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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 8: Diamond I (joint session KFM/HL)

KFM 8.1: Vortrag

Dienstag, 2. April 2019, 09:30–09:50, PHY 5.0.20

The ITER Diamond Window - Qualification Program Development of a Safety Important Component — •Sabine Schreck, Gaetano Aiello, Andreas Meier, Theo Scherer, and Dirk Strauss — Karlsruhe Institute of Technology, Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1,

An important component of the ITER ECRH Upper Launcher system is the torus diamond window, which serves as primary vacuum and tritium boundary of the ITER vacuum vessel and allows the transmission of high power mm-waves coming from the gyrotrons into the plasma. The window consists of an ultra-low loss CVD diamond disk mounted in a system of metallic parts and is integrated into the transmission line system. Because of its confinement function the window is classified as Protection Important Component (PIC) and high requirements for quality and safety apply. An ad-hoc qualification program is required for this specific component because it cannot be entirely covered by codes and standards.

Diamond disks with a diameter of about 70 mm and a thickness of 1.11 mm (resonance thickness for 170 GHz) will be used and need to be qualified with respect to their mm-wave transmission capability and mechanical stability. Qualification procedures are also to be established for the joining of the disk to the metallic structure, which is performed by brazing and finally for the qualification of the complete housing made of metallic parts, that are welded together.

The status of the window qualification program will be given together with results of already performed prototype tests.