High-Gain Wide-Band Gyrotron Traveling Wave Amplifier with a Helically Corrugated Waveguide

V. L. Bratman; A. W. Cross; G. G. Denisov; W. He; A. D. R. Phelps; K. Ronald; S. V. Samsonov; C. G. Whyte; A. R. Young

doi:10.1103/PhysRevLett.84.2746

High-Gain Wide-Band Gyrotron Traveling Wave Amplifier with a Helically Corrugated Waveguide

V. L. Bratman, A. W. Cross, G. G. Denisov, W. He, A. D. R. Phelps, K. Ronald, S. V. Samsonov, C. G. Whyte, and A. R. Young

Phys. Rev. Lett. 84, 2746 – Published 20 March 2000

Abstract

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 maximum output power of 1.1 MW, saturated gain of 37 dB, linear gain of 47 dB, saturated bandwidth of 8.4 to 10.4 GHz ( $21 %$ relative bandwidth), and an efficiency of $29 %$ , in good agreement with theory.

Received 4 October 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.2746

Authors & Affiliations

V. L. Bratman¹, A. W. Cross², G. G. Denisov¹, W. He², A. D. R. Phelps², K. Ronald², S. V. Samsonov¹, C. G. Whyte², and A. R. Young²

¹Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603600, Russia
²Department of Physics and Applied Physics, University of Strathclyde, Glasgow, G4 0NG, Scotland, United Kingdom