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Spectrum broadening effect in coherent x-ray radiation of a relativistic electron crossing a single-crystal plate

Research paper by S. V. Blazhevich, A. V. Noskov

Indexed on: 13 Aug '09Published on: 13 Aug '09Published in: Russian Physics Journal



Abstract

Based on the dynamic diffraction theory [1], coherent x-ray radiation of a relativistic electron crossing a single-crystal plate at a constant velocity is considered in the Bragg geometry. In the general case of asymmetric reflection of the radiation from the target, expressions are derived for the spectral-angular distribution of parametric x-ray radiation (PXR) and diffraction transition radiation (DTR). For a fixed angle between the electron trajectory and the system of parallel atomic planes of the crystal (Bragg’s angle) it is shown that a decrease in the angle of electron incidence on the crystal plate gives rise to a significant increase in the PXR and DTR spectra, and the causes for spectral broadening for each of these radiation mechanisms are different.