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Highly Efficient Quasi-Optical Mode Converter for a Multifrequency High-Power Gyrotron

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6 Author(s)
Prinz, O. ; Inst. fur Hochstfrequenztechnik und Elektron., Univ. Karlsruhe, Karlsruhe ; Arnold, A. ; Gantenbein, G. ; Ying-hui Liu
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A highly efficient quasi-optical mode converter with a bandwidth of 38 GHz has been designed and tested. The mode converter combines low-diffraction losses and a Gaussian mode content up to 97% for a set of nine modes in the range of 105 to 143 GHz for a 1-MW CW gyrotron. This was achieved using a dimpled-wall waveguide antenna (launcher), one quasi-elliptical mirror, and two toroidal mirrors. The optimization of the launcher was done using coupled-mode theory. The simulation results show a well-focused Gaussian beam for all nine operating modes. The curvature radii of the toroidal mirrors were determined by Gaussian mode transformation (ABCD-law) and subsequently optimized for a multimode operation. The simulations of the quasi-optical mode converter are based on the electric field integral equation and, thus, are 3-D. Experimental low-power measurements show close agreement with predictions.

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Electron Devices, IEEE Transactions on  (Volume:56 ,  Issue: 5 )