Determining the Collimation Degree for a Coherent X-Ray Beam Using a Planar Multilens Interferometer

Abstract

A method is proposed for determining the degree of collimation of a coherent X-ray beam using a planar multilens interferometer. The method is based on analyzing Talbot images, which are periodic patterns of interference fringes formed by the interferometer at appropriate distances. The high sensitivity of the position and period of the interference fringes to the shape of the X-ray beam wave front makes it possible to determine the degree of its collimation, as well as to evaluate the coherent properties of the radiation. The effectiveness of the proposed approach has been experimentally demonstrated at the ID15B beamline of the ESRF synchrotron radiation source. A theoretical study has been carried out, and the corresponding results of computer simulation have been presented. The experimentally data obtained fully correspond to the theoretical estimates.