Grooved CVD diamond windows: Grooves´ profiles and structural simulations

CVD diamond is a well known excellent low loss material (tan δ ≤ 10^-5) for microwave transmission e.g. in fusion reactors for the ECRH&CD system. Laser processing of diamond discs allows the artificial formation of grooves on diamond disc surfaces. A potential application is the design of windows with a surface finish offering an increased bandwidth. As grooves with sharp edges and corners might lead to local stress accumulation beyond tolerable limits, the method has been checked by FEM analyses. The results are here summarized.