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Measurements of the transport of impurity ions in the plasma of a fusion reactor have not been accurate or reliable enough in the past. The aim of this project was to develop a new method of measurement enabling the transport parameters of impurities to be ascertained in greater detail and with better accuracy. In particular, it was possible to investigate radial influences on diffusion and superimposed drift. The method involved the time-modulated introduction of small quantities of gas eous impurities into the plasma. Harmonic analysis of the signals obtained was used to ascertain phases and Fourier amplitudes of the modulation frequency to a greater degree of accuracy. As well as improving accuracy and reducing the disturbance of the plasma, the method greatly simplifies analysis of the results, as individual frequency components can now be observed instead of the total course of events. After developing the theoretical foundation, the procedure was tested on the ASDEX tokamak and transport coefficients successfully measured in relation to various plasma parameters.

Additional information

Authors: KRIEGER K W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 1/257 DE (1990) 107 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
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