Phase Measurements of a 140-GHz Confocal Gyro-Amplifier
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 stabl...
| Main Authors: | , , , , |
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| Format: | Article |
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Springer Science and Business Media LLC
2020
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| Online Access: | https://hdl.handle.net/1721.1/128268 |
| _version_ | 1811085670103384064 |
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| author | Rosenzweig, Guy Jawla, Sudheer K. Picard, Julian F. Shapiro, Michael Temkin, Richard J |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center Rosenzweig, Guy Jawla, Sudheer K. Picard, Julian F. Shapiro, Michael Temkin, Richard J |
| author_sort | Rosenzweig, Guy |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T13:13:25Z |
| format | Article |
| id | mit-1721.1/128268 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:13:25Z |
| publishDate | 2020 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1282682022-09-28T12:46:02Z Phase Measurements of a 140-GHz Confocal Gyro-Amplifier Rosenzweig, Guy Jawla, Sudheer K. Picard, Julian F. Shapiro, Michael Temkin, Richard J Massachusetts Institute of Technology. Plasma Science and Fusion Center Massachusetts Institute of Technology. Department of Physics 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. NIH and NIBIB (Grants R01-EB004866 and R01-EB001965) DOE (Grant DE-FC02-93ER54186) 2020-10-30T14:52:20Z 2020-10-30T14:52:20Z 2020-10 2020-07 Article http://purl.org/eprint/type/JournalArticle 1866-6892 1866-6906 https://hdl.handle.net/1721.1/128268 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 http://dx.doi.org/10.1007/s10762-020-00751-w Journal of Infrared, Millimeter, and Terahertz Waves 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. application/pdf Springer Science and Business Media LLC Temkin |
| spellingShingle | Rosenzweig, Guy Jawla, Sudheer K. Picard, Julian F. Shapiro, Michael Temkin, Richard J Phase Measurements of a 140-GHz Confocal Gyro-Amplifier |
| title | Phase Measurements of a 140-GHz Confocal Gyro-Amplifier |
| title_full | Phase Measurements of a 140-GHz Confocal Gyro-Amplifier |
| title_fullStr | Phase Measurements of a 140-GHz Confocal Gyro-Amplifier |
| title_full_unstemmed | Phase Measurements of a 140-GHz Confocal Gyro-Amplifier |
| title_short | Phase Measurements of a 140-GHz Confocal Gyro-Amplifier |
| title_sort | phase measurements of a 140 ghz confocal gyro amplifier |
| url | https://hdl.handle.net/1721.1/128268 |
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