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Title: Light output function and assembly of the time-of-flight enhanced diagnostics neutron spectrometer plastic scintillators for background reduction by double kinematic selection at EAST

The 2.5 MeV neutron spectrometer TOFED (Time-Of-Flight Enhanced Diagnostics) has been constructed to perform advanced neutron emission spectroscopy diagnosis of deuterium plasmas on EAST. The instrument has a double-ring structure which, in combination with pulse shape digitization, allows for a dual kinematic selection in the time-of-flight/recoil proton energy (tof/E{sub p}) space, thus improving the spectrometer capability to resolve fast ion signatures in the neutron spectrum, in principle up to a factor ≈100. The identification and separation of features from the energetic ions in the neutron spectrum depends on the detailed knowledge of the instrument response function, both in terms of the light output function of the scintillators and the effect of undesired multiple neutron scatterings in the instrument. This work presents the determination of the light output function of the TOFED plastic scintillator detectors and their geometrical assembly. Results from dedicated experiments with γ-ray sources and quasi-monoenergetic neutron beams are presented. Implications on the instrument capability to perform background suppression based on double kinematic selection are discussed.
Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1] ; ;  [2] ;  [3] ;  [4] ; ; ; more »;  [5] « less
  1. School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
  2. Dipartimento di Fisica, Università di Milano-Bicocca, Milano, Piazza della Scienza 3, 20126 Milano (Italy)
  3. (Italy)
  4. Istituto di Fisica del Plasma “P. Caldirola,” EURATOM-ENEA-CNR Association, Via Cozzi 53, 20125 Milano (Italy)
  5. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui (China)
Publication Date:
OSTI Identifier:
22308935
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEUTERIUM; EMISSION SPECTROSCOPY; MEV RANGE; NEUTRON BEAMS; NEUTRON DIFFRACTION; NEUTRON EMISSION; NEUTRON SPECTRA; NEUTRON SPECTROMETERS; PLASMA; PLASTIC SCINTILLATORS; PROTON RECOIL DETECTORS; PULSE SHAPERS; RESPONSE FUNCTIONS; TAIL IONS; TIME-OF-FLIGHT METHOD; TOKAMAK DEVICES; VISIBLE RADIATION