Orbital angular momentum of channeling radiation from relativistic electrons in thin Si crystal

Abdrashitov, S.V.; Bogdanov, O.V.; Kazinski, P. O.; Tukhfatullin, T.A.

doi:10.1016/j.physleta.2018.07.044

Cited by 33 publications

(23 citation statements)

References 23 publications

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“…The last term under the modulus sign describes the contribution of transition radiation. It reaches a maximum when (89). Due to the symmetry of the problem, the radiation probability is concentrated at m = 0.…”

Section: Thick Dielectric Platementioning

confidence: 99%

“…Of course, there are other pure sources of twisted photons such as undulators and laser waves where the twisted photons are produced directly by charged particles [57, 58, 60-62, 73-81, 83-86]. The hard twisted photons with energies of order of hundreds MeVs can be generated by inverse Compton scattering of low energy twisted photons [87,88] or in channeling [89,90].…”

Section: Introductionmentioning

confidence: 99%

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Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

2019

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The general formula for probability to record a twisted photon produced by a charged particle moving in an inhomogeneous isotropic dispersive medium is derived. The explicit formulas for probability to record a twisted photon are obtained for the radiation of a charged particle traversing a dielectric plate or an ideally conducting foil. It is shown that, in the case when the charged particle moves along the detector axis, all the radiated twisted photons possess a zero projection of the total angular momentum and the probability of their radiation is independent of the photon helicity. The radiation produced by helically microbunched beams of charged particles is also considered. The fulfillment of the strong addition rule for the projection of the total angular momentum of radiated twisted photons is demonstrated. Thus the helical beams allow one to generate coherent transition and Vavilov-Cherenkov radiations with large projections of the total angular momentum. The radiation produced by charged particles in a helical medium is studied. Typical examples of such a medium are metallic spirals and cholesteric liquid crystals. It is shown that the radiation of a charged particle moving along the helical axis of such a medium is a pure source of twisted photons. *

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Section: Thick Dielectric Platementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

2019

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“…The hard twisted photons can be employed to study the properties of nuclear matter by exciting higher multipole transitions in nuclei and hadrons (see, e.g., the discussion in [24,25,41,42]). Rather recently, it was shown that hard twisted photons can be generated in channeling radiation [43,44] and strong laser pulses [41,[45][46][47][48]. In Sec.…”

Section: Introductionmentioning

confidence: 99%

Semiclassical probability of radiation of twisted photons in the ultrarelativistic limit

2019

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The semiclassical general formula for the probability of radiation of twisted photons by ultrarelativistic scalar and Dirac particles moving in the electromagnetic field of a general form is derived. This formula is the analog of the Baier-Katkov formula for the probability of radiation of one plane wave photon with the quantum recoil taken into account. The derived formula is used to describe the radiation of twisted photons by charged particles in undulators and laser waves. Thus, the general theory of undulator radiation of twisted photons and radiation of twisted photons in the nonlinear Compton process is developed with account for the quantum recoil. The explicit formulas for the probability to record a twisted photon are obtained in these cases. In particular, we found that the quantum recoil and spin degrees of freedom increase the radiation probability of twisted photons in comparison with the formula for scalar particles without recoil. In the range of applicability of the semiclassical formula, the selection rules for undulator radiation established in the purely classical framework are not violated. The manifestation of the blossoming out rose effect in the nonlinear Compton process in a strong laser wave with circular polarization and in the wiggler radiation is revealed. Several examples are studied: the radiation of MeV twisted photons by 180 GeV electrons in the wiggler; the radiation of twisted photons by 256 MeV electrons in strong electromagnetic waves produced by the CO 2 and Ti:Sa lasers; and the radiation of MeV twisted photons by 51.1 MeV electrons in the electromagnetic wave generated by the FEL with photon energy 1

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“…Such results have been demonstrated experimentally by observing helical undulator radiations [8]. More recently it has been shown that twisted photons in the Mev energy range can be provided by channeling radiation [9,10].…”

Section: Introductionmentioning

confidence: 82%

Single-shot measurement of phase and topological properties of orbital angular momentum radiation through asymmetric lateral coherence

Paroli

Siano

Teruzzi

et al. 2019

Phys. Rev. Accel. Beams

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We show a single-shot technique to measure topological and phase properties of radiation carrying orbital angular momentum. The single-shot method is effectively described as the one-dimensional case of a more general two-dimensional approach based on scanning interferometry (asymmetric lateral coherence). The validity of the method has been experimentally verified and the applicability to ultrarelativistic sources of hard x-rays has been discussed. The method is suitable to characterize phase and topological properties of x-ray sources by using simple apertures.

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Orbital angular momentum of channeling radiation from relativistic electrons in thin Si crystal

Cited by 33 publications

References 23 publications

Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

Semiclassical probability of radiation of twisted photons in the ultrarelativistic limit

Single-shot measurement of phase and topological properties of orbital angular momentum radiation through asymmetric lateral coherence

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