A new type of monochromator for synchrotron radiation with three-wave Bragg diffraction

Abstract

A new set‐up of a crystal monochromator with three‐wave Bragg diffraction, which permits to realize a four‐crystal spectrometer in a relatively simple way is offered. Instead of three initial crystals, three sets of reflecting planes from the same crystal are used. The crystal monochromator, consisting of three blocks on a common basis and using the symmetric Bragg three‐wave coplanar scattering is described in detail. A calculation of the angular and spectral characteristics of the crystal monochromator in the case (044/440) of three‐wave diffraction in silicon is carried out. The calculation shows that the considered set‐up of reflecting surface blocks is highly effective.