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Title: Tomographic analysis of neutron and gamma pulse shape distributions from liquid scintillation detectors at Joint European Torus

The Joint European Torus (JET, Culham, UK) is the largest tokamak in the world devoted to nuclear fusion experiments of magnetic confined Deuterium (D)/Deuterium-Tritium (DT) plasmas. Neutrons produced in these plasmas are measured using various types of neutron detectors and spectrometers. Two of these instruments on JET make use of organic liquid scintillator detectors. The neutron emission profile monitor implements 19 liquid scintillation counters to detect the 2.45 MeV neutron emission from D plasmas. A new compact neutron spectrometer is operational at JET since 2010 to measure the neutron energy spectra from both D and DT plasmas. Liquid scintillation detectors are sensitive to both neutron and gamma radiation but give light responses of different decay time such that pulse shape discrimination techniques can be applied to identify the neutron contribution of interest from the data. The most common technique consists of integrating the radiation pulse shapes within different ranges of their rising and/or trailing edges. In this article, a step forward in this type of analysis is presented. The method applies a tomographic analysis of the 3-dimensional neutron and gamma pulse shape and pulse height distribution data obtained from liquid scintillation detectors such that n/γ discrimination can be improved tomore » lower energies and additional information can be gained on neutron contributions to the gamma events and vice versa.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ; ; ; ;  [1]
  1. JET-EFDA, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom)
  2. (Italy)
  3. (Sweden)
  4. Department of Physics, Università degli Studi di Milano-Bicocca, Milano (Italy)
Publication Date:
OSTI Identifier:
22253529
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Other Information: (c) 2014 Euratom; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEUTERIUM; ENERGY SPECTRA; GAMMA RADIATION; JET TOKAMAK; LIQUID SCINTILLATION DETECTORS; NEUTRON DETECTORS; NEUTRON EMISSION; NEUTRON SPECTROMETERS; NEUTRONS; PLASMA; PULSE SHAPERS; TRITIUM