Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier
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Joye_Demonstration-of-a-140-GHz.pdf
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Author(s)
Temkin, Richard J.
Sirigiri, Jagadishwar R.
Joye, Colin D.
Shapiro, Michael
Date Issued
April 2009
Journal
IEEE Transactions on Electron Devices
Publisher
Institute of Electrical and Electronics Engineers
Citation
Joye, C.D. et al. “Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier.” Electron Devices, IEEE Transactions on 56.5 (2009): 818-827. © 2009 IEEE
Version
Final published version
Abstract
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 [subscript 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.
Subjects
gyro-traveling-wave tube (gyro-TWT)
gyro-amplifier
Confocal
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1109/TED.2009.2015802
