Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier

The theory, design, and experimental results of a wideband 140-GHz 1-kW pulsed gyro-traveling-wave amplifier (gyro-TWA) are presented. The gyro-TWA operates in the HE 06 mode of an overmoded quasi-optical waveguide using a gyrating electron beam. The electromagnetic theory, interaction theory, desig...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2009-05, Vol.56 (5), p.818-827
Main Authors: Joye, C.D., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J.
Format: Article
Language:English
Subjects:
Confocal
Electromagnetic waveguides
Electromagnetics
Electron beams
Equations
gyro-amplifier
gyro-traveling-wave tube (gyro-TWT)
Mathematical model
Mirrors
Oscillators
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Summary:The theory, design, and experimental results of a wideband 140-GHz 1-kW pulsed gyro-traveling-wave amplifier (gyro-TWA) are presented. The gyro-TWA operates in the HE 06 mode of an overmoded quasi-optical waveguide using a gyrating electron beam. The electromagnetic theory, interaction theory, design processes, and experimental procedures are described in detail. At 37.7 kV and a 2.7-A beam current, the experiment has produced over 820 W of peak power with a -3-dB bandwidth of 0.8 GHz and a linear gain of 34 dB at 34.7 kV. In addition, the amplifier produced a -3-dB bandwidth of over 1.5 GHz (1.1%) with a peak power of 570 W from a 38.5-kV 2.5-A electron beam. The electron beam is estimated to have a pitch factor of 0.55-0.6, a radius of 1.9 mm, and a calculated perpendicular momentum spread of approximately 9%. The gyro-amplifier was nominally operated at a pulselength of 2 mus but was tested to amplify pulses as short as 4 ns with no noticeable pulse broadening. Internal reflections in the amplifier were identified using these short pulses by time-domain reflectometry. The demonstrated performance of this amplifier shows that it can be applied to dynamic nuclear polarization and electron paramagnetic resonance spectroscopy.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2009.2015802