On X-ray sources based on Cherenkov and quasi-Cherenkov emission mechanisms

A variety of possible schemes of X-ray sources based on Cherenkov like emission mechanisms is considered theoretically. The possibility to increase substantially an angular density of parametric X-ray source under conditions of grazing incidence of emitting relativistic electrons on the reflecting crystallographic plane of a crystalline target is shown. The growth of Cherenkov X-ray angular density due to modification of the structure of Cherenkov cone in conditions of grazing incidence of an electron beam in the surface of a target is discussed as well as the peculiarities of Cherenkov X ray generation from relativistic electrons crossing a multilayer nanostructure. The question of relative contributions of parametric X-ray and diffracted bremsstrahlung to total emission yield from relativistic electrons moving in a perfect crystal is elucidated. X-ray generation during multipasses of an electron beam through an internal target in circular accelerator is considered as well.