title: A study on fast digital discrimination of neutron and gamma-ray for improvement neutron emission profile measurement.
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.
authors.affiliation: National Institute of Technology, Toyama College, 13 Hongo-machi, Toyama 939-8630, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Uchida
authors.affiliation: National Institute of Technology, Toyama College, 13 Hongo-machi, Toyama 939-8630, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Takada
authors.affiliation: National Institute of Technology, Toyama College, 13 Hongo-machi, Toyama 939-8630, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Fujisaki
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Isobe
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ogawa
authors.affiliation: Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0913, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shinohara
authors.affiliation: Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tomita
authors.affiliation: Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Kawarabayashi
authors.affiliation: Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Iguchi