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Iron transport in a confined high-temperature plasma

The neoclassical flux of Fe XXIII is calculated, for the experimental conditions produced in PLT, by using the data on the iron density profiles and the plasma parameters. The flux of Fe XXIII is then evaluated from the continuity equation by using the same data and is found to be, on the average, two orders of magnitude larger than the neoclassical prediction and in the opposite direction. The expressions for purely anomalous trans-port coefficients are derived for this case. Furthermore, a sensitivity analysis is performed to investigate the dependence of the flux obtained from the continuity equation on the uncertainties in the rate coefficients and on some atomic processes not included in the calculations, such as auto-ionization and charge exchange. The dependence on the uncertainties in rate coefficients is found to be the critical one, since uncertainties of a factor of two could yield radially inward or outward fluxes, which are by orders of magnitude larger than the flux computed without uncertainty factors. Finally, linear programming techniques are applied to see if the flux calculated from the continuity equation could coincide with the neoclassical flux for any set of values of the rate coefficients within an uncertainty range of a factor of two. The results indicate that the deviation of the flux from the neoclassical values cannot be limited to a range smaller than ±12 times the neoclassical flux. The experimental accuracy needed in the impurity density measurements is also discussed.