High-Power 140-GHz Quasioptical Gyrotron Traveling-Wave Amplifier
- 26 June 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 90 (25), 258302
- https://doi.org/10.1103/physrevlett.90.258302
Abstract
We present the design and experimental results of a novel quasioptical gyrotron traveling-wave tube (gyro-TWT) amplifier at 140 GHz. The gyro-TWT produced up to 30 kW of peak power in pulsed operation at 6 Hz achieving a peak gain of 29 dB, a peak efficiency of 12%, and a bandwidth of 2.3 GHz. The device was operated in a very higher-order mode of an open quasioptical interaction structure, namely, a confocal waveguide. The diffraction loss from the open sidewalls of the confocal waveguide was used to suppress mode competition in this highly overmoded circuit resulting in a stable single-mode operation. The experiment achieved record high power levels at 140 GHz for a gyro-TWT. These experiments demonstrate the effectiveness of using overmoded quasioptical waveguide interaction structures for generating high power in the millimeter and submillimeter wave bands with a gyro-TWT.
Keywords
This publication has 9 references indexed in Scilit:
- A gyrotron-traveling-wave tube amplifier experiment with a ceramic loaded interaction regionIEEE Transactions on Plasma Science, 2002
- Demonstration of a 10 kW average power 94 GHz gyroklystron amplifierPhysics of Plasmas, 1999
- Ultrahigh Gain Gyrotron Traveling Wave AmplifierPhysical Review Letters, 1998
- 140-GHz gyrotron experiments based on a confocal cavityIEEE Transactions on Plasma Science, 1998
- Spectral Theory and Excitation of Open StructuresPublished by Institution of Engineering and Technology (IET) ,1996
- Theory of gyro-travelling-wave tubes at cyclotron harmonicsInternational Journal of Electronics, 1992
- Linear and non-linear theory of the Doppler-shifted cyclotron resonance maser based on TE and TM waveguide modesInternational Journal of Electronics, 1986
- High efficiency operation of a 140 GHz pulsed gyrotronInternational Journal of Electronics, 1984
- Invited paper. Powerful millimetre-wave gyrotronsInternational Journal of Electronics, 1981