Analysis of Lithium Driven Electron Density Peaking in FTU Liquid Lithium Limiter Experiments
Szepesi, G. · Romanelli, M. · Militello, F. · Peeters, A. G. · Camenen, Y. · Casson, F. J. · Hornsby, W. A. · Snodin, A. P. · Wagner, D. · team, FTU
Original · EN
The impact of lithium impurities on the microstability and turbulent transport characteristics in the core of a typical FTU Liquid Lithium Limiter (LLL)(Mazzitelli et al., Nucl. Fusion, 2011) discharge during the density ramp-up phase is studied. A non-linear gyrokinetic analysis performed with GKW (Peeters et al.,Comp. Phys. Comm., 2009) accompanied by a quasi-linear fluid analysis is presented. We show that a centrally peaked, high concentration lithium profile contributes to the electron peaking by reducing the outward electron flux, and that it leads to inward turbulent deuterium transport through ion flux separation.
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