Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 18: Diamond II + Poster

KFM 18.7: Poster

Mittwoch, 14. März 2018, 16:50–17:30, E 124

Torus Diamond Window for ITER - R&D and Qualification activities for a Protection Important Component — •Sabine Schreck, Gaetano Aiello, Stefan Dieterle, Andreas Meier, Dirk Strauss, and Theo Scherer — Karlsruher Institut für Technologie

The diamond window is part of the ITER ECRH Upper Launcher system and consists of an ultra-low loss CVD diamond disk mounted in a system of metallic parts. The window has to fulfil adequate transmission capability for high power mm-waves and it serves as primary vacuum and tritium boundary of the ITER vacuum vessel. Classified as Protection Important Component high requirements for quality and safety apply. As the window cannot be entirely covered by codes and standards an ad-hoc qualification program is required, including prototyping and previous R&D. Diamond disks with a low dielectric loss tangent <2*10-5), a diameter of 65 mm and a thickness of 1.11 mm are planned to be integrated into the window housing. This thickness satisfies the resonance condition for the 170 GHz beam, ensuring a high transmission. But the disks also need to be validated with respect to the mechanical loads, especially to the pressure loads. R&D activities have been performed with the aim to verify the resistance of the disk against these loads. Flexural strength measurements of diamond disks (D = 30 mm, d = 1.11 mm) have been executed using a ring to ring set-up, giving information on the failure behaviour. Further, high pressure tests up to 2 bar of a mock-up (disk brazed to a copper cuff) are under examination.