Abstract
A compact high power extended interaction oscillator (EIO) is studied with an aim to increase its output power. The cavity is designed, so that its transverse mode is TM <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> and the longitudinal mode is 2π and the operating frequency is 38 GHz. The modulating E <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">z</inf> field is optimized in such a way that it varies ascendingly in the growing z-direction. This gradually growing E <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">z</inf> -field has been found, to have a positive impact on sheet-beam EIO output performance in terms of its output power P <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">out</inf> and beam-wave interaction efficiency. To incorporate the negative influence of skin effect and surface roughness on the output performance the conductivity of background material is taken one-fourth of that of pure copper σ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Cu</inf> . After field optimization the final design output power P <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">out</inf> is predicted to improve from 20.19 kW to 24.98 kW and efficiency is improved from 33% to 40.83%.
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