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Title: Deuterium density profile determination at JET using a neutron camera and a neutron spectrometer

In this work we estimate the fuel ion density profile in deuterium plasmas at JET, using the JET neutron camera, the neutron time-of-flight spectrometer TOFOR, and fusion reactivities modeled by the transport code TRANSP. The framework has been tested using synthetic data, which showed that the density profile could be reconstructed with an average accuracy of the order of 10 %. The method has also been applied to neutron measurements from a neutral beam heated JET discharge, which gave n{sub d}/n{sub e} ≈ 0.6 ± 0.3 in the plasma core and n{sub d}/n{sub e} ≈ 0.4 ± 0.3 towards the edge. Correction factors for detector efficiencies, neutron attenuation, and back-scattering are not yet included in the analysis; future work will aim at refining the estimated density.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. EURATOM-VR, Department of Physics and Astronomy, Uppsala University (Sweden)
  2. Department of Physics, Università degli Studi di Milano-Bicocca, Milano (Italy)
  3. (United Kingdom)
Publication Date:
OSTI Identifier:
22308631
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; 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; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; ATTENUATION; BACKSCATTERING; DENSITY; DEUTERIUM; ION DENSITY; JET TOKAMAK; NEUTRON CAMERAS; NEUTRON SPECTROMETERS; PLASMA; REACTIVITY; T CODES; THERMONUCLEAR REACTIONS; TIME-OF-FLIGHT SPECTROMETERS