Analysis of Phase Characteristics of Gyrotron Traveling-Wave Tubes

Liu, Ying; Yan, Ran; Yao, Yelei; Yue, Qingquan; Lin, Xin; Li, Wenxi; Luo, Yong

doi:10.1109/ted.2020.2981165

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…This feature makes it possible to apply in the terahertz band [15][16][17]. Based on the high loss DL circuit, at the University of Electronic Science and Technology of China (UESTC), a series of gyro-TWAs covering X, Ku, Ka, Q, and W bands has been successfully developed [5,14,[18][19][20][21][22]. In order to suppress the backward wave TE 11 and TE 21 mode oscillations and TE 01 mode oscillation at the cutoff frequency in the gyro-TWA, a high loss DL circuit made from BeO-SiC ceramic was adopted.…”

Section: Introductionmentioning

confidence: 99%

Theory, Simulation and Millimeterwave Measurement of the Operating and Parasitic Modes in a High Loss Dielectric Loaded Gyrotron Traveling Wave Amplifier (Invited)

Wang¹,

Jiang²,

Yao³

et al. 2021

PIER C

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In the gyrotron traveling wave amplifier (gyro-TWA), high loss dielectric materials loaded in a cylindrical waveguide are adopted to suppress the unwanted parasitic oscillations. It is of great importance to accurately understand the relative permittivity r and tan δ for studying the microwave and millimeter wave dispersion, and loss properties of a specific mode. The high lossy dielectric loaded circuits of the gyro-TWAs made of the BeO-SiC ceramic are theoretical calculated, simulated, and measured. The field distribution, dispersion, and loss properties of three different dielectric loaded circular HE d 12 , HE d 22 , and TE d 02 modes (corresponding to the TE 11 , TE 21 , and TE 01 modes in the smooth hollow cylindrical waveguide respectively) in different frequency bands are respectively investigated. The theoretical analysis, simulation, and measurement results have a good agreement. This work has clear guiding significance for the stable work of gyro-TWAs.

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Section: Introductionmentioning

confidence: 99%

Theory, Simulation and Millimeterwave Measurement of the Operating and Parasitic Modes in a High Loss Dielectric Loaded Gyrotron Traveling Wave Amplifier (Invited)

Wang¹,

Jiang²,

Yao³

et al. 2021

PIER C

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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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