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Microwave devices with helically corrugated waveguides

Bratman, V.L. and Cross, Adrian and Denisov, G.G. and Phelps, Alan and Samsonov, S.V. (2005) Microwave devices with helically corrugated waveguides. In: Quasi-optical control of intense microwave transmission. NATO science series, series II: mathematics, physics and chemistry . Springer, Dordrecht, pp. 105-114. ISBN 9781402036361

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Abstract

Helical corrugation of the inner surface of an oversized circular waveguide provides very flexible dispersion characteristic of an eigenwave. Under certain corrugation parameters, the eigenwave can possess a sufficiently high and almost constant group velocity over a wide frequency band in the region of close-to-zero axial wavenumber. This makes it attractive for broadband gyro-TWTs and gyro-BWOs with reduced sensitivity to electron velocity spread. Another set of parameters ensures an operating wave with a strong frequency dependant group velocity over a frequency band, which is sufficiently separated from any cutoffs. Such wave dispersion is favourable for frequency-chirped pulse compression at very high power levels. An overview of experiments on the helical-waveguide gyro-devices and the pulse compressor is presented.