Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 18: Diamond I (joint session KFM/HL)

HL 18.3: Vortrag

Dienstag, 2. April 2019, 10:10–10:30, PHY 5.0.20

Brewster-angle diamond window for microwave application — •Gaetano Aiello1, Theo Scherer1, Thomas Franke2, John Jelonnek1, Andreas Meier1, Dirk Strauss1, Quang Tran3, Christoph Wild4, and Eckhard Woerner41KIT, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, Germany, 76344 — 2EUROfusion Consortium, Boltzmannstrasse 2, Garching, Germany, 85748 — 3Swiss Plasma Center (SPC), EPFL, Lausanne, Switzerland, 1015 — 4Diamond Materials GmbH, Hans-Bunte-Strasse 19, Freiburg, Germany, 79108

The Brewster-angle diamond window is a broadband window solution for the frequency step-tunable gyrotrons in the context of the DEMO EC H&CD system. It consists of an elliptical CVD diamond disk brazed to two copper WGs at the Brewster angle of 67.2° for diamond. This window concept is being investigated for long pulse gyrotron operation at 2 MW power. Main challenges along this path are the production of very large area optical grade diamond disks suited for a 63.5 mm WG aperture, the proper joining of the disks to the WGs and the design of an effective cooling layout. A 63.5 mm WG requires a minimum disk diameter of 180 mm and 2 mm thickness. Available state of the art microwave plasma reactors are not able of growing diamond disks of such size. In collaboration with Diamond Materials GmbH, tests aiming to obtain large disks were thus investigated by different methods and experiments are still ongoing. In this work, the results of these experiments shall be reported, also together with the results of the FEM analyses aiming to investigate different window cooling layouts.

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