Abstract
This work reports measurements on mode converters to transform circular electric gyrotron TEg on -mode compositions (mainly TE 02 ) into the linearly polarized hybrid HE 11 wave which is in many respects ideal for use in quasioptical launching systems for electron cyclotron resonance plasma heating by means of high power gyrotrons. Periodically modulated wall mode converter sections (sinusoidal m=0 radius modulation) convert TE on mode mixtures into a nearly pure TE 01 mode with a measured efficiency of about 98 % at 28 GHz. The TE 01 wave is used for long distance transmission through smooth overmoded waveguideswith optimized tapers and corrugated bends. In a second converter with constant diameter and periodically modulated curvature in one plane (m=1 distortion) the circular symmetric TE 01 mode is transferred into the nearly linearly polarized TE 11 mode with an efficiency of about 97 %. The Gaussian HE 11 mode with almost no cross-polarization is produced in a circumferentially corrugated TE 11 to HE 11 mode converter. The overall efficiency of the complete microwave system is about 90 %.
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