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We present an internal mode converter (IMC) design for a 1.5 MW, 110 GHz gyrotron operating in the TE22,6 mode. The launcher, designed using the codes Surf3d and LOT, converts the cavity waveguide mode into a nearly pure Gaussian beam. The Gaussian beam output from the launcher is shaped by a series of 4 smooth, curved mirrors to provide a circular output beam with a flat phase front at the gyrotron...
Modern high power produce power in high-order TE modes. These modes cannot be efficiently transported in a low loss transmission system, which is typically a corrugated waveguide. The current approach is to convert the TE mode to a Gaussian beam inside the tube and then use an external coupling unit to match the Gaussian beam to the HE11 mode in corrugated waveguide. A prototype design for coupling...
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