Experimental and theoretical thermal analysis of CVD diamond window assemblies

T. A. Scherer^a, R. Heidinger^a, A. Meier^a, D. Strauss^a, K. Takahashi^b, K. Kajiwara^b, K. Sakamoto^b
aInstitut für Materialforschung IMF-I, Association EURATOM-FZK, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany
^b Plasma Heating Technology Group, Japan Atomic Energy Agency (JAEA), 801-1 Mukoyama, Naka, Ibaraki 311-0193 Japan

An ITER torus window prototype with CVD diamond disks and corrugated waveguides are being investigated by using IR imaging and temperature measuring technique during high power RF microwave loading up to 1 MW at a frequency of 170 GHz at the JAEA gyrotron facility. To evaluate the cooling efficiency of the window design the temperature distribution over the diamond disk area is measured and compared with a theoretical thermal FEM analysis. Design variations of ITER torus windows with inserted corrugated waveguides and a Brewster window configuration will discussed due to stress analysis.

Collaborations

ECH technologies:

B1: ECH Transmission Lines and Launchers for ITER & Other Devices

Development and high power tests of ITER CVD diamond torus windows

1) Institut für Materialforschung IMF-I, Association EURATOM-FZK, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany

Key persons: T. A. Scherer, R. Heidinger, A. Meier, D. Strauss

2) Plasma Heating Technology Group, Japan Atomic Energy Agency (JAEA), 801-1       Mukoyama, Naka, Ibaraki 311-0193 Japan

Key persons: K. Takahashi, K. Kajiwara, K. Sakamoto