A broadband quasi-optical (QO) mode converter for a multi-frequency gyrotron has been designed and tested at Forschungszentrum Karlsruhe (FZK). The launcher is optimized for the TE/sub 22,8/ mode at 140 GHz, but the radiated beams present an almost identically focused pattern for all 9 considered modes between 105 GHz (TE/sub 17,6/) and 143 GHz (TE/sub 23,8/). Combining with a beam-forming mirror system, which consists of a quasi-elliptical mirror and two phase-correcting mirrors, further calculations show that efficiencies of more than 94% have been achieved for converting the rotating high-order cylindrical cavity modes into the usable fundamental Gaussian mode. Low power (cold) measurements show a good agreement with theoretical predictions. This QO mode converter can be used for the broadband operation of a multi-frequency 1 MW gyrotron.
Investigation of a broadband quasi optical mode converter for a multi-frequency 1 MW gyrotron
2004-01-01
165985 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Investigation of a Broadband Quasi-Optical Mode Converter for a Multi-Frequency 1 MW Gyrotron
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