The outputs (cw operation, f=301 GHz, P/spl sim/20W) of the Gyrotron FU IV are stabilized up to /spl Delta/P/P/spl sim/1% and /spl Delta/f/spl sim/50 kHz by decreasing the fluctuations of the cathode voltage and the anode voltage (/spl Delta/V/sub k/ /spl sim/ 0.6V, /spl Delta/V/sub a/ /spl sim/ 0.2 V), via introducing smoothing circuits consisting of resistors, induction coils and capacitors. Further stabilization of output frequency (/spl Delta/f< 1 kHz, /spl Delta/f/f<3/spl times/10/sup -9/) is attained by applying phase lock control. A carefully designed cavity resonator with nonlinear up-taper has been developed and implemented in Gyrotron FU VA. The measurements of the radiation patterns have confirmed high-purity mode operations. The output radiation of TE/sub 03/ and TE/sub 13/ modes are converted into bi-Gaussian beams by a quasioptical system.


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    Title :

    High quality operation of a submillimeter wave gyrotron


    Contributors:
    Ogawa, I. (author) / Idehara, T. (author) / Hoshizuki, H. (author) / Myodo, M. (author) / Nagao, K. (author) / Mitsudo, S. (author) / Hori, T. (author)


    Publication date :

    2005-01-01


    Size :

    896870 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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