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Your search keyword '"Xiao, Renzhen"' showing total 24 results
Start Over Author "Xiao, Renzhen" Publisher institute of electrical and electronics engineers (ieee)
24 results on '"Xiao, Renzhen"'

6. Efficiency Enhancement of a Klystron-Like Relativistic Backward Wave Oscillator With Waveguide Reflection and Bunching Promotion

Author

Yanchao Shi, Jun Sun, Changhua Chen, Fan Ruyu, Wenhua Huang, Xiao Renzhen, Huida Wang, and Zhang Guangshuai

Subjects
Physics, General Computer Science, Klystron, business.industry, Cherenkov radiation, General Engineering, relativistic backward-wave oscillator, law.invention, Optics, law, Reflection (physics), Waveguide (acoustics), High power microwaves, intense relativistic electron beams, General Materials Science, Backward-wave oscillator, lcsh:Electrical engineering. Electronics. Nuclear engineering, business, lcsh:TK1-9971
Abstract

A klystron-like relativistic backward-wave oscillator (KL-RBWO) with transverse electron beam confinement and waveguide reflection, which works well under a magnetic-field strength below that of the cyclotron resonance, is proposed. For this device operating with a low magnetic field, effective suppression of the transverse velocity of electron beams is introduced by a local electric field near the tube head, to promote modulation uniformity of electron beams. Part of the reflected microwave from the output waveguide provides feedback enhancement to the extractor, which strengthens the local standing-wave field. Owing to a stronger electric field that can interact with the electron beam in the extractor and a higher growth of fundamental harmonic current, the efficiency of the KL-RBWO is increased to 40% when guided by a magnetic field of 0.32 T, compared with that of 30% using conventional structures.

Published
2020

19. Theoretical Study of a Plasma-Filled Relativistic Cerenkov Generator With Coaxial Slow-Wave Structure

Author

Song Zhimin, Lin Yuzheng, Liu Guozhi, Chen Changhua, and Xiao Renzhen

Subjects
Physics, Nuclear and High Energy Physics, Amplitude, Quantum mechanics, Dispersion relation, Dispersion (optics), Reflection (physics), Plasma, Reflection coefficient, Coaxial, Condensed Matter Physics, Electromagnetic radiation, Computational physics
Abstract

The linear and nonlinear theory of a plasma-filled relativistic Cherenkov generator with coaxial slow-wave structure (SWS) is developed. Linear analysis includes the space-charge limiting current, dispersion relations, dispersion curves, and coupling impedance. In nonlinear theory, the electron beam space-charge effect, nonsynchronous interaction, and complex reflection coefficients of the electromagnetic wave at the boundaries of the SWS are taken into account. With the assumption of quasi steady state, the self-consistent equations are numerically calculated using the fourth-order Runge-Kutta method. The effects of the relative phase between inner and outer corrugations, phase and amplitude of the complex reflection coefficient at the boundaries of the SWS, and plasma density on device efficiency are discussed. Efficiencies of up to 37% without plasma and about 50% with plasma density of np = 3-7 times 1011 cm-3 are obtained.

Published
2007

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