Modeling in front of a plasma profile of a set of traveling wave antenna sections in view of the ion cyclotron range of frequencies heating of the fusion reactor

An upgraded version of the fast semi-analytical code ANTITER-II is used to model the traveling wave antenna (TWA) sections of any arbitrary number of radiating straps facing a low coupling plasma profile with their feeding system. The code computes the Y, Z and S matrices of the antenna array from which the performances of the TWA sections and of their feeding system are deduced as a function of the geometrical parameters of the TWA. The model incorporates the feeding of each section by a resonant ring circuit that re-circulates its output power. The cases of straps grounded at one of their ends (L grounding) or in their center (T grounding) are also compared. This model is extended to a number n _B of TWA sections of n _str strapswith arbitrary positions in the y, z plane (i.e. machine wall). The full matrices of the resulting array of n _str n _B straps are derived and connected to the resonant ring circuits feeding each TWA sections to incorporate the feeding in the model. Examples of toroidal and/or poloidal set of sections with T or L grounding and symmetric or asymmetric k _// spectra are analyzed. First conclusions for the design of a set of TWA sections for the reactor are already drawn. (paper)