Fluid-dynamic and thermo-mechanical analyses of the ITER electron cyclotron Miter bend mirror for the off-centered beam scenario

•A new cooling concept for the ITER EC MB mirror was proposed to better dissipate the deposited power during the mm-wave normal operation.•The off-centered beam configuration obtained in the FALCON facility was used in these analyses.•The maximum temperature for the MB mirror appears on the reflecting surface at the beam center, reaching a value of 174.6ºC.•The comparison between the categorized stresses and the allowable design limits show that the MB mirror design can withstand the expected loads.The ITER Upper Launcher for the Electron Cyclotron system has as primary goal to deliver mm-wave power at 170 GHz at the appropriate rational surfaces to stabilize magneto-hydrodynamic instabilities. Each Upper Launcher is connected to the gyrotrons through eight Transmission Lines. Diamond Window Units located at the port cell ceiling more than a dozen meters from the torus defines a barrier for the ITER primary vacuum at these Transmission Lines, defining the Ex-vessel Waveguide system. The Ex-vessel Waveguide system consists of straight corrugated waveguide components of 50 mm inner diameter with Miter Bends that are used to create a Z-shaped layout in each port cell.