Experimental demonstration of Smith–Purcell radiation enhancement by frequency multiplication in open cavity

Bratman, V. L.; Fedotov, A. É.; Makhalov, P. B.

doi:10.1063/1.3554435

Cited by 38 publications

(6 citation statements)

References 20 publications

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“…Recently, "super-radiance" due to stimulated SP radiation has been reported 6 and enhancement of the SP radiation has been extensively studied. [7][8][9][10] The resonant interaction of beam with the surface wave is essential to the SP radiation power enhancement.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of intense radiation in terahertz region based on cylindrical surface wave resonator

Gong

Ogura

Yambe

et al. 2015

Journal of Applied Physics

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Periodical corrugations structured on a cylindrical conductor have cylindrical surface waves (CSWs), which are reflected at the corrugation ends and form a CSW-resonator. In this paper, intense radiations in terahertz region based on the CSW-resonator are reported. The CSWresonators with upper cut off frequencies in the modern IEEE G-band (110-300 GHz) are excited by a coaxially injected annular beam in a weakly relativistic region less than 100 kV. It is shown that there exists an oscillation starting energy for the CSW-resonator. Above the starting energy, very intense terahertz radiations on the order of kW are obtained. The operation frequencies in the range of 166-173 GHz and 182-200 GHz are obtained using two types of CSW-resonator with the different corrugation amplitude. Electromagnetic properties of the CSW-resonator can be controlled by the artificial structure and may play an important role in high-intensity terahertz generations and applications. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Experimental study of intense radiation in terahertz region based on cylindrical surface wave resonator

Gong

Ogura

Yambe

et al. 2015

Journal of Applied Physics

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“…In addition, the BWO can serve as the basis of a Smith-Purcell Free Electro Laser operating at higher harmonics [20]- [22].…”

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confidence: 99%

Theory of Multimode Resonant Backward-Wave Oscillator With an Inclined Electron Beam

Khutoryan

Sattorov

Lukin

et al. 2015

IEEE Trans. Electron Devices

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A multimode theory of the resonant backward-wave oscillator (BWO) with an electron beam inclined with respect to the surface of a periodic structure-a clinotron-is presented. It is shown that mode interaction provides phase velocity variation in the interaction space. The beam-wave interaction power increases at a favorable phase velocity profile along the interaction space, which manifests as power peaks in the clinotron zone. In contrast, when it is nonfavorable, there is power drop in the bandwidth. Developed multimode theory results are in satisfactory agreement with the theory of a BWO with reflections and with particle-in-cell simulations.Index Terms-Backward-wave oscillator (BWO), beam-wave interaction, clinotron, inclined electron beam, interaction efficiency, multimode theory, optimal inclination angle, resonant.

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“…By adding a metallic roof mirror directly above the grating (with a distance from the grating of integer multiples of half the SPR wavelength at θ ¼ 90°), an open cavity resonator is formed, similar to the Orotron [4,9,[39][40][41][42]. The strong standing wave in the cavity interacts with the electron beam to cause bunching of the electrons.…”

Section: Introductionmentioning

confidence: 99%

“…Smith-Purcell radiation (SPR) is one particularly promising choice for developing such THz sources, which have significant potential applications in many areas, such as high-resolution imaging, noninvasive sensing, high-data rate communications and material analysis [1,2,[4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

Zhang

Ang

Gover

2015

Phys. Rev. ST Accel. Beams

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This paper studies various mechanisms to enhance the coherent Smith-Purcell radiation (SPR) at terahertz frequencies using particle-in-cell (PIC) simulations. A simple analytical dispersion relation is derived to predict the frequency of the evanescent surface wave of the open grating, which is excited by a backward-wave oscillation mechanism and emits radiation at harmonics of this frequency, and the cavity mode frequencies of the Orotron-like device, all in excellent agreement with the simulation data. The grating parameters are optimized to minimize the starting current of a continuous electron beam for exciting coherent SPR. It is demonstrated that a prebunched beam can be used to selectively excite coherent SPR at desired SPR angle and frequencies that are higher harmonics of the beam bunching frequency, where the starting current requirement is eliminated. Our PIC simulations show the dynamics of modes development and competition for the Orotron-like open cavity structure, which owns a lower starting current than the surface mode process. This oscillation mode dominates at steady state and enhances the radiated power by more than 2 orders of magnitude.

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Experimental demonstration of Smith–Purcell radiation enhancement by frequency multiplication in open cavity

Cited by 38 publications

References 20 publications

Experimental study of intense radiation in terahertz region based on cylindrical surface wave resonator

Experimental study of intense radiation in terahertz region based on cylindrical surface wave resonator

Theory of Multimode Resonant Backward-Wave Oscillator With an Inclined Electron Beam

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

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