Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Focus: Microwave and THz Properties, Developments and Applications of Dielectric Materials

MA 24.4: Topical Talk

Dienstag, 21. März 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 Scherer11Karlsruhe 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.

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