Proposal of coherent Cherenkov radiation matched to circular plane wave for intense terahertz light source

Sei, N.; Sakai, Takeshi; Hayakawa, Katsumi; Tanaka, Toshinari; Hayakawa, Yasushi; Nakao, Keisuke; Nogami, Keiji; Inagaki, Manabu

doi:10.1016/j.physleta.2015.05.033

Cited by 13 publications

(13 citation statements)

References 28 publications

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“…Because the CCR passed through the dielectric, the CCR pulse was detected later than the CDR pulse. The distance of the satellite pulse from the centre burst position was proportional to the height of the hollow conical dielectric L h 14 . This distance Δ is given by the following equation: where n is the refractive index of the dielectric.…”

Section: Resultsmentioning

confidence: 99%

“…The intensity of the CCR-MCP can be evaluated by calculating the difference from the relative intensity of the background radiation. According to the theory of the CCR-MCP, the intensity is related to L h by the following equation 14 : where α d is an absorption coefficient of the hollow conical dielectric. By fitting the data of the intensity of the CCR-MCP and L h obtained from Fig.…”

Section: Resultsmentioning

confidence: 99%

“…We plan to develop an intense wave source based on the CCR-MCP at the Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University, where previously a CTR with the energy of 0.1 μJ per micropulse has been developed 24 , 28 . Because the bunch length of the electron beam with the charge of 30 pC per micropulse can be made shorter than 0.5 ps at the LEBRA, creating a broadband THz-wave source with the energy of 1 μJ per micropulse or more will become possible 14 . By using a higher-quality electron beam, it is not difficult to develop a broadband THz-wave source with the pulse energy exceeding 10 μJ.…”

Section: Discussionmentioning

confidence: 99%

“…In order to obtain such an intense wave source in an existing compact accelerator facility, a new method of generating the wave source should be developed that may be used instead of the coherent synchrotron radiation and coherent transition radiation (CTR) 7 , 13 . Recently, we proposed a method of coherent Cherenkov radiation (CCR) matched to a circular plane wave that utilized a hollow conical dielectric 14 . Because the electron beam passes through the hollow part of the conical dielectric to generate the CCR beam 15 , the loss of the electron beam is negligible.…”

Section: Introductionmentioning

confidence: 99%

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First demonstration of coherent Cherenkov radiation matched to circular plane wave

Sei

Takahashi

2017

Sci Rep

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We observed coherent Cherenkov radiation matched to a circular plane wave (CCR-MCP) for the first time using a hollow conical dielectric made of a high-density polyethylene. The refractive index and the absorption coefficient of the dielectric were evaluated to be 1.537 ± 0.004 and 0.006 ± 0.028 by measuring the pulse formed by the interference between the CCR-MCP and the coherent diffraction radiation. These values were consistent with the values shown in a reference for the high-density polyethylene. In accordance with the theory of the Cherenkov radiation, the spectrum of the CCR-MCP shifted towards higher wavenumbers compared to that of the coherent diffraction radiation. The intensity of the CCR-MCP beam was proportional to the height of the hollow conical dielectric and was 3 times the intensity of the coherent diffraction radiation. The CCR-MCP technique can produce broadband terahertz-wave sources with unprecedented power at compact accelerator facilities.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

First demonstration of coherent Cherenkov radiation matched to circular plane wave

Sei

Takahashi

2017

Sci Rep

Self Cite

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“…The main applications of interest are development of beam-driven radiation sources (based on high-quality beams produced by modern accelerators) and non-invasive systems for bunch diagnostics. For example, both prismatic target and hollow conical target with the flat out surface (accompanied by the set of external mirrors) have been used in a series of experiments on microwave and Terahertz CR [10][11][12]. The papers [11,12] should be especially noted in the context of the present paper since they used similar radiator.…”

Section: Introductionmentioning

confidence: 99%

Cherenkov Radiation of a Charge Flying through the "Inverted" Conical Target

Tyukhtin,

Galyamin,

Vorobev

et al. 2020

Preprint

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Radiation generated by a charge moving through a vacuum channel in a dielectric cone is analyzed. It is assumed that the charge moves through the cone from the apex side to the base side (the case of "inverted" cone). The cone size is supposed to be much larger than the wavelengths under consideration. We calculate the wave field outside the target using the "aperture method" developed in our previous papers. Contrary to the problems considered earlier, here the wave which incidences directly on the aperture is not the main wave, while the wave once reflected from the lateral surface is much more important. The general formulas for the radiation field are obtained, and the particular cases of the ray optics area and the Fraunhofer area are analyzed. Significant physical effects including the phenomenon of "Cherenkov spotlight" are discussed. In particular it is shown that this phenomenon allows reaching essential enhancement of the radiation intensity in the far-field region at certain selection of the problem parameters. Owing to the "inverted" cone geometry, this effect can be realized for arbitrary charge velocity, including the ultra relativistic case, by proper selection of the cone material and the apex angle. Typical radiation patterns in the far-field area are demonstrated.

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Circuit Model for an Ultrathin Metasurface Based on a Broadband Tungsten Solar Absorber

Mortazavifar

Salehi

Shahraki

2022

J. Electron. Mater.

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Proposal of coherent Cherenkov radiation matched to circular plane wave for intense terahertz light source

Cited by 13 publications

References 28 publications

First demonstration of coherent Cherenkov radiation matched to circular plane wave

First demonstration of coherent Cherenkov radiation matched to circular plane wave

Cherenkov Radiation of a Charge Flying through the "Inverted" Conical Target

Circuit Model for an Ultrathin Metasurface Based on a Broadband Tungsten Solar Absorber

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