skip to main content

Title: Prospects for measuring the fuel ion ratio in burning ITER plasmas using a DT neutron emission spectrometer

The fuel ion ratio n{sub t}/n{sub d} is an essential parameter for plasma control in fusion reactor relevant applications, since maximum fusion power is attained when equal amounts of tritium (T) and deuterium (D) are present in the plasma, i.e., n{sub t}/n{sub d} = 1.0. For neutral beam heated plasmas, this parameter can be measured using a single neutron spectrometer, as has been shown for tritium concentrations up to 90%, using data obtained with the MPR (Magnetic Proton Recoil) spectrometer during a DT experimental campaign at the Joint European Torus in 1997. In this paper, we evaluate the demands that a DT spectrometer has to fulfill to be able to determine n{sub t}/n{sub d} with a relative error below 20%, as is required for such measurements at ITER. The assessment shows that a back-scattering time-of-flight design is a promising concept for spectroscopy of 14 MeV DT emission neutrons.
Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Department of Physics and Astronomy, Uppsala University, Uppsala (EURATOM-VR Association), SE-75120 Uppsala (Sweden)
Publication Date:
OSTI Identifier:
22308613
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; BACKSCATTERING; CONCENTRATION RATIO; CONTROL; DEUTERIUM; IONS; ITER TOKAMAK; JET TOKAMAK; MEV RANGE; NEUTRON EMISSION; NEUTRON SPECTROMETERS; PLASMA; PROTON RECOIL DETECTORS; SPECTROSCOPY; TIME-OF-FLIGHT METHOD; TRITIUM