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Title: Phase Measurements of a 140-GHz Confocal Gyro-Amplifier

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 deg/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.

Authors:
; ; ; ;
Publication Date:
DOE Contract Number:  
FC02-93ER54186
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1886668
DOI:
https://doi.org/10.7910/DVN/LPDGLP

Citation Formats

Rosenzweig, Guy, Jawla, Sudheer K., Picard, Julian F., Shapiro, Michael A., and Temkin, Richard J. Phase Measurements of a 140-GHz Confocal Gyro-Amplifier. United States: N. p., 2021. Web. doi:10.7910/DVN/LPDGLP.
Rosenzweig, Guy, Jawla, Sudheer K., Picard, Julian F., Shapiro, Michael A., & Temkin, Richard J. Phase Measurements of a 140-GHz Confocal Gyro-Amplifier. United States. doi:https://doi.org/10.7910/DVN/LPDGLP
Rosenzweig, Guy, Jawla, Sudheer K., Picard, Julian F., Shapiro, Michael A., and Temkin, Richard J. 2021. "Phase Measurements of a 140-GHz Confocal Gyro-Amplifier". United States. doi:https://doi.org/10.7910/DVN/LPDGLP. https://www.osti.gov/servlets/purl/1886668. Pub date:Fri Jun 25 00:00:00 EDT 2021
@article{osti_1886668,
title = {Phase Measurements of a 140-GHz Confocal Gyro-Amplifier},
author = {Rosenzweig, Guy and Jawla, Sudheer K. and Picard, Julian F. and Shapiro, Michael A. and Temkin, Richard J.},
abstractNote = {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 deg/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.},
doi = {10.7910/DVN/LPDGLP},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2021},
month = {6}
}

Works referencing / citing this record:

Phase Measurements of a 140-GHz Confocal Gyro-Amplifier
journal, October 2020