Highly Efficient Gyrotron Mode Converter with a Launcher Changing Angular Spectrum of the Operating Mode
IEEE TRANSACTIONS ON ELECTRON DEVICES(2024)
AV Gaponov Grekhov Inst Appl Phys Russian Acad Sci
Abstract
To minimize diffraction losses and the dimensions of the quasi-optical converter, a unique waveguide launcher is proposed to be used in the output system of a 28-GHz gyrotron operating on the TE-1.2 mode with a small Brillouin angle at its input. The launcher converts the gyrotron operating mode into a Gaussian-like wave beam with an efficiency of more than 98%, propagating with a big Brillouin angle to the axis of the launcher. The launcher is designed using a hybrid synthesis/method of moment (MoM) + multilevel fast multipole algorithm (MLFMA) approach, and two versions of the waveguide launcher are manufactured using two different technologies. The experiment confirmed the high efficiency of the quasi- optical converter.
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Key words
Scattering,Surface waves,Optical waveguides,Gyrotrons,Electromagnetic waveguides,Mirrors,Shape,Reflection,Indexes,Diffraction,Gyrotron,high-power radiation,millimeter waves
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