Crystal-based diffraction focusing elements for third-generation synchrotron radiation sources

In this work various designs of crystal-based Bragg-Fresnel elements are analyzed from the viewpoint of increasing a radiation flux collected in the focus and technological possibilities for their fabrication. To increase the radiation flux collected in the focus the creation of additional zones contributing to the first diffraction order is proposed, which terminate when their width reaches the technological limit of the used procedure, Further flux increase can be achieved by creating zones contributing to the third diffraction order. (C) 2001 Elsevier Science B.V. All rights reserved.