First demonstration of coherent Cherenkov radiation matched to circular plane wave

Sei, N.; Takahashi, Toshiharu

doi:10.1038/s41598-017-17822-z

Cited by 16 publications

(21 citation statements)

References 27 publications

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“…The teflon Cherenkov cone was cut in such a way to build a forward plane-wave of radiation, copropagating with the beam towards the mirror. A significant enhancement of about a factor 3 higher in photon yield with respect to a CTR/CDR radiator was observed at a radiatormirror distance of about 40 cm as well as a slight shift towards a higher peak frequency (proper of the Cherenkov mechanism itself), consistent with the observations in [43]. An average power of about half mW, peaked at 60 GHz with a relative bandwidth of 100% was obtained finally.…”

Section: Comparison Among Different Radiation Mechanismssupporting

confidence: 85%

Beam-based sub-THz source at the CERN linac electron accelerator for research facility

Curcio

Bergamaschi

Corsini

et al. 2019

Phys. Rev. Accel. Beams

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We report on the radiation studies performed at the CLEAR facility of CERN in the sub-THz range, exploiting picosecond ultrarelativistic electron bunches for the production of coherent radiation. The coherent radiation, produced by different mechanisms (in particular coherent transition radiation), has been fully characterized using different techniques and detectors. The main aim has been that to setup a new beam-based source of radiation in the mm-waves for external users, individuating the performances and the limitations. Moreover the coherent radiation has been used for longitudinal diagnostics, providing reliable bunch length values consistent with other diagnostics. Transverse shaping of the radiation source has been also demonstrated via control of the size and divergence of the electron bunch at the source plane. The mechanism yielding the highest peak-power has been the Cherenkov-Diffraction Radiation, providing ∼0.1 MW. The current performances of the CLEAR THz source seem to be more suitable for highaverage-power than high-peak-power applications. Future plans and strategies will look toward the realization of a high-peak-power source, providing ∼10-100 MW THz pulses.

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Section: Comparison Among Different Radiation Mechanismssupporting

confidence: 85%

Beam-based sub-THz source at the CERN linac electron accelerator for research facility

Curcio

Bergamaschi

Corsini

et al. 2019

Phys. Rev. Accel. Beams

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“…formed with an L-band electron linac at KURNS-LINAC. Various types of coherent radiations have been studied in this facility [31][32][33][34] , and a THz-band beamline that can supply coherent transition radiation for spectroscopic experiments has been constructed 35 . Because a large diffractor assembly with a volume of 10 cm 3 or more can be installed in the aluminium vacuum chamber which is used for generation of the coherent transition radiation, the CBDR can generate at frequencies less than 0.1 THz.…”

Section: Experimental Setup At Kurns-linac the Demonstration Experimmentioning

confidence: 99%

First demonstration of coherent resonant backward diffraction radiation for a quasi-monochromatic terahertz-light source

Sei

Takahashi

2020

Sci Rep

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We proposed coherent resonant backward diffraction radiation (CRBDR), which generates wavelengthtunable quasi-monochromatic lights using a compact diffractor assembly in an accelerator facility of high-energy electron beams, as a unique intense terahertz (THz) light source. Superimposing the coherent backward diffracted radiation emitted by periodically arranged hollow diffractors, it is possible to amplify the frequency components satisfying a resonant condition, and make the radiation monochromatic. We demonstrated the CRBDR using the L-band linac at the Institute for Integrated Radiation and Nuclear Science at Kyoto University. It was observed that the coherent backward diffraction radiation was amplified more than three times at a frequency which was the fundamental resonant frequency in the CRBDR theory. Moreover, the number of diffractors at the saturation of the radiation power was consistent with the number estimated from the electron distribution in a bunch. The experimental results show that the CRBDR is useful as a quasi-monochromatic light source in the THz band.

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Section: Introductionmentioning

confidence: 99%

“…Radiation of charged particles moving in the presence of dielectric objects ("targets") is of vital interest for various applications [1][2][3][4][5]. For example, several experiments have shown that prismatic and conical targets can be prospective for both bunch diagnostics and generation of high-power radiation [2][3][4][5]. Further development of these topics requires an accurate calculation of Cherenkov radiation (CR) outside dielectric objects, which is typically impossible to do rigorously due to the complicated geometry of these objects.…”

Section: Introductionmentioning

confidence: 99%

Radiation of charge moving through a dielectric spherical target: ray optics and aperture methods

Tyukhtin,

Belonogaya,

Galyamin

et al. 2020

Preprint

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Radiation of charged particles moving in the presence of dielectric targets is of significant interest for various applications in the accelerator and beam physics. The size of these targets is typically much larger than the wavelengths under consideration. This fact gives us an obvious small parameter of the problem and allows developing approximate methods for analysis. We develop two methods, which are called the "ray optics method" and the "aperture method". In the present paper, we apply these methods to analysis of Cherenkov radiation from a charge moving through a vacuum channel in a solid dielectric sphere. We present the main analytical results and describe the physical effects. In particular, it is shown that the radiation field possesses an expressed maximum at a certain distance from the sphere at the Cherenkov angle. Additionally, we perform simulations in COMSOL Multiphysics and show a good agreement between numerical and analytical results.

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First demonstration of coherent Cherenkov radiation matched to circular plane wave

Cited by 16 publications

References 27 publications

Beam-based sub-THz source at the CERN linac electron accelerator for research facility

Beam-based sub-THz source at the CERN linac electron accelerator for research facility

First demonstration of coherent resonant backward diffraction radiation for a quasi-monochromatic terahertz-light source

Radiation of charge moving through a dielectric spherical target: ray optics and aperture methods

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