Operation of a Highly Overmoded, Harmonic-Multiplying, Wideband Gyrotron Amplifier

Guo, H.; Chen, S. H.; Granatstein, V.L.; Rodgers, J.; Nusinovich, Gregory S.; Walter, M.; Levush, B.; Chen, W. J.

doi:10.1103/physrevlett.79.515

Cited by 54 publications

(15 citation statements)

References 23 publications

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“…6 The comparisons of the linear growth rate and coupling impedance between (a) unloaded empty waveguide (nonlinear stage), and (b) lossy dielectric-lined waveguide (linear stage). weak beam-wave coupling strength in the higher order harmonic ECM system makes it difficult to realize efficient beam-wave interaction and stable operation [2,[13][14][15].…”

Section: Discussionmentioning

confidence: 99%

Beam-Wave Coupling Strength Analysis in a Gyrotron Traveling-Wave Amplifier

Du¹,

Liu²

2010

J Infrared Milli Terahz Waves

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Mode competition is an important aspect of the stability analysis of a gyrotron traveling-wave amplifier (gyro-TWT). The concept of the coupling impedance is developed in this paper to investigate the beam-wave coupling strength in the electron cyclotron maser (ECM) interaction system. The coupling impedance brings a global consideration to study competition between the absolute instability and the convective instability in the circuit. The research reveals that the coupling impedance is proportional to the phase velocity of the mode, which means the coupling impedance of a mode in the lower k z region is much stronger than the one in the higher k z region. Interesting discussions are also carried out at the end of the paper. The coupling impedance provides an additional dimension of measurement to understand the ECM interaction.

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Section: Discussionmentioning

confidence: 99%

Beam-Wave Coupling Strength Analysis in a Gyrotron Traveling-Wave Amplifier

Du¹,

Liu²

2010

J Infrared Milli Terahz Waves

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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%

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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“…In these regimes the benefits from operation at cyclotron harmonics can be combined with the advantages of using available, relatively inexpensive, low-frequency, highpower drivers for input stages of such amplifiers. In recent years such frequency-multiplying operation of various gyroamplifiers was studied at the University of Maryland both experimentally [4][5][6] and theoretically. [7][8][9][10][11] One of the most promising large-bandwidth gyroamplifiers is the gyro-traveling-wave-tube ͑gyro-TWT͒.…”

Section: Introductionmentioning

confidence: 99%

Analytical theory of frequency-multiplying gyro-traveling-wave-tubes

2001

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The theory is developed which describes analytically the gain and bandwidth in frequency-multiplying gyro-traveling-wave-tubes. In this theory the input waveguide is considered in the small-signal approximation. Then, in the drift region separating the input and output waveguides, the electron ballistic bunching evolves which causes the appearance in the electron current density of the harmonics of the signal frequency. The excitation of the output waveguide by one of these harmonics is considered in a specified current approximation. This makes the analytical study of a large-signal operation possible. The theory is illustrated by using it to analyze the performance of an existing experimental tube.

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Operation of a Highly Overmoded, Harmonic-Multiplying, Wideband Gyrotron Amplifier

Cited by 54 publications

References 23 publications

Beam-Wave Coupling Strength Analysis in a Gyrotron Traveling-Wave Amplifier

Beam-Wave Coupling Strength Analysis in a Gyrotron Traveling-Wave Amplifier

Preliminary Design of a Harmonic-doubling Gyrotron Traveling Wave Amplifier

Analytical theory of frequency-multiplying gyro-traveling-wave-tubes

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