Abstract
Abstract
In this paper, a coherent X-ray radiation of relativistic
electrons in a composite target is developed. The composite target
consists of two amorphous layers and one layer having a structure of
a periodic layered medium with three different layers per period,
located at a given angle relative to the target surface. The paper
considers coherent X-ray radiation behind the rear surface of a
target, i.e. radiation in a periodic layered medium, in the Laue
scattering geometry. Within the framework of the two-wave
approximation of the dynamic theory of X-ray diffraction in a
periodic layered medium, expressions are obtained that describe the
amplitudes of parametric X-ray radiation and diffracted transition
radiation. Then, the case when the second layer is a vacuum is
considered. Expressions are obtained that describe the
spectral-angular and angular densities of PXR, DTR and their
interference. The possibility of significantly increasing the
spectral-angular density of DTR due to the total contribution to it
of transition radiation waves from the amorphous layer, the front
boundary of the periodic layered structure and their constructive
interference is shown. The possibility of increasing the
spectral-angular and angular densities of DTR due to the choice of
the asymmetry of the reflection of the electron field and X-ray
radiation in the third layer is shown.