Berlin 2024 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: KFM Poster Session
KFM 9.9: Poster
Montag, 18. März 2024, 18:00–20:00, Poster E
Synthetic diamond for windows of the Heating & Current Drive System of ITER — •Sabine Schreck1, Gaetano Aiello1, Pablo Estebanez2, Andreas Meier1, Theo Scherer1, Dirk Strauss1, Christoph Wild3, and Eckhard Wörner3 — 1Karlsruhe Institute of Technology, Institute for Applied Materials, 76021 Karlsruhe, Germany — 2Fusion for Energy, 08019 Barcelona, Spain — 3Diamond Materials GmbH & Co. KG, 79108 Freiburg, Germany
With the aim to heat and stabilize the plasma of the ITER research reactor microwave radiation of around 1 MW power needs to be guided from gyrotrons into the plasma. This requires a number of windows that guarantee vacuum tightness, tritium confinement and high microwave transmission. The key component of such windows is a transparent disk made of synthetic polycristalline diamond. Produced by an optimized microwave plasma assisted chemical vapor deposition (MPA-CVD) process, and after a specific post-processing the disks (D=70mm, d=1,11mm) typically exhibit a very low loss tangent (< 2*10 E-5). Because of the windows safety function each single disk, manufactured by Diamond Materials, needs to pass a qualification process, including the determination of the dielectric loss at disk center and its distribution over the disk area. At KIT dedicated Fabry-Perot resonators are used for the loss measurements. Further, optical inspections with a digital microscope and a determination of possible polarization effects are performed. Under a contract with F4E more than 25 disks (out of 60) have been already qualified and first conclusions can be made.