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.


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    Titel :

    Investigation of a broadband quasi optical mode converter for a multi-frequency 1 MW gyrotron


    Beteiligte:
    Yang, X. (Autor:in) / Arnold, A. (Autor:in) / Borie, E. (Autor:in) / Dammertz, G. (Autor:in) / Drumm, O. (Autor:in) / Koppenburg, K. (Autor:in) / Piosczyk, B. (Autor:in) / Wagner, D. (Autor:in) / Thumm, M. (Autor:in)


    Erscheinungsdatum :

    2004-01-01


    Format / Umfang :

    165985 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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