The antenna power coupling to the plasma centre and its possible deleterious coupling to the plasma edge are key parameters in an ion cyclotron resonance heating system. The influence on these parameters by the confluence between the slow and the fast magnetosonic waves is studied for the case of large machines. Until now, the modelling of the scrape off layer region has been calculated by ANTITER II, which contains only the fast wave description and where the confluence with the slow wave (S wave) is approximated by the Alfvn resonance. In the present study, a complete modelling of the slow and fast waves is made by ANTITER IV. The modelling by the two codes is compared and shows the important role of the Alfvn and the lower hybrid resonances for the excitation of large fields and associated power deposition at the edge of the plasma even far from the antenna location. The ANTITER IV modelling is thereafter applied to the case of the ITER antenna with a reference density profile and heating parameters. A comparative study is made for the edge power deposition and the excitation of large fields for different toroidal phasing cases of the antenna. This study also takes into account the tilting of the antenna array with respect to the total magnetic field in front of the antenna. If the Faraday screen is field-aligned, the excitation of the S wave occurs at the wave confluence; however, in the case of non-alignment the antenna directly excites the S wave. This effect is studied and quantified. All edge effects, even the direct excitation of S waves, can be strongly reduced by tailoring the current distribution in the straps of the antenna array. Resulting cases for the minimisation of edge power deposition in ITER and the reactor are studied.

与等离子体中心耦合的天线功率及其与等离子体边缘的可能有害耦合是离子回旋共振加热系统中的关键参数。在大型机器的情况下，研究了慢速和快速磁声波汇合对这些参数的影响。到目前为止，刮削层区域的建模由 ANTITER II 计算，其中仅包含快波描述，其中与慢波（S 波）的汇合处由 Alfvn 共振近似。在本研究中，ANTITER IV 对慢波和快波进行了完整的建模。比较了这两个代码的建模，并显示了 Alfvn 和较低的混合共振对于激发大场和等离子体边缘甚至远离天线位置的相关功率沉积的重要作用。ANTITER IV 模型随后应用于具有参考密度分布和加热参数的 ITER 天线的情况。对天线不同环形相位情况下的边缘功率沉积和大场激励进行了比较研究。这项研究还考虑了天线阵列相对于天线前方总磁场的倾斜。如果法拉第屏是场准的，S波的激发发生在波汇合处；然而，在未对准的情况下，天线会直接激发 S 波。研究并量化了这种影响。所有边缘效应，甚至 S 波的直接激励，都可以通过调整天线阵列带中的电流分布来大大降低。研究了在 ITER 和反应堆中最小化边缘功率沉积的结果案例。