Heavy-impurity transport in the TFR tokamak – comparison of line emission with numerical simulations

Heavy-element ion line emissions are simulated with a numerical code using two adjustable, radius-independent, parameters in the flux density expression: an anomalous diffusion coefficient D A and an inward convective velocity V A . Previously reported results on the laser blow-off injection of V, Cr, and Ni are, thus, interpreted. The quasi-stationary phase of Ohmically heated high-density (n e (0) ≈ 1.5 × 10 14 cm −3 ) discharges is also simulated, thus allowing the plasma impurity content and the radiated power to be calculated. The necessary numerical values of D A and V A are in the range of 2000–4000 cm 2 ·s −1 and 400–800 cm·s −1 , respectively.