Electron cyclotron current drive calculated for ITER conditions using different models

The current drive efficiency for the ITER reference scenario 2 has been calculated by the newly developed ray-tracing code TRAVIS for both the upper and the equatorial launchers. For comparison, two adjoint approach models are applied, the high-speed-limit model and a model with the parallel momentum conservation taken into account. It is shown that in the angle range expected as optimal launch angles the momentum conservation correction produces a non-negligible contribution in ECCD, leading to the necessity to revise the previous predictions carefully. Additionally, the scenario with reduced magnetic field is checked. It is shown that the ECCD efficiency (as well as the deposition profile) for the equatorial launcher may be significantly changed due to unwanted absorption at the higher (parasitic) harmonics.