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Title: Determination of hydrogen/deuterium ratio with neutron measurements on MAST

On MAST, compressional Alfvén eigenmodes can be destabilized by the presence of a sufficiently large population of energetic particles in the plasma. This dependence was studied in a series of very similar discharges in which increasing amounts of hydrogen were puffed into a deuterium plasma. A simple method to estimate the isotopic ratio n{sub H}/n{sub D} using neutron emission measurements is here described. The inferred isotopic ratio ranged from 0.0 to 0.6 and no experimental indication of changes in radial profile of n{sub H}/n{sub D} were observed. These findings are confirmed by TRANSP/NUBEAM simulations of the neutron emission.
Authors:
; ;  [1] ; ;  [2]
  1. Department of Physics and Astronomy, Uppsala University, Uppsala (Sweden)
  2. CCFE, Culham Science Centre, Abingdon (United Kingdom)
Publication Date:
OSTI Identifier:
22308634
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; ALFVEN WAVES; COMPUTERIZED SIMULATION; DEUTERIUM; EIGENFREQUENCY; HYDROGEN; ISOTOPE RATIO; MAST TOKAMAK; MEASURING METHODS; NEUTRON EMISSION; PLASMA