title: Measurement and simulation of the response function of time of flight enhanced diagnostics neutron spectrometer for beam ion studies at EAST tokamak.
abstract: The 2.5 MeV TOFED (Time-Of-Flight Enhanced Diagnostics) neutron spectrometer with a double-ring structure has been installed at Experimental Advanced Superconducting Tokamak (EAST) to perform advanced neutron emission spectroscopy diagnosis of deuterium plasmas. This work describes the response function of the TOFED spectrometer, which is evaluated for the fully assembled instrument in its final layout. Results from Monte Carlo simulations and dedicated experiments with pulsed light sources are presented and used to determine properties of light transport from the scintillator. A GEANT4 model of the TOFED spectrometer was developed to calculate the instrument response matrix. The simulated TOFED response function was successfully benchmarked against measurements of the time-of-flight spectra for quasi-monoenergetic neutrons in the energy range of 1-4 MeV. The results are discussed in relation to the capability of TOFED to perform beam ion studies on EAST.
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Peng
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Chen
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: T F
authors.initials: TF
authors.lastname: Du
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Z M
authors.initials: ZM
authors.lastname: Hu
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: L J
authors.initials: LJ
authors.lastname: Ge
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Y M
authors.initials: YM
authors.lastname: Zhang
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: J Q
authors.initials: JQ
authors.lastname: Sun
authors.affiliation: Dipartimento di Fisica, Università di Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Gorini
authors.affiliation: Dipartimento di Fisica, Università di Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Nocente
authors.affiliation: Istituto di Fisica del Plasma "P. Caldirola," EURATOM-ENEA-CNR Association, Via Cozzi 53, 20125 Milano, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Tardocchi
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China.
authors.forename: L Q
authors.initials: LQ
authors.lastname: Hu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China.
authors.forename: G Q
authors.initials: GQ
authors.lastname: Zhong
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China.
authors.forename: N
authors.initials: N
authors.lastname: Pu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China.
authors.forename: S Y
authors.initials: SY
authors.lastname: Lin
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China.
authors.forename: B N
authors.initials: BN
authors.lastname: Wan
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Li
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: G H
authors.initials: GH
authors.lastname: Zhang
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: J X
authors.initials: JX
authors.lastname: Chen
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: T S
authors.initials: TS
authors.lastname: Fan