In Wendelstein 7-X (W7-X), a new ion cyclotron resonance heating (ICRH) antenna will be commissioned during the operational campaign OP2.1. The antenna will have to sustain power loads not only from thermal plasma and radiation but also fast ions. Predictive simulations of fast-ion power loads to the antenna components are therefore important to establish safe operational limits. In this work, the fast-ion power loads from the W7-X neutral beam injection (NBI) system to the ICRH antenna was simulated using the ASCOT suite of codes. Five reference magnetic configurations and five antenna positions were considered to provide an overview of power load behavior under various operating conditions. The NBI power load was found to have an exponential dependence on the antenna insertion depth. Differences between magnetic configurations were significant, with the antenna limiter power load varying between 380 W and 100 kW depending on the configuration. Qualitative differences in power load patterns between configurations were also observed, with the low mirror and low iota configurations exhibiting higher loads to the sensitive antenna straps. The local fast-ion power flux to the antenna limiter was also considered and found to exceed the 2.0 MW m−2 steady-state safety limit only in specific cases. The NBI system might thus pose a safety concern to the ICRH antenna during concurrent NBI-ICRH operation, but additional heat propagation simulations of antenna components are needed to establish more realistic operational time limits.
Wendelstein 7-X（W7-X）中，一个新的离子回旋共振加热（ICRH）天线将在运行阶段OP2.1期间投入使用。该天线不仅需要承受热等离子体和快离子带来的功率负载，还必须应对快离子产生的额外负担。因此，对天线部件上的快离子功率负载进行预测性模拟，对于确定安全运行极限至关重要。本研究利用ASCOT代码套件，模拟了W7-X中性束注入（NBI）系统对ICRH天线的快离子功率负载。研究考虑了五种参考磁场位形和五种天线位置，以全面评估不同运行条件下的功率负载行为。结果表明，NBI功率负载随天线插入深度呈指数依赖关系。不同磁场位形之间的差异显著，天线限制器上的功率负载在380 W至100 kW之间变化，具体取决于位形。此外，不同位形下功率负载的分布模式也存在定性差异，其中低镜像位形和低iota位形在敏感的天线 strap 上表现出更高的负载。局部快离子功率通量在天线限制器上仅在特定情况下超过2.0 MW/m²的稳态安全极限。因此，在NBI与ICRH同时运行的条件下，NBI系统可能对ICRH天线构成安全风险，但需对天线部件进行额外的热传导模拟，以确定更实际的运行时间限制。