19044494 DOI: 10.1063/1.2971975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Aiming at increasing the count rate capability of the radial neutron collimator system in JT-60U, a digital-signal processing system has been extended to seven channels for data acquisition of stilbene crystal detector using analog-to-digital converters equipped with a fast flash memory. In this method, the detected pulses were postprocessed concerning pulse shape and pulse height. Using this system, the radial neutron collimator system can provide the information on the temporal evolution of emission rate of d-T neutrons and gamma rays as well as d-D neutrons. On the course of the development, the fast and stable handling of the large data around 7 GB is undertaken for a discharge.
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Affiliation(s)
- K Shinohara
- Japan Atomic Energy Agency Naka, Ibaraki 311-0193, Japan
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