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High-power broadband amplifiers based on the gyro-TWT


G.G. Denisov - Corresponding Member of RAS, Head of Department, Institute of Applied Physics (Nizhni Novgorod); Professor, Nizhegorodskii State University n.a. N.I. Lobachevskii. E-mail: A.A. Bogdashov - Ph.D. (Phys.-Math.), Senior Research Scientist, Institute of Applied Physics (Nizhni Novgorod) I.G. Gachev - Ph.D. (Phys.-Math.), Senior Research Scientist, Institute of Applied Physics (Nizhni Novgorod) S.V. Mishakin - Ph.D. (Phys.-Math.), Senior Research Scientist, Institute of Applied Physics (Nizhni Novgorod) S.V. Samsonov - Dr.Sc. (Phys.-Math.), Senior Research Scientist, Institute of Applied Physics (Nizhni Novgorod) E.V. Sokolov - Ph.D. (Phys.-Math.), Senior Research Scientist, Institute of Applied Physics (Nizhni Novgorod); Director, JSC «Gikom» E.A. Soluyanova - Ph.D. (Phys.-Math.), Head of Department, JSC «Gikom» E.M. Tai - Ph.D. (Phys.-Math.), Director, Nizhegorodskii Department of JSC «Gikom»

The results of experimental investigation of two Ka-band gyrotron traveling-wave tubes (gyro-TWTs) with helically corrugated waveguides are presented. The first tube produces pulsed output power of 130–160 kW within the frequency range of 33.1–35.5 GHz and is capable of operating with a 10% duty factor. Reliability of its major components in the high average power operation regime (about 10 kW) was proven in a continuous-wave (CW) experiment. The second gyro-TWT amplifier delivered CW power of up to 7.7 kW with −3-dB bandwidth of 2.6 GHz and −1-dB bandwidth of 2.1 GHz. Effective implementation of single-stage depressed collectors (for the first time for gyro-TWTs) enabled the electron efficiencies as high as 36% for the pulsed tube and 33% for the CW tube to be achieved at operation at the second cyclotron harmonic.


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