Recent European advances in monochromator design for use with synchrotron radiation sources

Abstract

The monochromators initially installed on synchrotron radiation sources throughout the world were not, generally speaking, designed to take full account of the characteristics of the electron beam cross section of the accelerator or the unique angular distribution of the synchrotron radiation. In the recent generation of monochromators, more care is being taken to match the characteristics of the monochromator with those of the source, in an attemps to optimise the product of throughout and resolution. One must, however, take account of the high photon flux in the new generation of high current storage rings in designing an integrated optical system. Moreover, there is a range of experiments where it is crucial to remove unwanted high spectral orders from the monochromator output. Such considerations may have a considerable bearing on the final design of a monochromator. The present report will outline the approach presently being taken at the European facilities at Bonn, Daresbury, DESY (Hamburg), FRASCATI and LURE (Paris).