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This paper presents the latest results from a second harmonic gyro-TWA experiment at Strathclyde University. The experiment uses a helically corrugated interaction region and operates at Ka-band. Simulations have been performed to predict the amplifier gain and bandwidth using linear theory. Amplifier stability margin can be improved with the addition of a sever. A sever has been designed and manufactured,...
One-dimensional (1D) periodic structures with a localized defect and operating in the mm and sub-mm wavelength ranges can be formed by machining small perturbations on the waveguide's walls. We demonstrate the applicability of such structures for diverse applications: from particle acceleration to materials research. It is shown that the strong field enhancement inside the sizable lattice defect should...
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