Dresden 2017 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 7: Focus: Microwave and THz Properties, Developments and Applications of Dielectric Materials

DF 7.4: Topical Talk

Tuesday, March 21, 2017, 11:10–11:40, GER 37

Dielectric diamond window for the ITER EC H&CD Upper Launcher: design, analysis and qualification — •Gaetano Aiello¹, Mario Gagliardi², Giovanni Grossetti¹, Francesco Mazzocchi¹, Andreas Meier¹, Gabriella Saibene², Sabine Schreck¹, Peter Spaeh¹, Dirk Strauss¹, Alessandro Vaccaro¹, and Theo Scherer¹ — ¹Karlsruhe Institute of Technology, Institute for Applied Materials, D-76021 Karlsruhe, Germany — ²Fusion for Energy, E-08019 Barcelona, Spain

The diamond window is a sub-component of the EC H&CD Upper Launcher and it is part of the ITER first vacuum and tritium confinement system while allowing the transmission of high power microwave beams from the gyrotrons into the plasma. The window consists of an ultra-low loss CVD diamond disc brazed to two copper cuffs and this structure is then integrated into a metallic housing by welding. Being a Protection Important Component, the most stringent requirements in the ITER safety, quality, seismic, vacuum and tritium classifications apply. In this work, we present the development of the window design and the qualification process aiming to meet the requirements via the applicable ASME code and a dedicated program. The window is in fact a unique component that cannot be entirely covered by Codes and Standards. At KIT, FABRY-PEROT resonators measure the loss tangent of the diamond disc which is then used as input to the FEM analyses aiming to validate the design. In the context of the OPE467 contract with F4E, technical specifications are approaching the final phase for the manufacturing and testing of two window prototypes.