“…GENRAY and MEGA apply cylindrical coordinates (R, φ, z), where R, z are coordinates in the poloidal plane. Tsujii et al [26] showed that the differences in the ray patterns between GENRAY and a full-wave code such as TORLH [30] has been rather small and for that reason the computationally less expensive (but from a mathematical point of view less correct) option GENRAY has been chosen to be applied in the simulation environment. In GENRAY, the toroidal and poloidal power spectrum parameters of the antenna, i.e., the index of refraction, are chosen as ∆n φ = 2, n φ = 6 and ∆n θ = 1.6, n θ = 0.…”