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Summary form only given. A quasi-optical mode converter for the European TE22,6 118 GHz gyrotron was designed. It consists of a launcher with wall deformation, followed by a quasi-elliptical mirror, a plane mirror, and a parabolic mirror. Measurements with the mode converter installed in the gyrotron and with low power mock-up show a double peak output field pattern which was not predicted by simulation...
A design of a quasi-optical mode converter operating at nine modes is described in this paper. The main application for high-power gyrotrons is electron cyclotron resonance heating (ECRH) and plasma stabilization in nuclear fusion devices like tokamaks. The absorption of the microwave in the plasma depends on its frequency and the plasma parameters. Thus having a multi-frequency high-power source...
This plenary paper discusses the present state-of-the-art of high power millimeter wave gyrotron development in EU for electron cyclotron heating and current drive in present and future thermonuclear fusion experiments.
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