In the framework of ITER diagnostics, the visible and infrared equatorial Wide Angle Viewing System (WAVS, referenced as 55.G1.C0 in ITER Plant Breakdown Structure) plays a key role. Indeed, this system is devoted to monitor the surface temperature of the plasma facing components by infrared thermography and to image the edge plasma emission in the visible range. As a consequence, it is mandatory to verify that WAVS components are able to withstand all the foreseen loads and load combinations. This paper is dedicated to present the methods and results of electromagnetic (EM) and Transient Structural (TS) analyses for determining the loads due to Eddy Currents and the associated stresses and displacements in the in-vessel components of WAVS at its Preliminary Design Review (PDR) stage.

Specifically, the analysed WAVS in-vessel components comprise First Mirror Units, shutters and Hot Dog Legs of the EPP#12 (Equatorial Port Plug). The selected EM loads derive from the IO-assumed worst EM scenario for EPP#12 (specifically a plasma exponential major disruption).

Given the variation maps of the global magnetic field in the regions of interest during the transient, the EM loads have been estimated using a local 3D EM model of the WAVS components by means of the ANSYS Electromagnetics Suite v.19.2, employing the tool ANSYS Maxwell. Successively, the obtained results have been used as inputs to the corresponding TS analyses (carried out using ANSYS Workbench v.19.2). Therefore, the related outcomes can be combined with the set of all other structural studies (i.e. thermal and seismic analyses) to assess the overall mechanical behaviour of the components under study for the WAVS PDR level. Moreover, the results obtained have shown how EM loads are often design driving loads for the WAVS components.

在ITER诊断的框架中，可见光和红外赤道广角观察系统（WAVS，在ITER植物分解结构中称为55.G1.C0）发挥着关键作用。实际上，该系统专用于通过红外热成像法监测面向等离子体的组件的表面温度，并在可见光范围内对边缘等离子体的发射进行成像。因此，必须验证WAVS组件能够承受所有可预见的载荷和载荷组合。本文专门介绍了电磁（EM）和瞬态结构（TS）分析的方法和结果，用于确定WAVS的船内组件中由涡流以及相关应力和位移引起的载荷（初步设计评审（ PDR）阶段。

具体来说，分析的WAVS车载组件包括EPP＃12（赤道端口插头）的第一镜单元，百叶窗和热狗支腿。选定的EM负载来自EPP＃12的IO假定的最坏EM情景（特别是等离子体指数严重破坏）。

给定瞬态过程中感兴趣区域中全局磁场的变化图，可以通过ANSYS Electromagnetics Suite v.19.2使用工具ANSYS Maxwell使用WAVS组件的局部3D EM模型估算EM负载。 。依次将获得的结果用作相应TS分析的输入（使用ANSYS Workbench v.19.2执行）。因此，可以将相关结果与所有其他结构研究（即热分析和地震分析）组合起来，以评估WAVS PDR水平下正在研究的组件的整体机械性能。此外，获得的结果表明，EM负载通常是WAVS组件的设计驱动负载。