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A major issue in developing a fusion reactor is the thermal insulation of the plasma. This is impaired by processes causing local transport of energy away from the hot core of the plasma towards the cold edge. Until now, study of this energy transport has focused on electrons. The subject of this research was ion energy in plasmas where the electrons are heated externally, the ions only through collision with hotter electrons. The first step was to improve ion temperature measurement. Mechanisms responsible for ion heat dissipation were then identified in two ways: by directly comparing experimental and theoretical thermal conductivity results, and by mathematical modelling to determine what ion temperature would result if, for given plasma parameters, ion thermal conductivity were to behave as predicted theoretically. Results for discharges in the LOC and SOC ohmic energy ranges confirmed the neoclassical theory, whereas in results for IOC discharges, simulated temperatures were lower than those obtained experimentally. Transport of ion energy in ohmic discharges without sawtooth activity and lower hybrid plasmas was attributed to the neoclassical mechanism. It was also possible to determine how electrons behave in OH discharges.

Additional information

Authors: SIMMET E E, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 111/198 DE (1994) 178 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
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