Coherent Terahertz Smith–Purcell radiation from beam bunching

Shi, Zongjun; Yang, Ziqiang; Liang, Zheng; Lan, Feng; Liu, Wenxin; Gao, Xi; Li, D.

doi:10.1016/j.nima.2007.05.315

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…There also exist evanescent waves occurring within near-field region, specifically in front and at the end of the grating edges. These slow waves appear at delayed time compared to the SPR signal [20,21]. Coherent SPR can be generated from the beam featuring the bunch length shorter than the grating period as well as the wavelength of SPR.…”

Section: Introductionmentioning

confidence: 99%

An alternative technique for verification of terahertz Smith–Purcell radiation

Rattanawan¹,

Chulapakorn²,

Tanapirom³

et al. 2021

J. Phys. D: Appl. Phys.

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An alternative technique to verify terahertz (THz) Smith-Purcell radiation (SPR) was proposed by using different grating periods. A compact DC electron gun, serving as a THz source, was modified to generate continuous 35 keV electron beam that passes by a metal-coated silicon grating in order to induce SPR. A design on beam optics to generate high-brightness beam was carried out by using Computer Simulation Technology (CST) Studio Suite ® software package. The optimization of beam parameters was obtained and experimentally performed. Results show that the root-mean-square (rms) beam size (diameter) is about 1 mm when supplying beam current of 200 µA, and rms beam emittance is about 3π mm mrad. The CST simulation software was, furthermore, employed to observe radiation spectra when using different grating structures. A liquid-helium cooled silicon bolometer together with a low-pass filter was used to detect radiation power. The results reveal that incoherent THz signal with power of 1.5 µW cm −2 is observed when the continuous-beam current is about 200 µA. The dependence of THz frequency and power on the grating period, that is associated to the SPR, was also investigated in this work.

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Section: Introductionmentioning

confidence: 99%

An alternative technique for verification of terahertz Smith–Purcell radiation

Rattanawan¹,

Chulapakorn²,

Tanapirom³

et al. 2021

J. Phys. D: Appl. Phys.

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“…To improve on this performance, it will be necessary to develop electron beams with improved brightness and a better understanding of how these devices operate. Therefore, the experiment at Dartmouth College [7], where coherent radiation in the SP system was observed, has stimulated new investigations concerning the SP FEL as an open slow wave structure [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Induced Smith–Purcell radiation

Klochkov

Artemyev

Oganesyan

et al. 2010

Journal of Modern Optics

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Excitation of induced coherent Smith-Purcell (SP) radiation by relativistic magnetized electron beam in the absence of the resonator is considered within the framework of the dispersion equation. We have found that the dispersion equation for the SP instability is a quadratic equation for frequency. The first-step approximation for solution of the dispersion equation, giving the SP-spectrum of frequency, corresponds to the mirror boundary case, when the electron beam propagates above a plane metal surface (mirror). It was found that the conditions for both the Thompson and the Raman regimes of excitation do not depend on beam current and depend on the height of the beam above the grating surface. The growth rate of the instability in both cases is proportional to the square root of the electron beam current. No feedback is needed to provide the coherent emission.

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