Superradiant THz undulator radiation source based on a superconducting photo-injector

Wen, Xiaodong; Huang, Senlin; Lin, Lin; Fang, Wang; Zhu, Feng; Feng, Lixin; Yang, Limin; Wang, Zhiwen; Fan, Peiliang; Hao, Jiankui; Quan, Shengwen; Liu, Kexin; Chen, Jiaer

doi:10.1016/j.nima.2016.03.003

Cited by 15 publications

(10 citation statements)

References 17 publications

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“…Its intensity and, consequently, the angular momentum of radiation produced by it are proportional to the square of the particle number in the bunch of charged particles. As for the plane-wave photons, their coherent edge radiation was already observed experimentally [21,[23][24][25].…”

Section: Introductionmentioning

confidence: 66%

“…Of course, this property is a consequence of the approximations made in replacing the exact particle trajectory by the two straight lines (30). Such a simple dependence on k 0 disappears when the conditions (25), (29), and (33) become violated. In particular, when one considers the reflection of ultrarelativistic electrons (or positrons) from a crystal (see, e.g., [45][46][47][48][49][50][51][52][69][70][71][72]), the trajectory of the particle can be replaced by (30) in evaluating the radiation of twisted photons provided that the photon energy satisfies the estimate…”

Section: Trajectories With a Break On The Detector Axismentioning

confidence: 99%

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Probability of radiation of twisted photons in the infrared domain

2019

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The infrared asymptotics of probability of radiation of twisted photons in an arbitrary scattering process of quantum electrodynamics (QED) in a vacuum is investigated. This asymptotics is universal and corresponds to the radiation produced by a classical current. Such a radiation is known as the edge radiation. We represent it in terms of the twisted photons: the exact analytical formulas for the average number of radiated twisted photons are derived. We find the average projection of the total angular momentum of the edge radiation and the angular momentum per photon. It is shown that the edge radiation can be used as a source of twisted photons with large angular momentum. Moreover, this radiation can be employed as a superradiant coherent source of twisted photons in the infrared domain, in particular, in the THz part of the electromagnetic spectrum. Several general selection rules for the radiation and absorbtion of twisted photons are proved. These selection rules allow one, in particular, to modulate the one-particle radiation probability by means of scattering of charged particles on symmetrically arranged crystals. *

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Section: Introductionmentioning

confidence: 66%

Section: Trajectories With a Break On The Detector Axismentioning

confidence: 99%

Probability of radiation of twisted photons in the infrared domain

2019

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“…THz undulator radiation sources are widely studied in the accelerator community [10][11][12][13][14][15][16][17], and there is continuous interest to produce radiation pulses with shorter duration [18][19][20]. To meet the demands of ultrashort THz radiation pulses, a scheme is proposed to generate quasi-halfcycle THz pulses, which is emitted from a frequencychirped electron bunch train traversing an optimally tapered undulator [21,22].…”

Section: Introductionmentioning

confidence: 99%

Generation of frequency-chirped density modulation electron beam for producing ultrashort THz radiation pulse

Zhang

Wang

Jiang

et al. 2020

Phys. Rev. Accel. Beams

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A new scheme is proposed to generate electron beams with a frequency-chirped density modulation for producing ultrashort THz radiation pulse in an optimally tapered undulator. In this scheme, an energy chirped electron beam is sequentially modulated in two modulators by interacting with two laser pulses with the same central frequency but different chirp rates, practically one laser pulse is linearly chirped and the other is chirpfree. Two dispersion sections are applied to transfer the energy modulation formed in the modulators to the desired density modulation. The central frequency of the density modulation of the electron beam can be continuously tuned by changing the compression coefficients of the dispersion sections, and the chirp rate of the final modulation frequency can also be tuned by either varying the compression coefficients or the linear chirp rates of the modulation laser pulses. The generation of ultrashort and broadband THz radiation pulses is also briefly discussed.

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“…Consequently, it requires a low construction and operation cost, which is suitable for a small research laboratory. Currently, such sources have been developed in many laboratories, for example, FEL-CATs (0.4 to 0.7 THz) at ENEA Frascati [2] and the compact system at Peking University [3].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Bunch Compressor and Compressed Electron Beam Characteristics by Coherent Transition Radiation

et al. 2018

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A magnetic chicane bunch compressor for a new compact accelerator-based terahertz (THz) radiation source at the Institute of Advanced Energy, Kyoto University, was completely installed in March 2016. The chicane is employed to compress an electron bunch with an energy of 4.6 MeV generated by a 1.6-cell photocathode radio frequency (RF)-gun. The compressed bunch is injected into a short planar undulator for THz generation by coherent undulator radiation (CUR). The characteristics of the bunch compressor and the compressed bunch were investigated by observing the coherent transition radiation (CTR). The CTR spectra, which were analyzed by using a Michelson interferometer, and the compressed bunch length were also estimated. The results were that the chicane could compress the electron bunch at a laser injection phase less than 45 degrees, and the maximum CTR intensity was observed at a laser injection phase around 24 degrees. The optimum value of the first momentum compaction factor was around −45 mm, which provided an estimated rms bunch length less than 1 ps.

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Superradiant THz undulator radiation source based on a superconducting photo-injector

Cited by 15 publications

References 17 publications

Probability of radiation of twisted photons in the infrared domain

Probability of radiation of twisted photons in the infrared domain

Generation of frequency-chirped density modulation electron beam for producing ultrashort THz radiation pulse

Investigation of Bunch Compressor and Compressed Electron Beam Characteristics by Coherent Transition Radiation

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