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Gyrotron traveling wave amplifier with a helical interaction waveguide

Denisov, G G and Bratman, V L and Cross, A W and He, W and Phelps, A D R and Ronald, K and Samsonov, S V and Whyte, C G (1998) Gyrotron traveling wave amplifier with a helical interaction waveguide. Physical Review Letters, 81 (25). pp. 5680-5683. ISSN 0031-9007

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Abstract

A new microwave system in the form of a cylindrical waveguide with a helical corrugation of the inner surface is proposed for a gyrotron traveling wave tube (gyro-TWT). The corrugation radically changes the wave dispersion in the region of small axial wave numbers. This allows significant reduction in the sensitivity of the amplifier to the electron velocity spread and an increase in its frequency bandwidth. An X-band gyro-TWT operating at the second cyclotron harmonic with a 200-keV, 25-A electron beam produced an output power of 1 MW, corresponding to a gain of 23 dB and an efficiency of 20%.