A high efficiency Ku-band radial line relativistic klystron amplifier

Journal Article · Fri Jul 15 04:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4958810· OSTI ID:22600025

Dang, Fangchao; Zhang, Xiaoping; Zhong, Huihuang; Zhang, Jun; Ju, Jinchuan ^[1]

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1. College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073 (China)

To achieve the gigawatt-level microwave amplification output at Ku-band, a radial-line relativistic klystron amplifier is proposed and investigated in this paper. Different from the annular electron beam in conventional axial relativistic klystron amplifiers, a radial-radiated electron beam is employed in this proposed klystron. Owing to its radially spreading speciality, the electron density and space charge effect are markedly weakened during the propagation in the radial line drift tube. Additionally, the power capacity, especially in the output cavity, is enhanced significantly because of its large volume, which is profitable for the long pulse operation. Particle-in-cell simulation results demonstrate that a high power microwave with the power of 3 GW and the frequency of 14.25 GHz is generated with a 500 kV, 12 kA electron beam excitation and the 30 kW radio-frequency signal injection. The power conversion efficiency is 50%, and the gain is about 50 dB. Meanwhile, there is insignificant electron beam self-excitation in the proposed structure by the adoption of two transverse electromagnetic reflectors. The relative phase difference between the injected signals and output microwaves keeps stable after the amplifier saturates.

• OSTI ID: 22600025
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 23; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLIFIERS
DRIFT TUBES
EFFICIENCY
ELECTRON BEAMS
ELECTRON DENSITY
ELECTRONS
EXCITATION
KLYSTRONS
MICROWAVE RADIATION
RADIOWAVE RADIATION
RELATIVISTIC RANGE
SIGNALS
SPACE CHARGE