Phase Measurements of a 140-GHz Confocal Gyro-Amplifier
Name
Rosenzweig JIMT 2020.pdf
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Author(s)
Rosenzweig, Guy
Jawla, Sudheer K.
Picard, Julian F.
Shapiro, Michael
Temkin, Richard J
Date Issued
October 2020
Journal
Journal of Infrared, Millimeter, and Terahertz Waves
Publisher
Springer Science and Business Media LLC
Citation
Rosenzweig, Guy et al. "Phase Measurements of a 140-GHz Confocal Gyro-Amplifier." Journal of Infrared, Millimeter, and Terahertz Waves 41 (October 2020): doi.org/10.1007/s10762-020-00751-w © 2020 Springer Science Business Media, LLC, part of Springer Nature
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Author's final manuscript
Abstract
The phase stability of a 140-GHz, 1-kW pulsed gyro-amplifier system and the phase dependence on the cathode voltage were experimentally measured. To optimize the measurement precision, the amplifier was operated at 47 kV and 1 A, where the output power was ∼30 W. The phase was determined to be stable both pulse-to-pulse and during each pulse, so far as the cathode voltage and electron beam current are constant. The phase variation with voltage was measured and found to be 130 ± 30°/kV, in excellent agreement with simulations. The electron gun used in this device is non-adiabatic, resulting in a steep slope of the beam pitch factor with respect to cathode voltage. This was discovered to be the dominant factor in the phase dependence on voltage. The use of an adiabatic electron gun is predicted to yield a significantly smaller phase sensitivity to voltage, and thus a more phase-stable performance. To our knowledge, these are the first phase measurements reported for a gyro-amplifier operating at a frequency above W-band.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/s10762-020-00751-w
