Observation of superradiant synchrotron radiation in the terahertz region

Billinghurst, Brant; Bergstrom, John C.; Dallin, Les; Jong, Mark De; May, Tim; Vogt, J.; Wurtz, Ward

doi:10.1103/physrevstab.16.060702

Cited by 17 publications

(17 citation statements)

References 12 publications

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“…A detailed view ∼600 GHz reveals a 352 MHz FC superimposed on the broad THz emission, Fig. 2b , as previously observed in other facilities 12 . The lower panel shows the heterodyne analysis of the CSR.…”

Section: Resultssupporting

confidence: 83%

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High density terahertz frequency comb produced by coherent synchrotron radiation

et al. 2015

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Frequency combs have enabled significant progress in frequency metrology and high-resolution spectroscopy extending the achievable resolution while increasing the signal-to-noise ratio. In its coherent mode, synchrotron radiation is accepted to provide an intense terahertz continuum covering a wide spectral range from about 0.1 to 1 THz. Using a dedicated heterodyne receiver, we reveal the purely discrete nature of this emission. A phase relationship between the light pulses leads to a powerful frequency comb spanning over one decade in frequency. The comb has a mode spacing of 846 kHz, a linewidth of about 200 Hz, a fractional precision of about 2 × 10−10 and no frequency offset. The unprecedented potential of the comb for high-resolution spectroscopy is demonstrated by the accurate determination of pure rotation transitions of acetonitrile.

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Section: Resultssupporting

confidence: 83%

“…It has provided unprecedented power in the region 0.1−1 THz, up to 4 orders of magnitude brighter than standard incoherent synchrotron radiation 10 11 . Super-Radiance effects obtained from bunch-to-bunch interference 12 further enhance specific frequencies ( 1/T bunch where T bunch is the time interval between successive bunches) of the THz CSR.…”

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confidence: 99%

High density terahertz frequency comb produced by coherent synchrotron radiation

et al. 2015

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“…However, there are numerous demonstrations of CSR emission with synchrotron storage rings also in the THz regime [11][12][13]207]. Billinghurst et al at the Canadian Light Source report observation of superradiance at frequencies that were harmonics of the electron beam pulse train [193]. Synchrotron storage rings employ RF frequencies of 500 MHz and lower.…”

Section: Under Construction In Ariel University Is the Israeli Thz Fementioning

confidence: 99%

Superradiant and stimulated-superradiant emission of bunched electron beams

et al. 2019

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We outline the fundamental coherent radiation emission processes from a bunched charged particles beam. In contrast to spontaneous emission of radiation from a random electron beam that is proportional to the number of particles, a pre-bunched electron beam can emit spontaneously coherent radiation proportional to the number of particles -squared, through the process of (spontaneous) superradiance (SP-SR) (in the sense of Dicke's). The coherent SP-SR emission of a bunched electron beam can be even further enhanced by a process of stimulated-superradiance (ST-SR) in the presence of a seed injected radiation field. In this review, these coherent radiation emission processes for both single bunch and periodically bunched beams are considered in a model of radiation mode expansion.We also analyze here the SP-SR and ST-SR processes in the nonlinear regime, in the context of enhanced undulator radiation from a uniform undulator (wiggler) and in the case of wiggler Tapering-Enhanced Stimulated Superradiant Amplification (TESSA).The processes of SP-SR and TESSA take place also in tapered wiggler seed-injected FELs. In such FELs, operating in the X-Ray regime, these processes are convoluted with other effects. However these fundamental emission concepts are useful guidelines in efficiency enhancement strategy of wiggler tapering. Based on this model we review previous works on coherent radiation sources based on SP-SR (coherent undulator radiation, synchrotron radiation, Smith-Purcell radiation etc.), primarily in the THz regime and on-going works on tapered wiggler efficiency-enhancement concepts in various frequency regimes.

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“…These days 3rd generation (synchrotron radiation storage rings) and 4th generation (linear accelerator free electron lasers) light sources represent the state-of-the-art in photon generation. The storage rings implementing low alpha mode 28 , 31 or utilizing microbunch instabilities generate intense THz radiation beams 33 . The bunch train can be treated as continuous.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, there were no problems generating radiation, however it was difficult to observe the radiation spectrum with high enough spectral resolution. A super-radiant regime was observed at Canadian light source using synchrotron radiation mechanism with a very high resolution Fourier transform spectrometer 28 and in ANKA light source in Germany 29 , however, the width of the observed lines was precisely defined by the spectrometer resolution. Recent advances in high frequency electronics drastically improved the situation.…”

Section: Introductionmentioning

confidence: 99%

Ultra-monochromatic far-infrared Cherenkov diffraction radiation in a super-radiant regime

Karataev

Fedorov

Naumenko

et al. 2020

Sci Rep

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Nowadays, intense electromagnetic (EM) radiation in the far-infrared (FIR) spectral range is an advanced tool for scientific research in biology, chemistry, and material science because many materials leave signatures in the radiation spectrum. Narrow-band spectral lines enable researchers to investigate the matter response in greater detail. The generation of highly monochromatic variable frequency FIR radiation has therefore become a broad area of research. High energy electron beams consisting of a long train of dense bunches of particles provide a super-radiant regime and can generate intense highly monochromatic radiation due to coherent emission in the spectral range from a few GHz to potentially a few THz. We employed novel coherent Cherenkov diffraction radiation (ChDR) as a generation mechanism. This effect occurs when a fast charged particle moves in the vicinity of and parallel to a dielectric interface. Two key features of the ChDR phenomenon are its non-invasive nature and its photon yield being proportional to the length of the radiator. The bunched structure of the very long electron beam produced spectral lines that were observed to have frequencies upto 21 GHz and with a relative bandwidth of 10–4 ~ 10–5. The line bandwidth and intensity are defined by the shape and length of the bunch train. A compact linear accelerator can be utilized to control the resonant wavelength by adjusting the bunch sequence frequency.

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Observation of superradiant synchrotron radiation in the terahertz region

Cited by 17 publications

References 12 publications

High density terahertz frequency comb produced by coherent synchrotron radiation

High density terahertz frequency comb produced by coherent synchrotron radiation

Superradiant and stimulated-superradiant emission of bunched electron beams

Ultra-monochromatic far-infrared Cherenkov diffraction radiation in a super-radiant regime

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