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High-gain wide-band gyrotron traveling wave amplifier with a helically corrugated waveguide

Bratman, V L and Cross, A W and Denisov, G G and He, W and Phelps, A D R and Ronald, K and Samsonov, S V and Whyte, C G and Young, A R (2000) High-gain wide-band gyrotron traveling wave amplifier with a helically corrugated waveguide. Physical Review Letters, 84 (12). pp. 2746-2749. ISSN 0031-9007

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First bandwidth measurements of a novel gyrotron amplifier are presented. The coupling between the second harmonic cyclotron mode of a gyrating electron beam and the radiation field occurred in the region of near infinite phase velocity over a broad bandwidth by using a cylindrical waveguide with a helical corrugation on its internal surface. With a beam energy of 185 keV, the amplifier achieved a a maximum output power of 1.1 MW, saturated gain of 37 dB, linear gain of 37 dB, saturated bandwidth of 8.4 to 10.4 GHz (21% relative bandwidth), and an efficiency of 29%, in good agreement with theory.