Benchmarking of LHCD numerical modelling on FTU discharges and application to ITER-FEAT scenarios

set to the experimental values time by time, while the magnetic flux diffusion equation is solved in the presence of the LHCD component calculated by the model. In this paper, this model is applied, first, to the FTU experiment where a test [6] of an LH launcher, suitable to be used in the ITER tokamak environment, has been successfully performed. Such an antenna, called Passive Active Module (PAM) antenna [7], launched about 200KW of power into plasma of 0.4-0.510 20 m -3 . The results of this experiment are detailed in ref. [6]. The LH driven current and the current density profile are calculated and compared to the experimental findings. In particular HXR measurements allow checking the calculated current density profile. Following the experiments, the LHCD by PAM is compared to LHCD by conventional antenna in FTU. After such a benchmarking, modelling of LHCD in ITER FEAT scenarios [8,9] is reported. Parasitic absorption of LH wave power by ! particles is calculated as a function of the fast ! density at the location of the absorption [3]. A quasi-linear (QL) Fokker Planck model for the ! distribution function is used providing the ! distribution function. Such a calculation indicates that a frequency f∀ 5 GHz has to be used in ITER to avoid detrimental effect of ! absorption on the LHCD efficiency. We conclude the analysis of the ITER scenarios [8,9] presenting and discussing the current density profile and the CD efficiency provided by our model. 2.Modelling of the LHCD experiment with PAM launcher