Toward 80% Efficiency in a Super Klystron-Like Relativistic Backward Wave Oscillator With Second and Third Harmonic Coaxial-Premodulation Cavity

Xiao, Renzhen; Chen, Kun; Shi, Yanchao; Chen, Changhua

doi:10.1109/ted.2023.3253805

Cited by 10 publications

(1 citation statement)

References 33 publications

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“…In 21st century studies of properties of materials and their surfaces, biomolecules, crystalline structures, micro-and nano-objects often employs high-power sources of X-ray radiation, such as synchrotrons and free electron lasers (FELs) . Most radiation sources exploit a single pass of radiation in an FEL amplifier; although, proposals for Klystron-like devices with oscillators exist [34]. These facilities operate in a wide range of frequencies from visible to hard X-rays.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Increased Electron Energy Spread on the Radiation of the Second Harmonic in Free Electron Lasers

Zhukovsky

2023

Symmetry

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Free electron lasers (FELs) are becoming more and more popular as sources of radiation for research purposes in many fields of science. They are frequently employed in second harmonic generation (SHG) studies. SHG is an important effect of nonlinear responses of matter to irradiation. It should be separated from the second harmonic of the radiation source, FELs, for correct analysis of the response. Using an analytical model for harmonic powers evolution in a single-pass FEL, we demonstrate the dependence of FEL harmonics on the key parameters of beams and undulators and show that it is possible to reduce the second FEL harmonic content if the energy spread of an electron beam is increased. For LEUTL FEL radiation in the visible range, we analytically demonstrate a reduction in the second harmonic power by an order of magnitude if electron energy spread is increased twice, which still allows efficient bunching at the fundamental wavelength. The method is valid regardless of the photon energy and, therefore, the absorption edge of the target material, and as such, it is valid also in the X-ray band.

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Section: Introductionmentioning

confidence: 99%

The Influence of Increased Electron Energy Spread on the Radiation of the Second Harmonic in Free Electron Lasers

Zhukovsky

2023

Symmetry

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Recent development of RF-to-dc rectifying technologies for wireless power transfer

Zhang,

Zhao,

Wang

2024

Space Solar Power and Wireless Transmission

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Design of a cross-band frequency hopping high power microwave oscillator with permanent magnet package

Zhou,

Zhang,

Zhang

et al. 2023

Physics of Plasmas

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A cross-band frequency hopping high power microwave (HPM) oscillator with permanent magnet package was proposed. The oscillator comprises of an inner Ku-band hollow oscillator and an outer C-band coaxial oscillator. By comparing with other cross-band HPM oscillators, this device is quite compact and high efficiency, for the guiding magnetic field is as low as 0.43 T, which is provided by a 74 kg permanent magnet. Since the cathode can be adjusted telescopically to produce annular electron beams at different radius, different bands HPMs can be generated in the inner and the outer slow wave structure. Verified by particle-in-cell simulation, a HPM with a frequency of 7.8 GHz and a power of 3.1 GW is achieved for C-band, corresponding to a power efficiency of 45%. Respectively, a Ku-band HPM output with a frequency of 14.4 GHz and a power of 1.3 GW were obtained, corresponding to a power efficiency of 45%.

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Toward 80% Efficiency in a Super Klystron-Like Relativistic Backward Wave Oscillator With Second and Third Harmonic Coaxial-Premodulation Cavity

Cited by 10 publications

References 33 publications

The Influence of Increased Electron Energy Spread on the Radiation of the Second Harmonic in Free Electron Lasers

The Influence of Increased Electron Energy Spread on the Radiation of the Second Harmonic in Free Electron Lasers

Recent development of RF-to-dc rectifying technologies for wireless power transfer

Design of a cross-band frequency hopping high power microwave oscillator with permanent magnet package

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