Combined Resonances in Cyclotron Masers With Periodic Slow-Wave Structures

Nusinovich, Gregory S.; Zhao, Ding

doi:10.1109/tps.2015.2396354

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…(2) has been published by Nusinovich and Zhao [28]. In studies of such BWOs, the anomalous Doppler resonance can lead to enhanced efficiency and output power.…”

Section: Prl 117 237701 (2016) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

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Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide

Hummelt

et al. 2016

Phys. Rev. Lett.

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An electron beam passing through a metamaterial structure is predicted to generate reversed Cherenkov radiation, an unusual and potentially very useful property. We present an experimental test of this phenomenon using an intense electron beam passing through a metamaterial loaded waveguide. Power levels of up to 5 MW are observed in backward wave modes at a frequency of 2.40 GHz using a one microsecond pulsed electron beam of 490 keV, 84 A in a 400 G magnetic field. Contrary to expectations, the output power is not generated in the Cherenkov mode. Instead, the presence of the magnetic field, which is required to transport the electron beam, induces a Cherenkov-cyclotron (or anomalous Doppler) instability at a frequency equal to the Cherenkov frequency minus the cyclotron frequency. Nonlinear simulations indicate that the Cherenkov-cyclotron mode should dominate over the Cherenkov instability at a lower magnetic field where the highest output power is obtained. DOI: 10.1103/PhysRevLett.117.237701 An electron beam interacting with a metamaterial (MTM) structure generates Cherenkov radiation in the backward direction, which is the reverse of the forward traveling Cherenkov radiation generated in conventional media [1][2][3][4]. This property is of great fundamental interest, but it may also prove to be of value in applications such as detectors in particle physics [5] or in microwave generation [6][7][8][9][10][11][12][13]. There have been very few experiments on the generation of reversed Cherenkov radiation. One experimental observation was carried out using electron bunches from an accelerator passing through a metamaterial waveguide, producing emission in the left-handed frequency band of the MTM at 10 GHz [14]. A second experiment used a phased electromagnetic dipole array to simulate a moving charged particle beam, producing reversed Cherenkov radiation in the 8.1 to 9.5 GHz range [15]. These previous experiments, however, have not investigated the interaction of a continuous electron beam with a metamaterial structure, which is of great interest for sources of microwave generation. Our experiments show that when a magnetic field is used to transport the electron beam, the reverse Cherenkov instability is not the dominant effect observed. Instead, the Cherenkov-cyclotron instability dominates over the Cherenkov instability. This result has significant implications for any practical application of metamaterials in microwave generation.High power microwave (HPM) sources are widely used in radar, defense, accelerator, and industrial applications; many examples are given in Refs. [16][17][18]. Modern particle in cell (PIC) codes have been developed that allow the design of HPM devices with full 3D treatment of both the electron beam and the electromagnetic wave [19,20]. Another important development are the advances in electromagnetics, including extensive research on novel photonic and metamaterial structures. These structures open up new possibilities for the design of HPM devices.Metamaterials are artifici...

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“…(2) has been published by Nusinovich and Zhao [28]. In studies of such BWOs, the anomalous Doppler resonance can lead to enhanced efficiency and output power.…”

Section: Prl 117 237701 (2016) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

“…In studies of such BWOs, the anomalous Doppler resonance can lead to enhanced efficiency and output power. Competition can also occur between resonances of different values of n when the resultant frequencies (ω) are nearly identical [28].…”

Section: Prl 117 237701 (2016) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide

Hummelt

et al. 2016

Phys. Rev. Lett.

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“…Initial conditions for the system of Equations (15) in the electron beam initial modulation absence can be defined in the following form:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Previously proposed traveling wave gyroton [4] is based on the anomalous Doppler effect [6,15]. The calculated TM 11 wave phase velocity is less than the longitudinal velocity of electrons, and the following equation is satisfied…”

Section: Introductionmentioning

confidence: 99%

Gyroton with the Corrugated Resonator

Kolosov

Kurayev

Рак

et al. 2019

Plasma

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A new type of high-power electronic device—a gyroton with a corrugated resonator—is described and investigated. Spatial bunching of the electron beam does not occur in this device, however, highly efficient electron beam power conversion into the rotating electromagnetic field power is possible. The rectilinear electron beam deviates from the axis by the slow TM11 wave, then it gives up longitudinal energy to the same wave with more than 78% efficiency, and an output power up to 30 MW. The developed mathematical model of the interaction of the relativistic electron beam with an irregular circular waveguide and resonator fields presented in this article can be used to calculate and optimize the processes occurring in various microwave electronic devices, such as gyrotrons, gyrotons, TWT, Gyro-TWT, and BWT.

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“…This is a unique advantage of the periodic SWS (there is no the characteristic in the uniform medium). References [10][11][12] ever discussed the effect of the resonance enhancement on backward-wave oscillators, gain, bandwidth and efficiency. Especially in [10], using the corrugated circular waveguide structure, it is found that the cyclotron resonance has a significant enhancement effect on the Cherenkov resonance effect, which may improve gain and bandwidth of the traveling wave tube.…”

Section: Introductionmentioning

confidence: 99%

Effect of cyclotron resonance on ‘hot’ dispersion in a staggered double metallic grating sheet beam travelling wave tube

Wang

Fan

Chen

et al. 2019

Plasma Sci. Technol.

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Based on the beam wave synchronous interaction in transverse and longitudinal directions at the same time and starting from Maxwell's equation and linear Vlasov equation, the beam-wave interaction 'hot' dispersion equation considering both cyclotron resonance and Cherenkov resonance in a staggered double metallic grating traveling wave tube is deduced. Through the reasonable selection for geometric and electrical parameters, the numerical calculation and analysis of the 'hot' dispersion equation shows that the beam-wave interaction gain and frequency band with the cyclotron resonance enhancement effect are higher than those with only Cherenkov resonance radiation.

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Combined Resonances in Cyclotron Masers With Periodic Slow-Wave Structures

Cited by 15 publications

References 25 publications

Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide

Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide

Gyroton with the Corrugated Resonator

Effect of cyclotron resonance on ‘hot’ dispersion in a staggered double metallic grating sheet beam travelling wave tube

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