A study on fast digital discrimination of neutron and gamma-ray for improvement neutron emission profile measurement

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4891711· OSTI ID:22308638

Takada, E.; Fujisaki, A. ^[1]; Isobe, M. ^[2]; Ogawa, K. ^[2]; Shinohara, K. ^[3]; Tomita, H.; Kawarabayashi, J.; Iguchi, T. ^[4]

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1. National Institute of Technology, Toyama College, 13 Hongo-machi, Toyama 939-8630 (Japan)
2. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)
3. Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0913 (Japan)
4. Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 (Japan)

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.

• OSTI ID: 22308638
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALGORITHMS
GAMMA RADIATION
MAGNETIC CONFINEMENT
MEASURING METHODS
MEMORY DEVICES
NEUTRON EMISSION
NEUTRONS
PARTICLE DISCRIMINATION
PERFORMANCE
PROBABILISTIC ESTIMATION
PROCESSING
SAMPLING
SIGNALS
THERMONUCLEAR DEVICES