Electromagnetic Processes at High Energies in Oriented Single Crystals

Baier, V.N.; Katkov, V. M.; Strakhovenko, V. M.

doi:10.1142/2216

Cited by 490 publications

(998 citation statements)

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“…It is known that a charged particle traversing a medium loses kinetic energy, which is partly converted into electromagnetic radiation (the bremsstrahlung effect; Bethe, 1934). Photon emission through coherent bremsstrahlung is more intense than for the incoherent case (Baier et al, 1998). Moreover, if the crystal is bent, it is possible to conveniently exploit VR to produce radiation.…”

Section: Figurementioning

confidence: 99%

The `quasi-mosaic' effect in crystals and its applications in modern physics

et al. 2015

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`Quasi‐mosaicity' is an effect of anisotropy in crystals that permits one to obtain a curvature of internal crystallographic planes that would be flat otherwise. The term `quasi‐mosaicity' was introduced by O. Sumbaev in 1957. The concept of `quasi‐mosaicity' was then retrieved about ten years ago and was applied to steering of charged‐particle beams at the Super Proton Synchrotron at CERN. Beams were deviated by exploiting channeling and volume reflection phenomena in curved crystals that show the `quasi‐mosaic' effect. More recently, a crystal of this kind was installed in the Large Hadron Collider at CERN for beam collimation by the UA9 collaboration. Since 2011, another important application involving the `quasi‐mosaic' effect has been the focalization of hard X‐rays and soft γ‐rays. In particular, the possibility of obtaining both high diffraction efficiency and the focalization of a diffracted beam has been proved, which cannot be obtained using traditional diffracting crystals. A comprehensive survey of the physical properties of `quasi‐mosaicity' is reported here. Finally, experimental demonstrations for adjustable values of the `quasi‐mosaic' curvature are provided.

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Section: Figurementioning

confidence: 99%

The `quasi-mosaic' effect in crystals and its applications in modern physics

et al. 2015

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“…[5] an analytical method of calculations in the framework of semiclassical approach was developed and new numerical results were presented. The radiation emission spectra of polarized photons in semiclassical approach were calculated in [2,6] and first numerical results were presented in our previous paper [6]. These papers demonstrate an essential difference of exact spectra from the corresponding results of coherent theory at small angles ϑ 0 ≤ ϑ v .…”

Section: Introductionmentioning

confidence: 96%

“…Strakhovenko has been developed a general theory of basic QED processes in strong crystalline fields (see i.e. new English edition of their book [2]). This theory is not restricted by the first Born approximation and is based on the semiclassical character of motion of ultrarelativistic particles in strong fields.…”

Section: Introductionmentioning

confidence: 99%

Hard polarized photon emission in single crystals by high energy electrons for planar crystal orientations

Darbinyan

Ter-Isaakyan

2002

Nuclear Instruments and Methods in Physics Research Section B:

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The radiation emission spectra of polarized photons emitted from charge particle in single crystal are obtained in semiclassical theory in Baer-Katkov-Strakhovenko approximation for planar crystal orientation. The range of applicability of this approximation is estimated by comparing the results with calculations in exact semiclassical theory. Optimal crystal orientations for producing unpolarized and polarized photon beams are also founded.

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“…This polarization phenomenon should be observed for symmetric orientations of single crystals with respect to the direction of motion of γ-quanta. Semilar effects for the production or analysis of polarized γ-quanta have been discussed in [4]- [11]. The anisotropic medium is determined as medium, whose optical properties can be described using a symmetric permittivity tensor [12].…”

Section: Introductionmentioning

confidence: 99%

“…where σ γ is the total cross section [11] of e ± -pair production by γ-quanta with the initial ξ 1 (0), ξ 3 (0)-Stokes parameters and N is the number of atoms per unit volume. Notice that the dependence on ξ 2 (0) appears only at x 2 -terms (and higher) in the expansion (if X 2 = 0).…”

Section: Introductionmentioning

confidence: 99%