Abstract
The X-ray continuum emission has been calculated for model Tokamak plasmas, including the effects of impurity ion diffusion and of runaway electrons. Diffusion leads to a reduction in X-ray emission on-axis, compared with the coronal equilibrium model. However, very large increases (several orders of magnitude) can occur off-axis. The enhancement factor over hydrogenic bremsstrahlung is then found to be a two valued function of the diffusion coefficient. When runaway production is significant, large increases of the enhancement factor can occur both on and off-axis and in the thermal region of the spectrum. A situation can occur where this factor is practically independent of Zeff. In addition, measured temperature profiles can become spuriously broad and flat-topped in the presence of runaways.
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