A theory concerning the coherent X ray radiation of relativistic electrons crossing an artificial periodic medium in Laue scattering geometry has been constructed. Expressions describing the spectral angular characteristics of radiation in the Bragg scattering direction have been obtained and studied. Radia tion is considered in analogy with that in the crystal medium as a result of the coherent summation of the con tributions of two radiation mechanisms, in particular, parametric X ray radiation (PXR) and diffracted tran sition radiation (DTR). It is shown that the DTR yield from a layered target can exceed the particle radiation yield in a single crystal radiator by one order or more under similar conditions.
A theory of coherent X-ray radiation of a relativistic electron crossing the artificial periodic medium in the Laue scattering geometry is constructed. The expressions describing the spectral and angular characteristics of radiation in the direction of Bragg scattering are obtained and investigated. By analogy with the radiation emission in a crystalline medium this radiation is considered as the result of coherent summation of the contributions of two radiation mechanisms: parametric (PXR) and diffracted transition (DTR). It is shown that the yield of DTR from layered target can be more than one order higher than the yield in single crystal radiator, under similar conditions. The manifestations of the Borrmann effect for DTR in the artificial multilayer environment are demonstrated for a Laue scattering geometry.
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