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A novel slow-wave structure (SWS), created for THz vacuum tubes, based on two parallel corrugations in a rectangular waveguide, realizes the conditions for a quasi-cylindrical field distribution, to support the interaction with a circular beam. A design method for THz TWT including the proposed SWS is presented based on a 2-D non-linear in-house code. Validation by 3-D particle-in-cells (PIC) simulator...
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