Coherent X-ray radiation from a relativistic electron in a combined medium

Abstract

Abstract-A theory of coherent X-ray radiation from a relativistic electron crossing a com bined m edium that consists of am orphous and crystal plates is constructed w ithin the dynamic diffraction theory. The field reflec tion asymmetry relative to the target surface determ ined by the angle between the atom ic planes and the target surface is taken into account in the theory. The expressions describing the spectral-angular densities of para m etric X-ray and diffracted transition radiations in this m edium are derived and investigated.

Diffracted transition radiation of a relativistic electron in a three-layer structure

“…This problem was considered in our previous pub lication [23]. The case of a three-layer target, considered here, is also of special interest because, on the one hand, it indicates a transition to a multilayer system and, on the other hand, it makes it possible to describe an elementary system consisting of two layers separated by a vacuum layer.…”

“…The emission and diffraction of X-ray waves in the crystal layer in direction kg can be described in the two-wave approximation of dynamic diffraction the ory [24] analogously to [22,25] Considering the emission process in a three-layer structure analogously to emission in a two-layer struc ture [23] and using the apparatus of dynamic theory of diffraction of X-ray waves in the crystal wafer described in [22,25], we obtain the following expres sion for radiation amplitude ^)Rad in the direction of Bragg scattering, which can be written as the sum of the amplitudes of diffracted transition radiation and parametric X-ray radiation: j4s)RcLd _ 2 " ^DTR ^PXR? (3a) …”

“…In [23], coherent X-ray radiation of a relativistic electron was considered in a two-layer structure consisting o f an amorphous layer and a crystal layer; the possibility of increasing the DTR intensity in this type o f structure was demonstrated.…”