Phase stability in gyro-traveling-wave-tubes

Nusinovich, Gregory S.; Rodgers, J.; Chen, W.; Granatstein, V. L.

doi:10.1109/16.930667

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…As to the output stage, the mode-selective circuit presented in the last section had been used successfully in gyrotron oscillators and gyro-amplifiers as input coupler, resonant cavity or traveling wave interaction structure [15,[23][24][25][26][27][28]. Excellent mode selectivity and stability of the circuit had also been demonstrated.…”

Section: Stability Analysismentioning

confidence: 99%

“…For example, in the harmonic-doubling gyro-TWA experiment reported in Ref. [15,16] and [28], such a circuit with L 2 =20 cm was used as the amplifier's output stage and could operate stably at TE 02 -TE 03 mode pair for a 50 kV, 22 A electron beam with a velocity ratio of 1.35. The peak power of 126 kW at 32.18 GHz and a 3.2% instantaneous 3 dB bandwidth had also been achieved.…”

Section: Stability Analysismentioning

confidence: 99%

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Preliminary Design of a Harmonic-doubling Gyrotron Traveling Wave Amplifier

Jiao

Luo

2007

Int J Infrared Milli Waves

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This study proposes a Ka-band harmonic-doubling gyrotron traveling-wave amplifier (gyro-TWT), using distributed wall losses in the input stage and mode-selective interaction circuit in the output stage, to improve the stability of the amplification. Based on a large signal simulation code, a saturated peak power of 163 kW with an efficiency of 15.5%, a gain of 31.1 dB, and a 3 dB bandwidth of 0.9 GHz is predicted for the gyro-TWT driven by 70 kV, 15 A electron beam with a velocity ratio of 1.2 and velocity spread 5% at 33.2 GHz.

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Section: Stability Analysismentioning

confidence: 99%

Section: Stability Analysismentioning

confidence: 99%

Preliminary Design of a Harmonic-doubling Gyrotron Traveling Wave Amplifier

Jiao

Luo

2007

Int J Infrared Milli Waves

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“…Other phase-sensitive applications include coherent radars, communication systems, accelerators, and linear colliders. The phase stability of gyro-amplifiers has been the subject of intensive theoretical and experimental research [5][6][7][8][9][10][11][12][13][14][15], but thus far it has only been measured up to W-band, for any amplifier. Existing techniques are challenging at higher frequencies because of high ohmic loss in fundamental waveguides and limited availability of crucial components, such as a balanced mixer.…”

Section: Introductionmentioning

confidence: 99%

Phase Measurements of a 140-GHz Confocal Gyro-Amplifier

Rosenzweig

Jawla

Picard

et al. 2020

J Infrared Milli Terahz Waves

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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 pulseto-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.

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“…Other gyro-TWT work is being performed at the University of California at 94 GHz [6], at the University of Maryland, College Park, at 32 GHz [7] and a 35 GHz spiral waveguide gyro-TWT has been demonstrated by a collaboration between the University of Strathclyde, Glasgow U.K., and the Institute of Applied Physics, Nizhny Novgorod Russia [8].…”

mentioning

confidence: 98%

Design and Simulation of an Ultra-Broadband Ku-BandGyro-TWT for Radar Applications

Geng

Liu

et al. 2008

Int J Infrared Milli Waves

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In this paper, the design of an ultra-broadband Ku-band gyro-TWT amplifier is presented in detail. The preliminary parameters of the interaction structure derived from the dispersion relationship and the linear theory of the gyro-TWT with distributed wall losses is optimized by the self-consistent nonlinear code. The performance of the designed gyro-TWT is simulated by the nonlinear code. The simulation results show that the gain and the bandwidth of the designed Ku-band gyro-TWT is about 36.5 dB and 2.1 GHz with 3 dB bandwidth (about 12.7%) respectively at the input power 19.0 W.

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Phase stability in gyro-traveling-wave-tubes

Cited by 12 publications

References 10 publications

Preliminary Design of a Harmonic-doubling Gyrotron Traveling Wave Amplifier

Preliminary Design of a Harmonic-doubling Gyrotron Traveling Wave Amplifier

Phase Measurements of a 140-GHz Confocal Gyro-Amplifier

Design and Simulation of an Ultra-Broadband Ku-BandGyro-TWT for Radar Applications

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