Circulation source of hard monochromatic photons on the base of coherent radiation of electrons at moderate energies in a crystal

The creation possibility of a high performance monochromatic source of a hard radiation on the basis of compact electron accelerators of moderate energies is considered. Two possible mechanisms, parametric radiation and coherent Bremsstrahlung radiation of electrons in the crystalline target are considered, that allows to gain hard monochromatic radiation in a broad band of energies of photons from few keV up to tens of MeV. For magnification of photon radiation yield the special scheme of a combined recirculation source with multiple crossing of the crystalline target by electrons is analyzed. In the similar scheme the output of monochromatic radiation can be increased on the order