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Carbon and nitrogen impurity transport coefficients are determined from gaspuff experiments carried out during repeat L-mode discharges on the Mega-AmpSpherical Tokamak (MAST) and compared against a previous analysis of heliumimpurity transport on MAST. The impurity density profiles are measured on thelow-field side of the plasma, therefore this paper focuses on light impuritieswhere the impact of poloidal asymmetries on impurity transport is predicted tobe negligible. A weak screening of carbon and nitrogen is found in the plasmacore, whereas the helium density profile is peaked over the entire plasmaradius.

Charge dependence of neoclassical and turbulent transport of light impurities on MAST