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High-Efficiency Quasi-Optical Mode Converter for the Coaxial Cavity Gyrotron

Jianbo Jin, Tomasz Rzesnicki, Stefan Kern, Manfred Thumm

Fusion Science and Technology / Volume 59 / Number 4 / May 2011 / Pages 742-748

Technical Paper / Sixteenth Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-16) /

A 2-MW, continuous wave, TE34,19 mode, 170-GHz coaxial cavity gyrotron for the International Thermonuclear Experimental Reactor (ITER) is under development within the European GYrotron Consortium (EGYC). This paper presents the improved design of the quasi-optical mode converter for this gyrotron. The simulation results show that with the improved quasi-optical mode converter, the fundamental Gaussian mode content of the rf beam can be enhanced to 99.1% at the output window plane and the stray radiation in the quasi-optical mode converter could be decreased to 1.2%.

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