CW Ka-Band Kilowatt-Level Helical-Waveguide Gyro-TWT

Самсонов, С. В.; Денисов, Г. Г.; Gachev, I. G.; Eremeev, A. G.; Fiks, A. Sh.; Kholoptsev, V. V.; Kalynova, G. I.; Мануилов, В. Н.; Mishakin, S. V.; Sokolov, É. N.

doi:10.1109/ted.2012.2196703

Cited by 27 publications

(9 citation statements)

References 20 publications

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“…In the Ka-band, pulsed power of 180 kW (pulsewidth of 3 µs) and 130 kW (pulsewidth of 100 µs) with the bandwidth of about 10% was demonstrated but (similarly to most experiments on the gyro-TWTs with high distributed losses) with a low pulse repetition frequency and, correspondingly, low average power [14], [15]. Up to this paper, the only experimentally realized CW gyro-TWT with a loss-free helical waveguide as a major part of its microwave circuit had the maximum power of 4 kW [17], [18]. Summary of all important results on the gyro-TWTs and other gyro-devices can be found in [20].…”

Section: Introductionsupporting

confidence: 59%

Ka-Band Gyrotron Traveling-Wave Tubes With the Highest Continuous-Wave and Average Power

Samsonov

Gachev

Денисов

et al. 2014

IEEE Trans. Electron Devices

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119

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The results of experimental investigation of two Ka-band gyrotron traveling-wave tube (gyro-TWT) amplifiers with helically corrugated waveguides are presented. The first tube produces pulsed output power of 130-160 kW within the frequency range of 33.1-35.5 GHz and is capable of operating with a 10% duty factor. Reliability of its major components in the high average power operation regime (about 10 kW) was proven in a continuous-wave (CW) experiment. The second gyro-TWT amplifier delivered CW power of up to 7.7 kW with −3-dB bandwidth of 2.6 GHz and −1-dB bandwidth of 2.1 GHz. Effective implementation of single-stage depressed collectors (to the best of our knowledge, for the first time for gyro-TWTs) enabled the electron efficiencies as high as 36% for the pulsed tube and 33% for the CW tube to be achieved at operation at the second cyclotron harmonic.

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Section: Introductionsupporting

confidence: 59%

Ka-Band Gyrotron Traveling-Wave Tubes With the Highest Continuous-Wave and Average Power

Samsonov

Gachev

Денисов

et al. 2014

IEEE Trans. Electron Devices

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119

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“…In another development, there has been a growing interest in millimeter wave gyro-TWTs [18][19][20][21][22][23][24][25][26][27][28][29][30][31], ranging from the Ku-band [29], Ka-band [19,[21][22][23]28], Q-band [24,26], W-band [18,20,25,30,31] to as high as 250 GHz [27]. These activities will also be highlighted along with a W band gyro-TWT's role in a state-of-the-art space radar [32].…”

Section: Gyro-twt Amplifiers and A Radar Applicationmentioning

confidence: 99%

Some recent progresses on electron cyclotron maser research

Chu

2015

2015 IEEE International Vacuum Electronics Conference (IVEC)

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Over a span of five decades, the electron cyclotron maser (ECM) has undergone a remarkably successful evolution from basic research to a poweiful millimeter, sub-millimeter, and THz wave generator called the gyrotron, while continuously being enriched by major advances. Below we discuss the ECM principle and its significance, followed by an overview of recent progresses made in two specific areas: THz gyrotron oscillators and millimeter-wave gyro-TWT ampltfiers. Topics �f the talk will include selected examples of device performances, ongoing/potential applications, and relevant physics issues.Each class of vacuum electronic devices is distinguishable by its characteristic bunching mechanism to convert an electron current from DC to AC. The ECM interaction [1][2][3][4] features a simple relativistic bunching mechanism. As shown in Fig. 1, in an applied DC magnetic field (Ba) andin the presence of a perpendicular RF electric field, the relativistic cyclotron frequency (Qc) decreases (increases) for energy-gaining (losing) electrons, which results in electron bunching along the cyclotron orbit. The ECM interaction takes place in a smooth fast-wave structure, as well as allowing the resonant excitation of a very high order mode (Fig. 2). It can thus generate output powers orders of magnitude greater than previously achievable. gain energy, eB � Q c = � azimuthal / bunching .

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“…HCIRs have been used in many gyro-amplifiers and gyrooscillators, from X-band [18], [19], Ka-band [20], [21], to W-band [1], [22]- [24]. As the output frequency of the device increases, the geometrical size of the helical corrugation correspondingly decreases and manufacturing becomes increasingly difficult.…”

Section: Introductionmentioning

confidence: 99%

CNC Machined Helically Corrugated Interaction Region for a THz Gyrotron Traveling Wave Amplifier

Donaldson

Zhang

Beardsley

et al. 2018

IEEE Trans. THz Sci. Technol.

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This paper reports the development of a helically corrugated interaction region (HCIR) for a 100 W gyrotron traveling wave amplifier operating at a central frequency of 0.37 THz. This HCIR has a corrugation amplitude of 42 µm, with a nominal waveguide diameter of 0.760 mm. The HCIR was made by electroforming copper on a sacrificial aluminium mandrel: the latter was precision CNC milled using a 0.2 mm diameter ball nose cutter. The dispersion characteristics of the HCIR were measured and found to be in good agreement with the analytical calculation and numerical simulation. Measured insertion loss was between 2 dB and 4 dB.

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CW Ka-Band Kilowatt-Level Helical-Waveguide Gyro-TWT

Cited by 27 publications

References 20 publications

Ka-Band Gyrotron Traveling-Wave Tubes With the Highest Continuous-Wave and Average Power

Ka-Band Gyrotron Traveling-Wave Tubes With the Highest Continuous-Wave and Average Power

Some recent progresses on electron cyclotron maser research

CNC Machined Helically Corrugated Interaction Region for a THz Gyrotron Traveling Wave Amplifier

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