Abstract
The plasma heat flow to plasma-facing materials in a well-defined simulated divertor plasma system is investigated experimentally in order to specify the influences of the ion reflection, surface recombination and change in electron energy distribution function on it. A simulated divertor plate (tungsten or carbon), located normally to the magnetic field, was irradiated by hydrogen and helium plasmas. The reduction of the plasma heat flow caused by the ion reflection is clearly shown, to depend on a kind of materials. For the case of tungsten target, the ion energy reflection coefficients obtained experimentally is quantitatively in good agreement with those estimated by the empirical formula.
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