An X-band overmoded relativistic klystron

Xiao, Renzhen; Chen, Changhua; Deng, Yuqun; Li, Jiawei; Bai, Xianchen

doi:10.1063/1.4901032

Cited by 10 publications

(1 citation statement)

References 24 publications

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“…In general, TEM mode energy coupling between different beam-wave interaction cavities in TKA devices has adverse effects on the stable operation state of the devices [13,[23][24][25]. However, a detailed analysis of the causes of the TEM mode in TKA devices shows that the TEM mode in the drift tube is derived from the operation mode (TM01 mode) of the bunching cavities, which gradually transforms into TEM mode for propagation at the discontinuous structure between the cavities and the drift tube.…”

Section: Utilizing Tem Mode Energy Couplingmentioning

confidence: 99%

Modular Integration of a Compact Ku-Band Relativistic Triaxial Klystron Amplifier Packaged With Permanent Magnets for High-Power Microwave Generation

Zhou

Zhang

et al. 2022

IEEE J. Electron Devices Soc.

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To achieve modular integration of relativistic triaxial klystron amplifier (TKA) devices and reduce the energy consumption of the whole high-power microwave (HPM) system, a compact Ku-band TKA packaged with permanent magnets is proposed and investigated in this paper. By optimizing the electromagnetic structure and utilizing TEM mode energy coupling, the length of the uniform magnetic field area required for the Ku-band TKA is reduced from 32 cm to 19.6 cm, with a reduction rate of 39%. By utilizing the NdFeB-N50M mainly magnetized in the R direction, a permanent magnet guiding system weighing 90 kg is proposed. Besides, the length of the uniform zone is 20 cm with a longitudinal magnetic field of 0.5 T. Verified by the PIC simulation software CHPIC, an HPM with power of 430 MW and frequency of 14.25 GHz is generated when the diode voltage, current, and the injected microwave power are 340 kV, 4.2 kA, and 15 kW, respectively. The phase jitter of the output microwave is controlled within ±5°, which is beneficial to the coherent power combination of modular integrated TKA devices.

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Section: Utilizing Tem Mode Energy Couplingmentioning

confidence: 99%

Modular Integration of a Compact Ku-Band Relativistic Triaxial Klystron Amplifier Packaged With Permanent Magnets for High-Power Microwave Generation

Zhou

Zhang

et al. 2022

IEEE J. Electron Devices Soc.

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A high efficiency Ku-band radial line relativistic klystron amplifier

Dang¹,

Zhang²,

Zhong³

et al. 2016

Physics of Plasmas

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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.

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Electron motion analysis of a radial-radiated electron beam in a radial-line drift tube with finite magnetic field conducted

2017

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Radial-radiated electron beam is widely employed in radial-line structure microwave devices. The quality of the electron beam has a crucial effect on the operating performance of these devices. This paper analyzes theoretically this electron motion in a radial-line drift tube with finite magnetic field conducted. The beam width, spatial period, and fluctuation amplitude are quantitatively analyzed with different beam current parameters. By the particle-in-cell simulation, we examine the theoretical analysis under the condition of a designed realistic coil configuration. It indicates that the derived beam envelope function is capable of predicting the radial-radiated beam trajectory approximately. Meanwhile, it is found that the off-axial z-direction magnetic field, in spite of its greatly slight amplitude, is also one necessary consideration for the propagation characteristic of the radial-radiated electron beam. Furthermore, the presented electron motion analysis may be instructive for the design of the electronic optical system of the radial-line structure microwave devices.

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An X-band overmoded relativistic klystron

Cited by 10 publications

References 24 publications

Modular Integration of a Compact Ku-Band Relativistic Triaxial Klystron Amplifier Packaged With Permanent Magnets for High-Power Microwave Generation

Modular Integration of a Compact Ku-Band Relativistic Triaxial Klystron Amplifier Packaged With Permanent Magnets for High-Power Microwave Generation

A high efficiency Ku-band radial line relativistic klystron amplifier

Electron motion analysis of a radial-radiated electron beam in a radial-line drift tube with finite magnetic field conducted

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