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

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...

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Bibliographic Details
Published in:Physical review letters 2000-03, Vol.84 (12), p.2746-2749
Main Authors: Bratman, VL, Cross, AW, Denisov, GG, He, W, Phelps, AD, Ronald, K, Samsonov, SV, Whyte, CG, Young, AR
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.84.2746