Compact reversed Cherenkov radiation oscillator with high efficiency

Lyu, Zhifang; Luo, Hengyu; Wang, Xin; Jiang, Shengkun; Jin, Dayong; Gong, Yubin; Chen, Min; Duan, Zhaoyun

doi:10.1063/5.0078211

Cited by 19 publications

(2 citation statements)

References 35 publications

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“…CESRR-LOADED RESONANT CAVITY studied theoretically and experimentally [20], [23], [24]. From the previous work, we understood that all-metal CeSRRs provide the negative real part of an effective permittivity in a specific frequency range.…”

Section: Table I the Size Parameters Of A Cesrr Unit Cell And Amentioning

confidence: 83%

“…This is based on the two facts: (1) the subwavelength properties of CeSRRs contribute to device miniaturization; (2) the strongly resonant behaviors due to the internal effective capacitance and inductance of CeSRRs [13] result in the enhancement of the electric fields in the localized interaction region [14] and is beneficial to the high power and high efficiency of the device. There have been a number of experimental demonstrations of metamaterial-inspired high power microwave devices, such as research groups of Temkin et al [11], [15], [16], Schamiloglu et al [17], [18], Shiffler et al [19], and Duan et al [9], [20] obtained MW-or kW-level output power in L-, S-, C-, and X-bands.…”

mentioning

confidence: 99%

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Experimental Demonstration of Compact S-Band MW-Level Metamaterial-Inspired Klystron

Wang

Zhang

Zou³

et al. 2023

IEEE Electron Device Lett.

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Metamaterials are artificially constructed subwavelength structures exhibiting unprecedented electromagnetic phenomena. In this letter, an S-band MW-level metamaterial-inspired klystron using all-metal complementary electric split ring resonators (CeSRRs) was realized in the experiment. The CeSRR-loaded interaction structure of the klystron developed here features a miniaturized structure, the volume of which is only about 0.44 of the conventional counterparts. The metamaterial-inspired klystron based on the interaction structure loaded with CeSRRs was designed, fabricated and assembled. Using a pencil beam with parameters of 120 kV/80 A in the hot-test, the klystron delivered the biggest output power of 5.51 MW with gain of 55.6 dB and electronic efficiency of 57.4% at 2.852 GHz. This compact metamaterial-inspired klystron has potential applications in proton therapy facilities, tokamaks for the low-hybrid wave heating, and accelerators.

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Section: Table I the Size Parameters Of A Cesrr Unit Cell And Amentioning

confidence: 83%

mentioning

confidence: 99%

Experimental Demonstration of Compact S-Band MW-Level Metamaterial-Inspired Klystron

Wang

Zhang

Zou³

et al. 2023

IEEE Electron Device Lett.

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Mid-infrared analogue polaritonic reversed Cherenkov radiation in natural anisotropic crystals

Guo

Zhang

et al. 2023

Nat Commun

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Cherenkov radiation (CR) excited by fast charges can serve as on-chip light sources with a nanoscale footprint and broad frequency range. The reversed CR, which usually occurs in media with the negative refractive index or negative group-velocity dispersion, is highly desired because it can effectively separate the radiated light from fast charges thanks to the obtuse radiation angle. However, reversed CR at the mid-infrared remains challenging due to the significant loss of conventional artificial structures. Here we observe mid-infrared analogue polaritonic reversed CR in a natural van der Waals (vdW) material (i.e., α-MoO3), whose hyperbolic phonon polaritons exhibit negative group velocity. Further, the real-space image results of analogue polaritonic reversed CR indicate that the radiation distributions and angles are closely related to the in-plane isofrequency contours of α-MoO3, which can be further tuned in the heterostructures based on α-MoO3. This work demonstrates that natural vdW heterostructures can be used as a promising platform of reversed CR to design on-chip mid-infrared nano-light sources.

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Reversed Cherenkov radiation amplifier with compact structure and high efficiency

Wang,

Li,

Lyu

et al. 2023

Physics of Plasmas

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Based on the reversed Cherenkov radiation excited in metamaterials, a novel S-band reversed Cherenkov radiation amplifier (RCRA) with two output ports is proposed in this paper. Its metamaterial slow-wave structure (MSWS) consists of a hollow circular waveguide periodically loaded with all-metal double-ridge complementary electric split-ring resonators (CeSRRs). The CeSRR exhibits subwavelength and strong resonance characteristics, which lead to miniaturization and high interaction impedance of the MSWS. The period of the MSWS is optimized using the phase velocity jump technique to further increase the output power and electronic efficiency. The simulation results demonstrate that when the microwave signal of 7.8 W at 2.286 GHz is inputted at port 2, the output power at port 1 is 307 W, and the saturated output power and saturated gain at port 3 are 5.48 kW and 28.47 dB, respectively. Notably, the total electronic efficiency of the RCRA is predicted as 33.84%. The RCRA features high electronic efficiency and miniaturization and may meet special application scenarios that require two output microwave signals at the same frequency.

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Compact reversed Cherenkov radiation oscillator with high efficiency

Cited by 19 publications

References 35 publications

Experimental Demonstration of Compact S-Band MW-Level Metamaterial-Inspired Klystron

Experimental Demonstration of Compact S-Band MW-Level Metamaterial-Inspired Klystron

Mid-infrared analogue polaritonic reversed Cherenkov radiation in natural anisotropic crystals

Reversed Cherenkov radiation amplifier with compact structure and high efficiency

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