Light Impurity transport on Alcator C-Mod
        
        
Accumulation of impurities in a tokamak
        discharge leads to dilution of the fusion fuel and to
        enhanced energy loss. Confluence of the measurement of a
        few characteristic profiles shapes and their prediction by
        turbulence theory provides the opportunity to make progress
        both toward fusion and toward identification of the physics
        of transport.
        
        
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