Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

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

KFM 8.4: Talk

Tuesday, April 2, 2019, 10:50–11:10, PHY 5.0.20

ECRH system development for nuclear fusion reactors: Antenna design and diamond window implementation — •Dirk Strauss, Theo Scherer, Sabine Schreck, Peter Spaeh, Gaetano Aiello, Andreas Meier, and Francesco Mazzocchi — KIT Karlsruhe, Deutschland

The ITER ECRH system consists of 24 gyrotrons with up to 24 MW millimeter wave heating power at 170 GHz, power supplies, control system, transmission lines, one Equatorial and the four Upper Launchers. With its high frequency and small beam focus the ECRH has the unique capability of driving locally current. While the Equatorial Launcher mainly acts for central heating and current profile shaping, the Upper Launchers aim on suppressing MHD instabilities, especially neoclassical tearing modes triggering plasma disruptions. The Upper Launchers inject millimeter waves through a quasi-optical section. The eight overlapping beams have focal points optimized for suppression of NTMs. Changes in the design include new ex-vessel waveguide components with a reduced aperture and redesigned ultra low-loss CVD diamond windows.