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A diagnostic method of measuring the fusion rate profile has been developed on ASDEX. The collimated protons and tritons from the d-d fusion reaction are simultaneously detected by a semiconductor counter at a single position in the vacuum vessel for different viewing directions. The detection efficiency profiles for these viewing directions are calculated numerically from the measured currents in the coils and assumed plasma current distributions. Folding the detection efficiency profile with a fusion rate profile yields the proton and triton fluxes to the detector. Comparison with measured fluxes allows a fusion rate profile in agreement with the experimental data to be obtained. In certain cases the detection efficiency profile strongly depends on the plasma current density profile, and information on the current distribution in the plasma can thus be obtained. It is proved that the spectra for rotating plasmas are in accordance with the theory of a rotating thermal plasma. Deviations can only be found in the case of strong vignetting of the detection efficiency by structures in the vacuum vessel.

Additional information

Authors: LEINBERGER U, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPPIII/171 DE (1991) 99 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
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