Title :
Ka-Band Gyrotron Traveling-Wave Tubes With the Highest Continuous-Wave and Average Power
Author :
Samsonov, S.V. ; Gachev, I.G. ; Denisov, G.G. ; Bogdashov, A.A. ; Mishakin, S.V. ; Fiks, A.S. ; Soluyanova, E.A. ; Tai, E.M. ; Dominyuk, Y.V. ; Levitan, B.A. ; Murzin, V.N.
Author_Institution :
Inst. of Appl. Phys., Nizhny Novgorod, Russia
Abstract :
The results of experimental investigation of two Ka-band gyrotron traveling-wave tube (gyro-TWT) amplifiers 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 (to the best of our knowledge, 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.
Keywords :
cyclotrons; gyrotrons; millimetre wave amplifiers; travelling wave tubes; Ka-band gyrotron traveling wave tubes; average power; bandwidth 2.1 GHz; bandwidth 2.6 GHz; continuous-wave experiment; electron efficiency; frequency 33.1 GHz to 35.5 GHz; gyro-TWT amplifier; helically corrugated waveguides; power 130 kW to 160 kW; pulsed tube; second cyclotron harmonic; single-stage depressed collectors; Bandwidth; Cathodes; Electron tubes; Frequency measurement; Gyrotrons; Power generation; Traveling-wave tubes; Gyro-amplifiers; gyrotron traveling-wave tube (gyro-TWT); high-power amplifiers; high-power amplifiers.;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2014.2364623
