On the surface shape of an X-ray monochromator

It is established that the surface of a monochromator for a point X-ray source in diffractometers is the surface of revolution of a circle arc around the straight line connecting the X-ray source and detector. It is shown that scattering occurs at the points of intersection of the monochromator surface with the set of ellipsoids of revolution, in whose focuses the X-ray source and detector are located. A formula is obtained for calculating the misorientation angle of mosaic blocks. The limits of variation in the angle for Fe \(K_{\alpha _1 } \), Cu \(K_{\alpha _1 } \), and Mo \(K_{\alpha _1 } \) radiations are determined. It is shown that there is no unified continuous reflecting monochromator surface, and the true reflecting surface is fractal.