High-power harmonic gyro-TWT's. II. Nonlinear theory and design

Wang, Q.S.; Kou, C. S.; McDermott, D.B.; Lin, A. T.; Chu, K. R.; Luhmann, Neville C.

doi:10.1109/27.142816

Cited by 63 publications

(25 citation statements)

References 25 publications

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“…In this section, a large signal simulation code developed according to the theory presented in the references [9,29] is used to study the large signal characteristics of the frequencydoubling gyro-TWT with the following parameters: 70 kV,15 A, á=1.2, L 1 =10 cm, ρ= 145000ρ cu , and B 0 =0.631 T. The calculated saturated power, efficiency and gain are shown in Figs. 4 and 5 respectively.…”

Section: Large Signal Simulationsmentioning

confidence: 99%

“…The amplifier design was developed by following the marginal stability design procedure [9,20]. The guiding center radius of the electron beam is 4.5 mm, where the beam-wave coupling coefficient is at its peak for the operating mode in the output stage.…”

Section: Stability Analysismentioning

confidence: 99%

“…harmonic at all stages [5,9]. The harmonic multiplying operation is of practical interest because of the reduced magnetic-field requirement and the ready availability of lowfrequency drivers for a gyrotron traveling wave amplifier.…”

mentioning

confidence: 99%

See 2 more Smart Citations

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: Large Signal Simulationsmentioning

confidence: 99%

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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“…Moreover, at high harmonics severe mode competition occurs [12,19,22]. Thus, it appears that the successful operation of a highharmonic gyro-TWT with low magnetic field requirement that can be operated with low-energy electron beams and with means for harmonic selection calls for some fundamental modification of the conventional smooth-wall waveguide configuration.…”

Section: Motivationmentioning

confidence: 99%

Modal Analysis of Azimuthally Periodic Vane-Loaded Cylindrical Waveguide Interaction Structure for Gyro-TWT

Singh¹,

Basu²

2007

PIER

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Abstract-This article discusses the gain-frequency characteristics of most competing modes of azimuthally periodic vane-loaded cylindrical waveguide interaction structure for gyrotron traveling wave tube (gyro-TWT) amplifier, which is the device of increasing importance because of its high-power and broad bandwidth capabilities. Vane-loading is identified as a means to achieve a low-beam energy, high-harmonic, low-magnetic field, mode-selective and stable operation of a gyro-TWT, and thus the development of a simple approach to the analysis of a vane-loaded gyro-TWT have been identified as a problem of practical relevance.

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“…CRM theory was developed in the late 1950's independently by several scientists[9, 10, 11J, with many improvements having been added since then [12] - [22]. The CRM interaction is driven by electrons traveling helically in a uniform magnetic field.…”

Section: Theorymentioning

confidence: 99%