Abstract
Several X-ray optical elements based on multilayer have been recently developed and have come onto the market. Its reflectivity is above 70 % for CuKα radiation. As these elements are artificially synthesized by means of spattering technique, it is possible to control the spacing of multilayer with its location and also possible to bend it along a geometrical curve. Thus, those elements have many applications to X-ray scattering and diffraction as various concave mirrors became available for X-rays. Next generation X-ray source, which should be used in conjunction with the multi-layer optics, is discussed in the relation with their characteristics.
